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authorFlorian Fainelli <florian@openwrt.org>2013-01-09 15:17:21 (GMT)
committer Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>2013-01-10 09:56:19 (GMT)
commita8dc90eaaa5e6474beac828558d969b1aafee4af (patch)
treeed22c27193dcc91697f6b8782da9a9abd08d42b1
parentdf3a5fcc8d1c3402289375c92df705e978fab58d (diff)
downloaduClibc-a8dc90eaaa5e6474beac828558d969b1aafee4af.tar.gz
uClibc-a8dc90eaaa5e6474beac828558d969b1aafee4af.tar.bz2
libc: add {get,set,swap,make}context user context manipulation functions
Add the obsolescent SUSv3 family of user context manipulating functions for arm, i386, mips, x86_64. Signed-off-by: Timon ter Braak <timonterbraak@gmail.com> Signed-off-by: Florian Fainelli <florian@openwrt.org> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com> Signed-off-by: Natanael Copa <ncopa@alpinelinux.org> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
-rw-r--r--Rules.mak2
-rw-r--r--extra/Configs/Config.arm1
-rw-r--r--extra/Configs/Config.i3861
-rw-r--r--extra/Configs/Config.in16
-rw-r--r--extra/Configs/Config.mips1
-rw-r--r--extra/Configs/Config.x86_641
-rw-r--r--include/ucontext.h32
-rw-r--r--libc/.gitignore1
-rw-r--r--libc/sysdeps/linux/Makefile.commonarch20
-rw-r--r--libc/sysdeps/linux/arm/Makefile.arch5
-rw-r--r--libc/sysdeps/linux/arm/getcontext.S80
-rw-r--r--libc/sysdeps/linux/arm/makecontext.c73
-rw-r--r--libc/sysdeps/linux/arm/setcontext.S76
-rw-r--r--libc/sysdeps/linux/arm/swapcontext.S63
-rw-r--r--libc/sysdeps/linux/arm/ucontext_i.sym30
-rw-r--r--libc/sysdeps/linux/i386/Makefile.arch4
-rw-r--r--libc/sysdeps/linux/i386/getcontext.S84
-rw-r--r--libc/sysdeps/linux/i386/makecontext.S123
-rw-r--r--libc/sysdeps/linux/i386/setcontext.S96
-rw-r--r--libc/sysdeps/linux/i386/swapcontext.S110
-rw-r--r--libc/sysdeps/linux/i386/ucontext_i.sym30
-rw-r--r--libc/sysdeps/linux/mips/Makefile.arch4
-rw-r--r--libc/sysdeps/linux/mips/getcontext.S148
-rw-r--r--libc/sysdeps/linux/mips/kernel_rt_sigframe.h10
-rw-r--r--libc/sysdeps/linux/mips/makecontext.S188
-rw-r--r--libc/sysdeps/linux/mips/setcontext.S191
-rw-r--r--libc/sysdeps/linux/mips/swapcontext.S211
-rw-r--r--libc/sysdeps/linux/mips/ucontext_i.sym52
-rw-r--r--libc/sysdeps/linux/x86_64/Makefile.arch5
-rw-r--r--libc/sysdeps/linux/x86_64/__start_context.S49
-rw-r--r--libc/sysdeps/linux/x86_64/getcontext.S88
-rw-r--r--libc/sysdeps/linux/x86_64/makecontext.c121
-rw-r--r--libc/sysdeps/linux/x86_64/setcontext.S103
-rw-r--r--libc/sysdeps/linux/x86_64/swapcontext.S121
-rw-r--r--libc/sysdeps/linux/x86_64/ucontext_i.sym37
-rw-r--r--libpthread/nptl/sysdeps/Makefile.commonarch3
-rw-r--r--libpthread/nptl/sysdeps/unix/sysv/linux/Makefile.commonarch2
37 files changed, 2174 insertions, 8 deletions
diff --git a/Rules.mak b/Rules.mak
index 96871e1..8943fbf 100644
--- a/Rules.mak
+++ b/Rules.mak
@@ -813,3 +813,5 @@ SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
endif
LOCAL_INSTALL_PATH := install_dir
+
+PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"
diff --git a/extra/Configs/Config.arm b/extra/Configs/Config.arm
index 0bb2971..dc53643 100644
--- a/extra/Configs/Config.arm
+++ b/extra/Configs/Config.arm
@@ -11,6 +11,7 @@ config FORCE_OPTIONS_FOR_ARCH
bool
default y
select ARCH_ANY_ENDIAN
+ select ARCH_HAS_UCONTEXT
config CONFIG_ARM_EABI
bool "Build for EABI"
diff --git a/extra/Configs/Config.i386 b/extra/Configs/Config.i386
index 288aa5e..92cee3b 100644
--- a/extra/Configs/Config.i386
+++ b/extra/Configs/Config.i386
@@ -12,6 +12,7 @@ config FORCE_OPTIONS_FOR_ARCH
default y
select ARCH_LITTLE_ENDIAN
select ARCH_HAS_MMU
+ select ARCH_HAS_UCONTEXT
choice
prompt "Target x86 Processor Family"
diff --git a/extra/Configs/Config.in b/extra/Configs/Config.in
index 4bb6812..62bcd9b 100644
--- a/extra/Configs/Config.in
+++ b/extra/Configs/Config.in
@@ -261,6 +261,9 @@ config ARCH_HAS_NO_LDSO
bool
select ARCH_HAS_NO_SHARED
+config ARCH_HAS_UCONTEXT
+ bool
+
config HAVE_SHARED
bool "Enable shared libraries"
depends on !ARCH_HAS_NO_SHARED
@@ -678,6 +681,19 @@ config UCLIBC_SUSV3_LEGACY
WARNING! ABI incompatibility.
+config UCLIBC_HAS_CONTEXT_FUNCS
+ bool "Use obsolescent context control functions"
+ depends on UCLIBC_SUSV3_LEGACY && ARCH_HAS_UCONTEXT
+ help
+ Add into library the SuSv3 obsolescent functions used for context
+ control. The setcontext family allows the implementation in C of
+ advanced control flow patterns such as iterators, fibers, and
+ coroutines. They may be viewed as an advanced version of
+ setjmp/longjmp; whereas the latter allows only a single non-local jump
+ up the stack, setcontext allows the creation of multiple cooperative
+ threads of control, each with its own stack.
+ These functions are: setcontext, getcontext, makecontext, swapcontext.
+
config UCLIBC_SUSV3_LEGACY_MACROS
bool "Enable SuSv3 LEGACY macros"
help
diff --git a/extra/Configs/Config.mips b/extra/Configs/Config.mips
index 063b07c..48e0b64 100644
--- a/extra/Configs/Config.mips
+++ b/extra/Configs/Config.mips
@@ -11,6 +11,7 @@ config FORCE_OPTIONS_FOR_ARCH
bool
default y
select ARCH_ANY_ENDIAN
+ select ARCH_HAS_UCONTEXT
choice
prompt "Target ABI"
diff --git a/extra/Configs/Config.x86_64 b/extra/Configs/Config.x86_64
index 1b28088..4c8c3a9 100644
--- a/extra/Configs/Config.x86_64
+++ b/extra/Configs/Config.x86_64
@@ -12,3 +12,4 @@ config FORCE_OPTIONS_FOR_ARCH
default y
select ARCH_LITTLE_ENDIAN
select ARCH_HAS_MMU
+ select ARCH_HAS_UCONTEXT
diff --git a/include/ucontext.h b/include/ucontext.h
index 14a1270..f11db77 100644
--- a/include/ucontext.h
+++ b/include/ucontext.h
@@ -15,17 +15,43 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
+/* The System V ABI user-level context switching support functions
+ are marked obsolescent by SuSv3. */
+
#ifndef _UCONTEXT_H
#define _UCONTEXT_H 1
#include <features.h>
+#ifdef __UCLIBC_HAS_CONTEXT_FUNCS__
+
/* Get machine dependent definition of data structures. */
#include <sys/ucontext.h>
-/* The System V ABI user-level context switching support functions
- * are marked obsolescent by SuSv3, and are not implemented by
- * uClibc. This header is therefore empty. */
+__BEGIN_DECLS
+
+/* Get user context and store it in variable pointed to by UCP. */
+extern int getcontext (ucontext_t *__ucp) __THROW;
+
+/* Set user context from information of variable pointed to by UCP. */
+extern int setcontext (const ucontext_t *__ucp) __THROW;
+
+/* Save current context in context variable pointed to by OUCP and set
+ context from variable pointed to by UCP. */
+extern int swapcontext (ucontext_t *__restrict __oucp,
+ const ucontext_t *__restrict __ucp) __THROW;
+
+/* Manipulate user context UCP to continue with calling functions FUNC
+ and the ARGC-1 parameters following ARGC when the context is used
+ the next time in `setcontext' or `swapcontext'.
+
+ We cannot say anything about the parameters FUNC takes; `void'
+ is as good as any other choice. */
+extern void makecontext (ucontext_t *__ucp, void (*__func) (void),
+ int __argc, ...) __THROW;
+
+__END_DECLS
+#endif
#endif /* ucontext.h */
diff --git a/libc/.gitignore b/libc/.gitignore
new file mode 100644
index 0000000..f4c0305
--- /dev/null
+++ b/libc/.gitignore
@@ -0,0 +1 @@
+ucontext_i.[chs]
diff --git a/libc/sysdeps/linux/Makefile.commonarch b/libc/sysdeps/linux/Makefile.commonarch
index c1bc5df..ac89e72 100644
--- a/libc/sysdeps/linux/Makefile.commonarch
+++ b/libc/sysdeps/linux/Makefile.commonarch
@@ -37,5 +37,23 @@ headers-y += $(ARCH_HEADERS_OUT)
headers_clean-y += HEADERCLEAN_$(subst $(top_builddir),,$(ARCH_OUT))
HEADERCLEAN_$(subst $(top_builddir),,$(ARCH_OUT)):
$(do_rm) $(ARCH_HEADERS_OUT)
-
endif
+
+CFLAGS-ucontext_i.c = -S
+
+$(ARCH_OUT)/ucontext_i.c: $(ARCH_DIR)/ucontext_i.sym
+ $(do_awk) $(top_srcdir)extra/scripts/gen-as-const.awk $< > $@
+
+$(ARCH_OUT)/ucontext_i.s: $(ARCH_OUT)/ucontext_i.c
+ $(compile.c)
+
+$(ARCH_OUT)/ucontext_i.h: $(ARCH_OUT)/ucontext_i.s
+ $(do_sed) $(PTHREAD_GENERATE_MANGLE) $< > $@
+
+pregen-headers-$(UCLIBC_HAS_CONTEXT_FUNCS) += $(ARCH_OUT)/ucontext_i.h
+
+headers_clean-$(UCLIBC_HAS_CONTEXT_FUNCS) += \
+ HEADERCLEAN_$(subst $(top_builddir),,$(ARCH_OUT)/ucontext_i)
+
+HEADERCLEAN_$(subst $(top_builddir),,$(ARCH_OUT)/ucontext_i):
+ $(do_rm) $(addprefix $(ARCH_OUT)/ucontext_i., c h s)
diff --git a/libc/sysdeps/linux/arm/Makefile.arch b/libc/sysdeps/linux/arm/Makefile.arch
index 5fc3e54..36d988b 100644
--- a/libc/sysdeps/linux/arm/Makefile.arch
+++ b/libc/sysdeps/linux/arm/Makefile.arch
@@ -43,3 +43,8 @@ libc-static-y += $(ARCH_OUT)/aeabi_lcsts.o $(ARCH_OUT)/aeabi_math.o \
libc-nonshared-y += $(ARCH_OUT)/aeabi_lcsts.os $(ARCH_OUT)/aeabi_math.os \
$(ARCH_OUT)/aeabi_sighandlers.os $(ARCH_OUT)/aeabi_unwind_cpp_pr1.o
endif
+
+ifeq ($(UCLIBC_HAS_CONTEXT_FUNCS),y)
+CSRC += makecontext.c
+SSRC += getcontext.S setcontext.S swapcontext.S
+endif
diff --git a/libc/sysdeps/linux/arm/getcontext.S b/libc/sysdeps/linux/arm/getcontext.S
new file mode 100644
index 0000000..a987c52
--- /dev/null
+++ b/libc/sysdeps/linux/arm/getcontext.S
@@ -0,0 +1,80 @@
+/* Copyright (C) 2012 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+
+#include "ucontext_i.h"
+
+ .syntax unified
+ .text
+
+/* int getcontext (ucontext_t *ucp) */
+
+ENTRY(__getcontext)
+ /* No need to save r0-r3, d0-d7, or d16-d31. */
+ add r1, r0, #MCONTEXT_ARM_R4
+ stmia r1, {r4-r11}
+
+ /* Save R13 separately as Thumb can't STM it. */
+ str r13, [r0, #MCONTEXT_ARM_SP]
+ str r14, [r0, #MCONTEXT_ARM_LR]
+ /* Return to LR */
+ str r14, [r0, #MCONTEXT_ARM_PC]
+ /* Return zero */
+ mov r2, #0
+ str r2, [r0, #MCONTEXT_ARM_R0]
+
+ /* Save ucontext_t * across the next call. */
+ mov r4, r0
+
+ /* __sigprocmask(SIG_BLOCK, NULL, &(ucontext->uc_sigmask)) */
+ mov r0, #SIG_BLOCK
+ mov r1, #0
+ add r2, r4, #UCONTEXT_SIGMASK
+ bl PLTJMP(sigprocmask)
+
+#if defined __UCLIBC_HAS_FLOATS__ && ! defined __UCLIBC_HAS_SOFT_FLOAT__
+# ifdef __VFP_FP__
+ /* Store the VFP registers. */
+ /* Following instruction is fstmiax ip!, {d8-d15}. */
+ stc p11, cr8, [r0], #64
+ /* Store the floating-point status register. */
+ /* Following instruction is fmrx r2, fpscr. */
+ mrc p10, 7, r1, cr1, cr0, 0
+ str r1, [r0], #4
+# endif
+#endif
+#ifdef __IWMMXT__
+ /* Save the call-preserved iWMMXt registers. */
+ /* Following instructions are wstrd wr10, [r0], #8 (etc.) */
+ stcl p1, cr10, [r0], #8
+ stcl p1, cr11, [r0], #8
+ stcl p1, cr12, [r0], #8
+ stcl p1, cr13, [r0], #8
+ stcl p1, cr14, [r0], #8
+ stcl p1, cr15, [r0], #8
+#endif
+
+ /* Restore the clobbered R4 and LR. */
+ ldr r14, [r4, #MCONTEXT_ARM_LR]
+ ldr r4, [r4, #MCONTEXT_ARM_R4]
+
+ mov r0, #0
+ DO_RET(r14)
+
+END(__getcontext)
+weak_alias(__getcontext, getcontext)
diff --git a/libc/sysdeps/linux/arm/makecontext.c b/libc/sysdeps/linux/arm/makecontext.c
new file mode 100644
index 0000000..d6ae6f0
--- /dev/null
+++ b/libc/sysdeps/linux/arm/makecontext.c
@@ -0,0 +1,73 @@
+/* Copyright (C) 2012 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <stdarg.h>
+#include <ucontext.h>
+
+/* Number of arguments that go in registers. */
+#define NREG_ARGS 4
+
+/* Take a context previously prepared via getcontext() and set to
+ call func() with the given int only args. */
+void
+__makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
+{
+ extern void __startcontext (void);
+ unsigned long *funcstack;
+ va_list vl;
+ unsigned long *regptr;
+ unsigned int reg;
+ int misaligned;
+
+ /* Start at the top of stack. */
+ funcstack = (unsigned long *) (ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size);
+
+ /* Ensure the stack stays eight byte aligned. */
+ misaligned = ((unsigned long) funcstack & 4) != 0;
+
+ if ((argc > NREG_ARGS) && (argc & 1) != 0)
+ misaligned = !misaligned;
+
+ if (misaligned)
+ funcstack -= 1;
+
+ va_start (vl, argc);
+
+ /* Reserve space for the on-stack arguments. */
+ if (argc > NREG_ARGS)
+ funcstack -= (argc - NREG_ARGS);
+
+ ucp->uc_mcontext.arm_sp = (unsigned long) funcstack;
+ ucp->uc_mcontext.arm_pc = (unsigned long) func;
+
+ /* Exit to startcontext() with the next context in R4 */
+ ucp->uc_mcontext.arm_r4 = (unsigned long) ucp->uc_link;
+ ucp->uc_mcontext.arm_lr = (unsigned long) __startcontext;
+
+ /* The first four arguments go into registers. */
+ regptr = &(ucp->uc_mcontext.arm_r0);
+
+ for (reg = 0; (reg < argc) && (reg < NREG_ARGS); reg++)
+ *regptr++ = va_arg (vl, unsigned long);
+
+ /* And the remainder on the stack. */
+ for (; reg < argc; reg++)
+ *funcstack++ = va_arg (vl, unsigned long);
+
+ va_end (vl);
+}
+weak_alias (__makecontext, makecontext)
diff --git a/libc/sysdeps/linux/arm/setcontext.S b/libc/sysdeps/linux/arm/setcontext.S
new file mode 100644
index 0000000..a5c33a0
--- /dev/null
+++ b/libc/sysdeps/linux/arm/setcontext.S
@@ -0,0 +1,76 @@
+/* Copyright (C) 2012 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+
+#include "ucontext_i.h"
+
+ .syntax unified
+ .text
+
+/* int setcontext (const ucontext_t *ucp) */
+
+ENTRY(__setcontext)
+ mov r4, r0
+
+#if defined __UCLIBC_HAS_FLOATS__ && ! defined __UCLIBC_HAS_SOFT_FLOAT__
+# ifdef __VFP_FP__
+ /* Following instruction is vldmia r0!, {d8-d15}. */
+ ldc p11, cr8, [r0], #64
+ /* Restore the floating-point status register. */
+ ldr r1, [r0], #4
+ /* Following instruction is fmxr fpscr, r1. */
+ mcr p10, 7, r1, cr1, cr0, 0
+# endif
+#endif
+
+#ifdef __IWMMXT__
+ /* Restore the call-preserved iWMMXt registers. */
+ /* Following instructions are wldrd wr10, [r0], #8 (etc.) */
+ ldcl p1, cr10, [r0], #8
+ ldcl p1, cr11, [r0], #8
+ ldcl p1, cr12, [r0], #8
+ ldcl p1, cr13, [r0], #8
+ ldcl p1, cr14, [r0], #8
+ ldcl p1, cr15, [r0], #8
+#endif
+
+ /* Now bring back the signal status. */
+ mov r0, #SIG_SETMASK
+ add r1, r4, #UCONTEXT_SIGMASK
+ mov r2, #0
+ bl PLTJMP(sigprocmask)
+
+ /* Loading r0-r3 makes makecontext easier. */
+ add r14, r4, #MCONTEXT_ARM_R0
+ ldmia r14, {r0-r11}
+ ldr r13, [r14, #(MCONTEXT_ARM_SP - MCONTEXT_ARM_R0)]
+ add r14, r14, #(MCONTEXT_ARM_LR - MCONTEXT_ARM_R0)
+ ldmia r14, {r14, pc}
+
+END(setcontext)
+weak_alias(__setcontext, setcontext)
+
+ /* Called when a makecontext() context returns. Start the
+ context in R4 or fall through to exit(). */
+ENTRY(__startcontext)
+ movs r0, r4
+ bne PLTJMP(__setcontext)
+
+ @ New context was 0 - exit
+ b PLTJMP(_exit)
+END(__startcontext)
diff --git a/libc/sysdeps/linux/arm/swapcontext.S b/libc/sysdeps/linux/arm/swapcontext.S
new file mode 100644
index 0000000..ba6e31c
--- /dev/null
+++ b/libc/sysdeps/linux/arm/swapcontext.S
@@ -0,0 +1,63 @@
+/* Copyright (C) 2012 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+
+#include "ucontext_i.h"
+
+ .syntax unified
+ .text
+
+/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */
+
+ENTRY(swapcontext)
+
+ /* Have getcontext() do most of the work then fix up
+ LR afterwards. Save R3 to keep the stack aligned. */
+ push {r0,r1,r3,r14}
+ cfi_adjust_cfa_offset (16)
+ cfi_rel_offset (r0,0)
+ cfi_rel_offset (r1,4)
+ cfi_rel_offset (r3,8)
+ cfi_rel_offset (r14,12)
+
+ bl __getcontext
+ mov r4, r0
+
+ pop {r0,r1,r3,r14}
+ cfi_adjust_cfa_offset (-16)
+ cfi_restore (r0)
+ cfi_restore (r1)
+ cfi_restore (r3)
+ cfi_restore (r14)
+
+ /* Exit if getcontext() failed. */
+ cmp r4, #0
+ itt ne
+ movne r0, r4
+ RETINSTR(ne, r14)
+
+ /* Fix up LR and the PC. */
+ str r13,[r0, #MCONTEXT_ARM_SP]
+ str r14,[r0, #MCONTEXT_ARM_LR]
+ str r14,[r0, #MCONTEXT_ARM_PC]
+
+ /* And swap using swapcontext(). */
+ mov r0, r1
+ b __setcontext
+
+END(swapcontext)
diff --git a/libc/sysdeps/linux/arm/ucontext_i.sym b/libc/sysdeps/linux/arm/ucontext_i.sym
new file mode 100644
index 0000000..9650322
--- /dev/null
+++ b/libc/sysdeps/linux/arm/ucontext_i.sym
@@ -0,0 +1,30 @@
+#include <inttypes.h>
+#include <signal.h>
+#include <stddef.h>
+#include <sys/ucontext.h>
+
+SIG_BLOCK
+SIG_SETMASK
+
+-- Offsets of the fields in the ucontext_t structure.
+#define ucontext(member) offsetof (ucontext_t, member)
+#define mcontext(member) ucontext (uc_mcontext.member)
+
+UCONTEXT_FLAGS ucontext (uc_flags)
+UCONTEXT_LINK ucontext (uc_link)
+UCONTEXT_STACK ucontext (uc_stack)
+UCONTEXT_MCONTEXT ucontext (uc_mcontext)
+UCONTEXT_SIGMASK ucontext (uc_sigmask)
+
+UCONTEXT_REGSPACE ucontext (uc_regspace)
+
+MCONTEXT_TRAP_NO mcontext (trap_no)
+MCONTEXT_ERROR_CODE mcontext (error_code)
+MCONTEXT_OLDMASK mcontext (oldmask)
+MCONTEXT_ARM_R0 mcontext (arm_r0)
+MCONTEXT_ARM_R4 mcontext (arm_r4)
+MCONTEXT_ARM_SP mcontext (arm_sp)
+MCONTEXT_ARM_LR mcontext (arm_lr)
+MCONTEXT_ARM_PC mcontext (arm_pc)
+MCONTEXT_ARM_CPSR mcontext (arm_cpsr)
+MCONTEXT_FAULT_ADDRESS mcontext (fault_address)
diff --git a/libc/sysdeps/linux/i386/Makefile.arch b/libc/sysdeps/linux/i386/Makefile.arch
index a3bf32f..e7fd28e 100644
--- a/libc/sysdeps/linux/i386/Makefile.arch
+++ b/libc/sysdeps/linux/i386/Makefile.arch
@@ -18,3 +18,7 @@ endif
ifneq ($(UCLIBC_HAS_THREADS_NATIVE),y)
SSRC += vfork.S clone.S
endif
+
+ifeq ($(UCLIBC_HAS_CONTEXT_FUNCS),y)
+SSRC += makecontext.S setcontext.S getcontext.S swapcontext.S
+endif
diff --git a/libc/sysdeps/linux/i386/getcontext.S b/libc/sysdeps/linux/i386/getcontext.S
new file mode 100644
index 0000000..3221b59
--- /dev/null
+++ b/libc/sysdeps/linux/i386/getcontext.S
@@ -0,0 +1,84 @@
+/* Save current context.
+ Copyright (C) 2001-2012 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+
+#include "ucontext_i.h"
+
+
+ENTRY(__getcontext)
+ /* Load address of the context data structure. */
+ movl 4(%esp), %eax
+
+ /* Return value of getcontext. EAX is the only register whose
+ value is not preserved. */
+ movl $0, oEAX(%eax)
+
+ /* Save the 32-bit register values and the return address. */
+ movl %ecx, oECX(%eax)
+ movl %edx, oEDX(%eax)
+ movl %edi, oEDI(%eax)
+ movl %esi, oESI(%eax)
+ movl %ebp, oEBP(%eax)
+ movl (%esp), %ecx
+ movl %ecx, oEIP(%eax)
+ leal 4(%esp), %ecx /* Exclude the return address. */
+ movl %ecx, oESP(%eax)
+ movl %ebx, oEBX(%eax)
+
+ /* Save the FS segment register. We don't touch the GS register
+ since it is used for threads. */
+ xorl %edx, %edx
+ movw %fs, %dx
+ movl %edx, oFS(%eax)
+
+ /* We have separate floating-point register content memory on the
+ stack. We use the __fpregs_mem block in the context. Set the
+ links up correctly. */
+ leal oFPREGSMEM(%eax), %ecx
+ movl %ecx, oFPREGS(%eax)
+ /* Save the floating-point context. */
+ fnstenv (%ecx)
+ /* And load it right back since the processor changes the mask.
+ Intel thought this opcode to be used in interrupt handlers which
+ would block all exceptions. */
+ fldenv (%ecx)
+
+ /* Save the current signal mask. */
+ pushl %ebx
+ cfi_adjust_cfa_offset (4)
+ cfi_rel_offset (ebx, 0)
+ leal oSIGMASK(%eax), %edx
+ xorl %ecx, %ecx
+ movl $SIG_BLOCK, %ebx
+ movl $__NR_sigprocmask, %eax
+ ENTER_KERNEL
+ popl %ebx
+ cfi_adjust_cfa_offset (-4)
+ cfi_restore (ebx)
+ cmpl $-4095, %eax /* Check %eax for error. */
+ jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */
+
+ /* All done, return 0 for success. */
+ xorl %eax, %eax
+L(pseudo_end):
+ ret
+PSEUDO_END(__getcontext)
+
+weak_alias (__getcontext, getcontext)
diff --git a/libc/sysdeps/linux/i386/makecontext.S b/libc/sysdeps/linux/i386/makecontext.S
new file mode 100644
index 0000000..d12799d
--- /dev/null
+++ b/libc/sysdeps/linux/i386/makecontext.S
@@ -0,0 +1,123 @@
+/* Create new context.
+ Copyright (C) 2001,2002,2005,2007,2008,2009 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+
+#include "ucontext_i.h"
+
+
+ENTRY(__makecontext)
+ movl 4(%esp), %eax
+
+ /* Load the address of the function we are supposed to run. */
+ movl 8(%esp), %ecx
+
+ /* Compute the address of the stack. The information comes from
+ to us_stack element. */
+ movl oSS_SP(%eax), %edx
+ movl %ecx, oEIP(%eax)
+ addl oSS_SIZE(%eax), %edx
+
+ /* Remember the number of parameters for the exit handler since
+ it has to remove them. We store the number in the EBX register
+ which the function we will call must preserve. */
+ movl 12(%esp), %ecx
+ movl %ecx, oEBX(%eax)
+
+ /* Make room on the new stack for the parameters.
+ Room for the arguments, return address (== L(exitcode)) and
+ oLINK pointer is needed. One of the pointer sizes is subtracted
+ after aligning the stack. */
+ negl %ecx
+ leal -4(%edx,%ecx,4), %edx
+ negl %ecx
+
+ /* Align the stack. */
+ andl $0xfffffff0, %edx
+ subl $4, %edx
+
+ /* Store the future stack pointer. */
+ movl %edx, oESP(%eax)
+
+ /* Put the next context on the new stack (from the uc_link
+ element). */
+ movl oLINK(%eax), %eax
+ movl %eax, 4(%edx,%ecx,4)
+
+ /* Copy all the parameters. */
+ jecxz 2f
+1: movl 12(%esp,%ecx,4), %eax
+ movl %eax, (%edx,%ecx,4)
+ decl %ecx
+ jnz 1b
+2:
+
+ /* If the function we call returns we must continue with the
+ context which is given in the uc_link element. To do this
+ set the return address for the function the user provides
+ to a little bit of helper code which does the magic (see
+ below). */
+#ifdef __PIC__
+ call 1f
+ cfi_adjust_cfa_offset (4)
+1: popl %ecx
+ cfi_adjust_cfa_offset (-4)
+ addl $L(exitcode)-1b, %ecx
+ movl %ecx, (%edx)
+#else
+ movl $L(exitcode), (%edx)
+#endif
+ /* 'makecontext' returns no value. */
+L(pseudo_end):
+ ret
+
+ /* This is the helper code which gets called if a function which
+ is registered with 'makecontext' returns. In this case we
+ have to install the context listed in the uc_link element of
+ the context 'makecontext' manipulated at the time of the
+ 'makecontext' call. If the pointer is NULL the process must
+ terminate. */
+ cfi_endproc
+L(exitcode):
+ /* This removes the parameters passed to the function given to
+ 'makecontext' from the stack. EBX contains the number of
+ parameters (see above). */
+ leal (%esp,%ebx,4), %esp
+
+#ifdef __PIC__
+ call 1f
+1: popl %ebx
+ addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %ebx
+#endif
+ cmpl $0, (%esp) /* Check the next context. */
+ je 2f /* If it is zero exit. */
+
+ call JUMPTARGET(__setcontext)
+ /* If this returns (which can happen if the syscall fails) we'll
+ exit the program with the return error value (-1). */
+
+ movl %eax, (%esp)
+2: call HIDDEN_JUMPTARGET(exit)
+ /* The 'exit' call should never return. In case it does cause
+ the process to terminate. */
+ hlt
+ cfi_startproc
+END(__makecontext)
+
+weak_alias (__makecontext, makecontext)
diff --git a/libc/sysdeps/linux/i386/setcontext.S b/libc/sysdeps/linux/i386/setcontext.S
new file mode 100644
index 0000000..ae953cc
--- /dev/null
+++ b/libc/sysdeps/linux/i386/setcontext.S
@@ -0,0 +1,96 @@
+/* Install given context.
+ Copyright (C) 2001-2012 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+
+#include "ucontext_i.h"
+
+
+ENTRY(__setcontext)
+ /* Load address of the context data structure. */
+ movl 4(%esp), %eax
+
+ /* Get the current signal mask. Note that we preserve EBX in case
+ the system call fails and we return from the function with an
+ error. */
+ pushl %ebx
+ cfi_adjust_cfa_offset (4)
+ xorl %edx, %edx
+ leal oSIGMASK(%eax), %ecx
+ movl $SIG_SETMASK, %ebx
+ cfi_rel_offset (ebx, 0)
+ movl $__NR_sigprocmask, %eax
+ ENTER_KERNEL
+ popl %ebx
+ cfi_adjust_cfa_offset (-4)
+ cfi_restore (ebx)
+ cmpl $-4095, %eax /* Check %eax for error. */
+ jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */
+
+ /* EAX was modified, reload it. */
+ movl 4(%esp), %eax
+
+ /* Restore the floating-point context. Not the registers, only the
+ rest. */
+ movl oFPREGS(%eax), %ecx
+ fldenv (%ecx)
+
+ /* Restore the FS segment register. We don't touch the GS register
+ since it is used for threads. */
+ movl oFS(%eax), %ecx
+ movw %cx, %fs
+
+ /* Fetch the address to return to. */
+ movl oEIP(%eax), %ecx
+
+ /* Load the new stack pointer. */
+ cfi_def_cfa (eax, 0)
+ cfi_offset (edi, oEDI)
+ cfi_offset (esi, oESI)
+ cfi_offset (ebp, oEBP)
+ cfi_offset (ebx, oEBX)
+ cfi_offset (edx, oEDX)
+ cfi_offset (ecx, oECX)
+ movl oESP(%eax), %esp
+
+ /* Push the return address on the new stack so we can return there. */
+ pushl %ecx
+
+ /* Load the values of all the 32-bit registers (except ESP).
+ Since we are loading from EAX, it must be last. */
+ movl oEDI(%eax), %edi
+ movl oESI(%eax), %esi
+ movl oEBP(%eax), %ebp
+ movl oEBX(%eax), %ebx
+ movl oEDX(%eax), %edx
+ movl oECX(%eax), %ecx
+ movl oEAX(%eax), %eax
+
+ /* End FDE here, we fall into another context. */
+ cfi_endproc
+ cfi_startproc
+
+ /* The following 'ret' will pop the address of the code and jump
+ to it. */
+
+L(pseudo_end):
+ ret
+PSEUDO_END(__setcontext)
+
+weak_alias (__setcontext, setcontext)
diff --git a/libc/sysdeps/linux/i386/swapcontext.S b/libc/sysdeps/linux/i386/swapcontext.S
new file mode 100644
index 0000000..ee5d0e4
--- /dev/null
+++ b/libc/sysdeps/linux/i386/swapcontext.S
@@ -0,0 +1,110 @@
+/* Save current context and install the given one.
+ Copyright (C) 2001-2012 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+
+#include "ucontext_i.h"
+
+
+ENTRY(__swapcontext)
+ /* Load address of the context data structure we save in. */
+ movl 4(%esp), %eax
+
+ /* Return value of swapcontext. EAX is the only register whose
+ value is not preserved. */
+ movl $0, oEAX(%eax)
+
+ /* Save the 32-bit register values and the return address. */
+ movl %ecx, oECX(%eax)
+ movl %edx, oEDX(%eax)
+ movl %edi, oEDI(%eax)
+ movl %esi, oESI(%eax)
+ movl %ebp, oEBP(%eax)
+ movl (%esp), %ecx
+ movl %ecx, oEIP(%eax)
+ leal 4(%esp), %ecx
+ movl %ecx, oESP(%eax)
+ movl %ebx, oEBX(%eax)
+
+ /* Save the FS segment register. */
+ xorl %edx, %edx
+ movw %fs, %dx
+ movl %edx, oFS(%eax)
+
+ /* We have separate floating-point register content memory on the
+ stack. We use the __fpregs_mem block in the context. Set the
+ links up correctly. */
+ leal oFPREGSMEM(%eax), %ecx
+ movl %ecx, oFPREGS(%eax)
+ /* Save the floating-point context. */
+ fnstenv (%ecx)
+
+ /* Load address of the context data structure we have to load. */
+ movl 8(%esp), %ecx
+
+ /* Save the current signal mask and install the new one. */
+ pushl %ebx
+ leal oSIGMASK(%eax), %edx
+ leal oSIGMASK(%ecx), %ecx
+ movl $SIG_SETMASK, %ebx
+ movl $__NR_sigprocmask, %eax
+ ENTER_KERNEL
+ popl %ebx
+ cmpl $-4095, %eax /* Check %eax for error. */
+ jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */
+
+ /* EAX was modified, reload it. */
+ movl 8(%esp), %eax
+
+ /* Restore the floating-point context. Not the registers, only the
+ rest. */
+ movl oFPREGS(%eax), %ecx
+ fldenv (%ecx)
+
+ /* Restore the FS segment register. We don't touch the GS register
+ since it is used for threads. */
+ movl oFS(%eax), %edx
+ movw %dx, %fs
+
+ /* Fetch the address to return to. */
+ movl oEIP(%eax), %ecx
+
+ /* Load the new stack pointer. */
+ movl oESP(%eax), %esp
+
+ /* Push the return address on the new stack so we can return there. */
+ pushl %ecx
+
+ /* Load the values of all the 32-bit registers (except ESP).
+ Since we are loading from EAX, it must be last. */
+ movl oEDI(%eax), %edi
+ movl oESI(%eax), %esi
+ movl oEBP(%eax), %ebp
+ movl oEBX(%eax), %ebx
+ movl oEDX(%eax), %edx
+ movl oECX(%eax), %ecx
+ movl oEAX(%eax), %eax
+
+ /* The following 'ret' will pop the address of the code and jump
+ to it. */
+L(pseudo_end):
+ ret
+PSEUDO_END(__swapcontext)
+
+weak_alias (__swapcontext, swapcontext)
diff --git a/libc/sysdeps/linux/i386/ucontext_i.sym b/libc/sysdeps/linux/i386/ucontext_i.sym
new file mode 100644
index 0000000..b11a550
--- /dev/null
+++ b/libc/sysdeps/linux/i386/ucontext_i.sym
@@ -0,0 +1,30 @@
+#include <stddef.h>
+#include <signal.h>
+#include <sys/ucontext.h>
+
+--
+
+SIG_BLOCK
+SIG_SETMASK
+
+#define ucontext(member) offsetof (ucontext_t, member)
+#define mcontext(member) ucontext (uc_mcontext.member)
+#define mreg(reg) mcontext (gregs[REG_##reg])
+
+oLINK ucontext (uc_link)
+oSS_SP ucontext (uc_stack.ss_sp)
+oSS_SIZE ucontext (uc_stack.ss_size)
+oGS mreg (GS)
+oFS mreg (FS)
+oEDI mreg (EDI)
+oESI mreg (ESI)
+oEBP mreg (EBP)
+oESP mreg (ESP)
+oEBX mreg (EBX)
+oEDX mreg (EDX)
+oECX mreg (ECX)
+oEAX mreg (EAX)
+oEIP mreg (EIP)
+oFPREGS mcontext (fpregs)
+oSIGMASK ucontext (uc_sigmask)
+oFPREGSMEM ucontext (__fpregs_mem)
diff --git a/libc/sysdeps/linux/mips/Makefile.arch b/libc/sysdeps/linux/mips/Makefile.arch
index fce99f8..00b9331 100644
--- a/libc/sysdeps/linux/mips/Makefile.arch
+++ b/libc/sysdeps/linux/mips/Makefile.arch
@@ -27,3 +27,7 @@ ASFLAGS-syscall_error.S += -D_LIBC_REENTRANT
ARCH_HEADERS := sgidefs.h
# regdef.h
+
+ifeq ($(UCLIBC_HAS_CONTEXT_FUNCS),y)
+SSRC += makecontext.S setcontext.S getcontext.S swapcontext.S
+endif
diff --git a/libc/sysdeps/linux/mips/getcontext.S b/libc/sysdeps/linux/mips/getcontext.S
new file mode 100644
index 0000000..c4ad081
--- /dev/null
+++ b/libc/sysdeps/linux/mips/getcontext.S
@@ -0,0 +1,148 @@
+/* Save current context.
+ Copyright (C) 2009 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Maciej W. Rozycki <macro@codesourcery.com>.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+#include <sys/asm.h>
+#include <sys/fpregdef.h>
+#include <sys/regdef.h>
+
+#include "ucontext_i.h"
+
+/* int getcontext (ucontext_t *ucp) */
+
+ .text
+LOCALSZ = 0
+MASK = 0x00000000
+#ifdef __PIC__
+LOCALSZ = 1 /* save gp */
+# if _MIPS_SIM != _ABIO32
+MASK = 0x10000000
+# endif
+#endif
+FRAMESZ = ((LOCALSZ * SZREG) + ALSZ) & ALMASK
+GPOFF = FRAMESZ - (1 * SZREG)
+
+NESTED (__getcontext, FRAMESZ, ra)
+ .mask MASK, 0
+ .fmask 0x00000000, 0
+
+#ifdef __PIC__
+ SETUP_GP
+
+ move a2, sp
+# define _SP a2
+
+# if _MIPS_SIM != _ABIO32
+ move a3, gp
+# define _GP a3
+# endif
+
+ PTR_ADDIU sp, -FRAMESZ
+ SETUP_GP64 (GPOFF, __getcontext)
+ SAVE_GP (GPOFF)
+
+#else /* ! __PIC__ */
+# define _SP sp
+# define _GP gp
+
+#endif /* ! __PIC__ */
+
+#ifdef PROF
+ .set noat
+ move AT, ra
+ jal _mcount
+ .set at
+#endif
+
+ /* Store a magic flag. */
+ li v1, 1
+ REG_S v1, (0 * SZREG + MCONTEXT_GREGS)(a0) /* zero */
+
+ REG_S s0, (16 * SZREG + MCONTEXT_GREGS)(a0)
+ REG_S s1, (17 * SZREG + MCONTEXT_GREGS)(a0)
+ REG_S s2, (18 * SZREG + MCONTEXT_GREGS)(a0)
+ REG_S s3, (19 * SZREG + MCONTEXT_GREGS)(a0)
+ REG_S s4, (20 * SZREG + MCONTEXT_GREGS)(a0)
+ REG_S s5, (21 * SZREG + MCONTEXT_GREGS)(a0)
+ REG_S s6, (22 * SZREG + MCONTEXT_GREGS)(a0)
+ REG_S s7, (23 * SZREG + MCONTEXT_GREGS)(a0)
+#if ! defined (__PIC__) || _MIPS_SIM != _ABIO32
+ REG_S _GP, (28 * SZREG + MCONTEXT_GREGS)(a0)
+#endif
+ REG_S _SP, (29 * SZREG + MCONTEXT_GREGS)(a0)
+ REG_S fp, (30 * SZREG + MCONTEXT_GREGS)(a0)
+ REG_S ra, (31 * SZREG + MCONTEXT_GREGS)(a0)
+ REG_S ra, MCONTEXT_PC(a0)
+
+#ifdef __mips_hard_float
+# if _MIPS_SIM == _ABI64
+ s.d fs0, (24 * SZREG + MCONTEXT_FPREGS)(a0)
+ s.d fs1, (25 * SZREG + MCONTEXT_FPREGS)(a0)
+ s.d fs2, (26 * SZREG + MCONTEXT_FPREGS)(a0)
+ s.d fs3, (27 * SZREG + MCONTEXT_FPREGS)(a0)
+ s.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(a0)
+ s.d fs5, (29 * SZREG + MCONTEXT_FPREGS)(a0)
+ s.d fs6, (30 * SZREG + MCONTEXT_FPREGS)(a0)
+ s.d fs7, (31 * SZREG + MCONTEXT_FPREGS)(a0)
+
+# else /* _MIPS_SIM != _ABI64 */
+ s.d fs0, (20 * SZREG + MCONTEXT_FPREGS)(a0)
+ s.d fs1, (22 * SZREG + MCONTEXT_FPREGS)(a0)
+ s.d fs2, (24 * SZREG + MCONTEXT_FPREGS)(a0)
+ s.d fs3, (26 * SZREG + MCONTEXT_FPREGS)(a0)
+ s.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(a0)
+ s.d fs5, (30 * SZREG + MCONTEXT_FPREGS)(a0)
+
+# endif /* _MIPS_SIM != _ABI64 */
+
+ cfc1 v1, fcr31
+ sw v1, MCONTEXT_FPC_CSR(a0)
+#endif /* __mips_hard_float */
+
+/* rt_sigprocmask (SIG_BLOCK, NULL, &ucp->uc_sigmask, _NSIG8) */
+ li a3, _NSIG8
+ PTR_ADDU a2, a0, UCONTEXT_SIGMASK
+ move a1, zero
+ li a0, SIG_BLOCK
+
+ li v0, SYS_ify (rt_sigprocmask)
+ syscall
+ bnez a3, 99f
+
+#ifdef __PIC__
+ RESTORE_GP64
+ PTR_ADDIU sp, FRAMESZ
+#endif
+ move v0, zero
+ jr ra
+
+99:
+#ifdef __PIC__
+ PTR_LA t9, JUMPTARGET (__syscall_error)
+ RESTORE_GP64
+ PTR_ADDIU sp, FRAMESZ
+ jr t9
+
+#else /* ! __PIC__ */
+
+ j JUMPTARGET (__syscall_error)
+#endif /* ! __PIC__ */
+PSEUDO_END (__getcontext)
+
+weak_alias (__getcontext, getcontext)
diff --git a/libc/sysdeps/linux/mips/kernel_rt_sigframe.h b/libc/sysdeps/linux/mips/kernel_rt_sigframe.h
new file mode 100644
index 0000000..77ffaf6
--- /dev/null
+++ b/libc/sysdeps/linux/mips/kernel_rt_sigframe.h
@@ -0,0 +1,10 @@
+/* Linux kernel RT signal frame. */
+typedef struct kernel_rt_sigframe
+ {
+ uint32_t rs_ass[4];
+ uint32_t rs_code[2];
+ siginfo_t rs_info;
+ struct ucontext rs_uc;
+ uint32_t rs_altcode[8] __attribute__ ((__aligned__ (1 << 7)));
+ }
+kernel_rt_sigframe_t;
diff --git a/libc/sysdeps/linux/mips/makecontext.S b/libc/sysdeps/linux/mips/makecontext.S
new file mode 100644
index 0000000..6427339
--- /dev/null
+++ b/libc/sysdeps/linux/mips/makecontext.S
@@ -0,0 +1,188 @@
+/* Modify saved context.
+ Copyright (C) 2009 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Maciej W. Rozycki <macro@codesourcery.com>.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+#include <sys/asm.h>
+#include <sys/fpregdef.h>
+#include <sys/regdef.h>
+
+#include "ucontext_i.h"
+
+/* int makecontext (ucontext_t *ucp, (void *func) (), int argc, ...) */
+
+ .text
+LOCALSZ = 0
+ARGSZ = 0
+MASK = 0x00000000
+#ifdef __PIC__
+LOCALSZ = 1 /* save gp */
+#endif
+#if _MIPS_SIM != _ABIO32
+ARGSZ = 5 /* save a3-a7 */
+# ifdef __PIC__
+MASK = 0x10000000
+# endif
+#endif
+FRAMESZ = (((ARGSZ + LOCALSZ) * SZREG) + ALSZ) & ALMASK
+GPOFF = FRAMESZ - ((ARGSZ + 1) * SZREG)
+#if _MIPS_SIM != _ABIO32
+A3OFF = FRAMESZ - (5 * SZREG) /* callee-allocated */
+A4OFF = FRAMESZ - (4 * SZREG)
+A5OFF = FRAMESZ - (3 * SZREG)
+A6OFF = FRAMESZ - (2 * SZREG)
+A7OFF = FRAMESZ - (1 * SZREG)
+NARGREGS = 8
+#else
+A3OFF = FRAMESZ + (3 * SZREG) /* caller-allocated */
+NARGREGS = 4
+#endif
+
+NESTED (__makecontext, FRAMESZ, ra)
+ .mask MASK, -(ARGSZ * SZREG)
+ .fmask 0x00000000, 0
+
+98:
+#ifdef __PIC__
+ SETUP_GP
+#endif
+
+ PTR_ADDIU sp, -FRAMESZ
+
+#ifdef __PIC__
+ SETUP_GP64 (GPOFF, __makecontext)
+ SAVE_GP (GPOFF)
+#endif
+
+#ifdef PROF
+ .set noat
+ move AT, ra
+ jal _mcount
+ .set at
+#endif
+
+ /* Store args to be passed. */
+ REG_S a3, A3OFF(sp)
+#if _MIPS_SIM != _ABIO32
+ REG_S a4, A4OFF(sp)
+ REG_S a5, A5OFF(sp)
+ REG_S a6, A6OFF(sp)
+ REG_S a7, A7OFF(sp)
+#endif
+
+ /* Store a magic flag. */
+ li v1, 1
+ REG_S v1, (0 * SZREG + MCONTEXT_GREGS)(a0) /* zero */
+
+ /* Set up the stack. */
+ PTR_L t0, STACK_SP(a0)
+ PTR_L t2, STACK_SIZE(a0)
+ PTR_ADDIU t1, sp, A3OFF
+ PTR_ADDU t0, t2
+ and t0, ALMASK
+ blez a2, 2f /* no arguments */
+
+ /* Store register arguments. */
+ PTR_ADDIU t2, a0, MCONTEXT_GREGS + 4 * SZREG
+ move t3, zero
+0:
+ addiu t3, 1
+ REG_L v1, (t1)
+ PTR_ADDIU t1, SZREG
+ REG_S v1, (t2)
+ PTR_ADDIU t2, SZREG
+ bgeu t3, a2, 2f /* all done */
+ bltu t3, NARGREGS, 0b /* next */
+
+ /* Make room for stack arguments. */
+ PTR_SUBU t2, a2, t3
+ PTR_SLL t2, 3
+ PTR_SUBU t0, t2
+ and t0, ALMASK
+
+ /* Store stack arguments. */
+ move t2, t0
+1:
+ addiu t3, 1
+ REG_L v1, (t1)
+ PTR_ADDIU t1, SZREG
+ REG_S v1, (t2)
+ PTR_ADDIU t2, SZREG
+ bltu t3, a2, 1b /* next */
+
+2:
+#if _MIPS_SIM == _ABIO32
+ /* Make room for a0-a3 storage. */
+ PTR_ADDIU t0, -(NARGSAVE * SZREG)
+#endif
+ PTR_L v1, UCONTEXT_LINK(a0)
+#ifdef __PIC__
+ PTR_ADDIU t9, 99f - 98b
+#else
+ PTR_LA t9, 99f
+#endif
+ REG_S t0, (29 * SZREG + MCONTEXT_GREGS)(a0) /* sp */
+ REG_S v1, (16 * SZREG + MCONTEXT_GREGS)(a0) /* s0 */
+#ifdef __PIC__
+ REG_S gp, (17 * SZREG + MCONTEXT_GREGS)(a0) /* s1 */
+#endif
+ REG_S t9, (31 * SZREG + MCONTEXT_GREGS)(a0) /* ra */
+ REG_S a1, MCONTEXT_PC(a0)
+
+#ifdef __PIC__
+ RESTORE_GP64
+ PTR_ADDIU sp, FRAMESZ
+#endif
+ jr ra
+
+99:
+#ifdef __PIC__
+ move gp, s1
+#endif
+ move a0, zero
+ beqz s0, 0f
+
+ /* setcontext (ucp) */
+ move a0, s0
+#ifdef __PIC__
+ PTR_LA t9, JUMPTARGET (__setcontext)
+ jalr t9
+# if _MIPS_SIM == _ABIO32
+ move gp, s1
+# endif
+#else
+ jal JUMPTARGET (__setcontext)
+#endif
+ move a0, v0
+
+0:
+ /* exit (a0) */
+#ifdef __PIC__
+ PTR_LA t9, HIDDEN_JUMPTARGET (exit)
+ jalr t9
+#else
+ jal HIDDEN_JUMPTARGET (exit)
+#endif
+
+ /* You don't exist, you won't feel anything. */
+1:
+ lb zero, (zero)
+ b 1b
+PSEUDO_END (__makecontext)
+
+weak_alias (__makecontext, makecontext)
diff --git a/libc/sysdeps/linux/mips/setcontext.S b/libc/sysdeps/linux/mips/setcontext.S
new file mode 100644
index 0000000..d3cde0e
--- /dev/null
+++ b/libc/sysdeps/linux/mips/setcontext.S
@@ -0,0 +1,191 @@
+/* Set current context.
+ Copyright (C) 2009 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Maciej W. Rozycki <macro@codesourcery.com>.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+#include <sys/asm.h>
+#include <sys/fpregdef.h>
+#include <sys/regdef.h>
+
+#include "ucontext_i.h"
+
+/* int setcontext (const ucontext_t *ucp) */
+
+ .text
+LOCALSZ = 0
+ARGSZ = 0
+MASK = 0x00000000
+#ifdef __PIC__
+LOCALSZ = 1 /* save gp */
+#endif
+#if _MIPS_SIM != _ABIO32
+ARGSZ = 1 /* save a0 */
+# ifdef __PIC__
+MASK = 0x10000000
+# endif
+#endif
+FRAMESZ = (((ARGSZ + LOCALSZ) * SZREG) + ALSZ) & ALMASK
+GPOFF = FRAMESZ - ((ARGSZ + 1) * SZREG)
+#if _MIPS_SIM != _ABIO32
+A0OFF = FRAMESZ - (1 * SZREG) /* callee-allocated */
+#else
+A0OFF = FRAMESZ + (0 * SZREG) /* caller-allocated */
+#endif
+
+NESTED (__setcontext, FRAMESZ, ra)
+ .mask MASK, -(ARGSZ * SZREG)
+ .fmask 0x00000000, 0
+
+#ifdef __PIC__
+ SETUP_GP
+#endif
+
+ PTR_ADDIU sp, -FRAMESZ
+
+#ifdef __PIC__
+ SETUP_GP64 (GPOFF, __setcontext)
+ SAVE_GP (GPOFF)
+#endif
+
+#ifdef PROF
+ .set noat
+ move AT, ra
+ jal _mcount
+ .set at
+#endif
+
+ /* Check for the magic flag. */
+ li v0, 1
+ REG_L v1, (0 * SZREG + MCONTEXT_GREGS)(a0) /* zero */
+ bne v0, v1, 98f
+
+ REG_S a0, A0OFF(sp)
+
+/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, NULL, _NSIG8) */
+ li a3, _NSIG8
+ move a2, zero
+ PTR_ADDU a1, a0, UCONTEXT_SIGMASK
+ li a0, SIG_SETMASK
+
+ li v0, SYS_ify (rt_sigprocmask)
+ syscall
+ bnez a3, 99f
+
+ REG_L v0, A0OFF(sp)
+
+#ifdef __mips_hard_float
+# if _MIPS_SIM == _ABI64
+ l.d fs0, (24 * SZREG + MCONTEXT_FPREGS)(v0)
+ l.d fs1, (25 * SZREG + MCONTEXT_FPREGS)(v0)
+ l.d fs2, (26 * SZREG + MCONTEXT_FPREGS)(v0)
+ l.d fs3, (27 * SZREG + MCONTEXT_FPREGS)(v0)
+ l.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(v0)
+ l.d fs5, (29 * SZREG + MCONTEXT_FPREGS)(v0)
+ l.d fs6, (30 * SZREG + MCONTEXT_FPREGS)(v0)
+ l.d fs7, (31 * SZREG + MCONTEXT_FPREGS)(v0)
+
+# else /* _MIPS_SIM != _ABI64 */
+ l.d fs0, (20 * SZREG + MCONTEXT_FPREGS)(v0)
+ l.d fs1, (22 * SZREG + MCONTEXT_FPREGS)(v0)
+ l.d fs2, (24 * SZREG + MCONTEXT_FPREGS)(v0)
+ l.d fs3, (26 * SZREG + MCONTEXT_FPREGS)(v0)
+ l.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(v0)
+ l.d fs5, (30 * SZREG + MCONTEXT_FPREGS)(v0)
+
+# endif /* _MIPS_SIM != _ABI64 */
+
+ lw v1, MCONTEXT_FPC_CSR(v0)
+ ctc1 v1, fcr31
+#endif /* __mips_hard_float */
+
+ /* Note the contents of argument registers will be random
+ unless makecontext() has been called. */
+ REG_L a0, (4 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L a1, (5 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L a2, (6 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L a3, (7 * SZREG + MCONTEXT_GREGS)(v0)
+#if _MIPS_SIM != _ABIO32
+ REG_L a4, (8 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L a5, (9 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L a6, (10 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L a7, (11 * SZREG + MCONTEXT_GREGS)(v0)
+#endif
+
+ REG_L s0, (16 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L s1, (17 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L s2, (18 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L s3, (19 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L s4, (20 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L s5, (21 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L s6, (22 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L s7, (23 * SZREG + MCONTEXT_GREGS)(v0)
+#if ! defined (__PIC__) || _MIPS_SIM != _ABIO32
+ REG_L gp, (28 * SZREG + MCONTEXT_GREGS)(v0)
+#endif
+ REG_L sp, (29 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L fp, (30 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L ra, (31 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L t9, MCONTEXT_PC(v0)
+
+ move v0, zero
+ jr t9
+
+98:
+ /* This is a context obtained from a signal handler.
+ Perform a full restore by pushing the context
+ passed onto a simulated signal frame on the stack
+ and call the signal return syscall as if a signal
+ handler exited normally. */
+ PTR_ADDIU sp, -((RT_SIGFRAME_SIZE + ALSZ) & ALMASK)
+
+ /* Only ucontext is referred to from rt_sigreturn,
+ copy it. */
+ PTR_ADDIU t1, sp, RT_SIGFRAME_UCONTEXT
+ li t3, ((UCONTEXT_SIZE + SZREG - 1) / SZREG) - 1
+0:
+ REG_L t2, (a0)
+ PTR_ADDIU a0, SZREG
+ REG_S t2, (t1)
+ PTR_ADDIU t1, SZREG
+ .set noreorder
+ bgtz t3, 0b
+ addiu t3, -1
+ .set reorder
+
+/* rt_sigreturn () -- no arguments, sp points to struct rt_sigframe. */
+ li v0, SYS_ify (rt_sigreturn)
+ syscall
+
+ /* Restore the stack and fall through to the error
+ path. Successful rt_sigreturn never returns to
+ its calling place. */
+ PTR_ADDIU sp, ((RT_SIGFRAME_SIZE + ALSZ) & ALMASK)
+99:
+#ifdef __PIC__
+ PTR_LA t9, JUMPTARGET (__syscall_error)
+ RESTORE_GP64
+ PTR_ADDIU sp, FRAMESZ
+ jr t9
+
+#else /* ! __PIC__ */
+
+ j JUMPTARGET (__syscall_error)
+#endif /* ! __PIC__ */
+PSEUDO_END (__setcontext)
+
+weak_alias (__setcontext, setcontext)
diff --git a/libc/sysdeps/linux/mips/swapcontext.S b/libc/sysdeps/linux/mips/swapcontext.S
new file mode 100644
index 0000000..c7ac19b
--- /dev/null
+++ b/libc/sysdeps/linux/mips/swapcontext.S
@@ -0,0 +1,211 @@
+/* Save and set current context.
+ Copyright (C) 2009 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Maciej W. Rozycki <macro@codesourcery.com>.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+#include <sys/asm.h>
+#include <sys/fpregdef.h>
+#include <sys/regdef.h>
+
+#include "ucontext_i.h"
+
+/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */
+
+ .text
+LOCALSZ = 0
+ARGSZ = 0
+MASK = 0x00000000
+#ifdef __PIC__
+LOCALSZ = 1 /* save gp */
+#endif
+#if _MIPS_SIM != _ABIO32
+ARGSZ = 1 /* save a1 */
+# ifdef __PIC__
+MASK = 0x10000000
+# endif
+#endif
+FRAMESZ = (((ARGSZ + LOCALSZ) * SZREG) + ALSZ) & ALMASK
+GPOFF = FRAMESZ - ((ARGSZ + 1) * SZREG)
+#if _MIPS_SIM != _ABIO32
+A1OFF = FRAMESZ - (1 * SZREG) /* callee-allocated */
+#else
+A1OFF = FRAMESZ + (1 * SZREG) /* caller-allocated */
+#endif
+
+NESTED (__swapcontext, FRAMESZ, ra)
+ .mask MASK, -(ARGSZ * SZREG)
+ .fmask 0x00000000, 0
+
+#ifdef __PIC__
+ SETUP_GP
+
+ move a2, sp
+# define _SP a2
+
+# if _MIPS_SIM != _ABIO32
+ move a3, gp
+# define _GP a3
+# endif
+
+ PTR_ADDIU sp, -FRAMESZ
+ SETUP_GP64 (GPOFF, __swapcontext)
+ SAVE_GP (GPOFF)
+
+#else /* ! __PIC__ */
+# define _SP sp
+# define _GP gp
+
+#endif /* ! __PIC__ */
+
+#ifdef PROF
+ .set noat
+ move AT, ra
+ jal _mcount
+ .set at
+#endif
+
+ /* Store a magic flag. */
+ li v1, 1
+ REG_S v1, (0 * SZREG + MCONTEXT_GREGS)(a0) /* zero */
+
+ REG_S s0, (16 * SZREG + MCONTEXT_GREGS)(a0)
+ REG_S s1, (17 * SZREG + MCONTEXT_GREGS)(a0)
+ REG_S s2, (18 * SZREG + MCONTEXT_GREGS)(a0)
+ REG_S s3, (19 * SZREG + MCONTEXT_GREGS)(a0)
+ REG_S s4, (20 * SZREG + MCONTEXT_GREGS)(a0)
+ REG_S s5, (21 * SZREG + MCONTEXT_GREGS)(a0)
+ REG_S s6, (22 * SZREG + MCONTEXT_GREGS)(a0)
+ REG_S s7, (23 * SZREG + MCONTEXT_GREGS)(a0)
+#if ! defined (__PIC__) || _MIPS_SIM != _ABIO32
+ REG_S _GP, (28 * SZREG + MCONTEXT_GREGS)(a0)
+#endif
+ REG_S _SP, (29 * SZREG + MCONTEXT_GREGS)(a0)
+ REG_S fp, (30 * SZREG + MCONTEXT_GREGS)(a0)
+ REG_S ra, (31 * SZREG + MCONTEXT_GREGS)(a0)
+ REG_S ra, MCONTEXT_PC(a0)
+
+#ifdef __mips_hard_float
+# if _MIPS_SIM == _ABI64
+ s.d fs0, (24 * SZREG + MCONTEXT_FPREGS)(a0)
+ s.d fs1, (25 * SZREG + MCONTEXT_FPREGS)(a0)
+ s.d fs2, (26 * SZREG + MCONTEXT_FPREGS)(a0)
+ s.d fs3, (27 * SZREG + MCONTEXT_FPREGS)(a0)
+ s.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(a0)
+ s.d fs5, (29 * SZREG + MCONTEXT_FPREGS)(a0)
+ s.d fs6, (30 * SZREG + MCONTEXT_FPREGS)(a0)
+ s.d fs7, (31 * SZREG + MCONTEXT_FPREGS)(a0)
+
+# else /* _MIPS_SIM != _ABI64 */
+ s.d fs0, (20 * SZREG + MCONTEXT_FPREGS)(a0)
+ s.d fs1, (22 * SZREG + MCONTEXT_FPREGS)(a0)
+ s.d fs2, (24 * SZREG + MCONTEXT_FPREGS)(a0)
+ s.d fs3, (26 * SZREG + MCONTEXT_FPREGS)(a0)
+ s.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(a0)
+ s.d fs5, (30 * SZREG + MCONTEXT_FPREGS)(a0)
+
+# endif /* _MIPS_SIM != _ABI64 */
+
+ cfc1 v1, fcr31
+ sw v1, MCONTEXT_FPC_CSR(a0)
+#endif /* __mips_hard_float */
+
+ REG_S a1, A1OFF(sp)
+
+/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, &oucp->uc_sigmask, _NSIG8) */
+ li a3, _NSIG8
+ PTR_ADDU a2, a0, UCONTEXT_SIGMASK
+ PTR_ADDU a1, a1, UCONTEXT_SIGMASK
+ li a0, SIG_SETMASK
+
+ li v0, SYS_ify (rt_sigprocmask)
+ syscall
+ bnez a3, 99f
+
+ REG_L v0, A1OFF(sp)
+
+#ifdef __mips_hard_float
+# if _MIPS_SIM == _ABI64
+ l.d fs0, (24 * SZREG + MCONTEXT_FPREGS)(v0)
+ l.d fs1, (25 * SZREG + MCONTEXT_FPREGS)(v0)
+ l.d fs2, (26 * SZREG + MCONTEXT_FPREGS)(v0)
+ l.d fs3, (27 * SZREG + MCONTEXT_FPREGS)(v0)
+ l.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(v0)
+ l.d fs5, (29 * SZREG + MCONTEXT_FPREGS)(v0)
+ l.d fs6, (30 * SZREG + MCONTEXT_FPREGS)(v0)
+ l.d fs7, (31 * SZREG + MCONTEXT_FPREGS)(v0)
+
+# else /* _MIPS_SIM != _ABI64 */
+ l.d fs0, (20 * SZREG + MCONTEXT_FPREGS)(v0)
+ l.d fs1, (22 * SZREG + MCONTEXT_FPREGS)(v0)
+ l.d fs2, (24 * SZREG + MCONTEXT_FPREGS)(v0)
+ l.d fs3, (26 * SZREG + MCONTEXT_FPREGS)(v0)
+ l.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(v0)
+ l.d fs5, (30 * SZREG + MCONTEXT_FPREGS)(v0)
+
+# endif /* _MIPS_SIM != _ABI64 */
+
+ lw v1, MCONTEXT_FPC_CSR(v0)
+ ctc1 v1, fcr31
+#endif /* __mips_hard_float */
+
+ /* Note the contents of argument registers will be random
+ unless makecontext() has been called. */
+ REG_L a0, (4 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L a1, (5 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L a2, (6 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L a3, (7 * SZREG + MCONTEXT_GREGS)(v0)
+#if _MIPS_SIM != _ABIO32
+ REG_L a4, (8 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L a5, (9 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L a6, (10 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L a7, (11 * SZREG + MCONTEXT_GREGS)(v0)
+#endif
+
+ REG_L s0, (16 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L s1, (17 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L s2, (18 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L s3, (19 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L s4, (20 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L s5, (21 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L s6, (22 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L s7, (23 * SZREG + MCONTEXT_GREGS)(v0)
+#if ! defined (__PIC__) || _MIPS_SIM != _ABIO32
+ REG_L gp, (28 * SZREG + MCONTEXT_GREGS)(v0)
+#endif
+ REG_L sp, (29 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L fp, (30 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L ra, (31 * SZREG + MCONTEXT_GREGS)(v0)
+ REG_L t9, MCONTEXT_PC(v0)
+
+ move v0, zero
+ jr t9
+
+99:
+#ifdef __PIC__
+ PTR_LA t9, JUMPTARGET (__syscall_error)
+ RESTORE_GP64
+ PTR_ADDIU sp, FRAMESZ
+ jr t9
+
+#else /* ! __PIC__ */
+
+ j JUMPTARGET (__syscall_error)
+#endif /* ! __PIC__ */
+PSEUDO_END (__swapcontext)
+
+weak_alias (__swapcontext, swapcontext)
diff --git a/libc/sysdeps/linux/mips/ucontext_i.sym b/libc/sysdeps/linux/mips/ucontext_i.sym
new file mode 100644
index 0000000..f14b886
--- /dev/null
+++ b/libc/sysdeps/linux/mips/ucontext_i.sym
@@ -0,0 +1,52 @@
+#include <inttypes.h>
+#include <signal.h>
+#include <stddef.h>
+#include <sys/ucontext.h>
+
+#include <kernel_rt_sigframe.h>
+
+-- Constants used by the rt_sigprocmask call.
+
+SIG_BLOCK
+SIG_SETMASK
+
+_NSIG8 (_NSIG / 8)
+
+-- Offsets of the fields in the kernel rt_sigframe_t structure.
+#define rt_sigframe(member) offsetof (kernel_rt_sigframe_t, member)
+
+RT_SIGFRAME_UCONTEXT rt_sigframe (rs_uc)
+
+RT_SIGFRAME_SIZE sizeof (kernel_rt_sigframe_t)
+
+-- Offsets of the fields in the ucontext_t structure.
+#define ucontext(member) offsetof (ucontext_t, member)
+#define stack(member) ucontext (uc_stack.member)
+#define mcontext(member) ucontext (uc_mcontext.member)
+
+UCONTEXT_FLAGS ucontext (uc_flags)
+UCONTEXT_LINK ucontext (uc_link)
+UCONTEXT_STACK ucontext (uc_stack)
+UCONTEXT_MCONTEXT ucontext (uc_mcontext)
+UCONTEXT_SIGMASK ucontext (uc_sigmask)
+
+STACK_SP stack (ss_sp)
+STACK_SIZE stack (ss_size)
+STACK_FLAGS stack (ss_flags)
+
+MCONTEXT_GREGS mcontext (gregs)
+MCONTEXT_FPREGS mcontext (fpregs)
+MCONTEXT_MDHI mcontext (mdhi)
+MCONTEXT_HI1 mcontext (hi1)
+MCONTEXT_HI2 mcontext (hi2)
+MCONTEXT_HI3 mcontext (hi3)
+MCONTEXT_MDLO mcontext (mdlo)
+MCONTEXT_LO1 mcontext (lo1)
+MCONTEXT_LO2 mcontext (lo2)
+MCONTEXT_LO3 mcontext (lo3)
+MCONTEXT_PC mcontext (pc)
+MCONTEXT_FPC_CSR mcontext (fpc_csr)
+MCONTEXT_USED_MATH mcontext (used_math)
+MCONTEXT_DSP mcontext (dsp)
+
+UCONTEXT_SIZE sizeof (ucontext_t)
diff --git a/libc/sysdeps/linux/x86_64/Makefile.arch b/libc/sysdeps/linux/x86_64/Makefile.arch
index 7491d92..93b8259 100644
--- a/libc/sysdeps/linux/x86_64/Makefile.arch
+++ b/libc/sysdeps/linux/x86_64/Makefile.arch
@@ -20,3 +20,8 @@ ifeq ($(UCLIBC_HAS_TLS),y)
SSRC += sched_getcpu.S
endif
endif
+
+ifeq ($(UCLIBC_HAS_CONTEXT_FUNCS),y)
+CSRC += makecontext.c
+SSRC += setcontext.S getcontext.S swapcontext.S __start_context.S
+endif
diff --git a/libc/sysdeps/linux/x86_64/__start_context.S b/libc/sysdeps/linux/x86_64/__start_context.S
new file mode 100644
index 0000000..9f2ee23
--- /dev/null
+++ b/libc/sysdeps/linux/x86_64/__start_context.S
@@ -0,0 +1,49 @@
+/* Copyright (C) 2002-2012 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Andreas Jaeger <aj@suse.de>, 2002.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+
+/* This is the helper code which gets called if a function which is
+ registered with 'makecontext' returns. In this case we have to
+ install the context listed in the uc_link element of the context
+ 'makecontext' manipulated at the time of the 'makecontext' call.
+ If the pointer is NULL the process must terminate. */
+
+
+ENTRY(__start_context)
+ /* This removes the parameters passed to the function given to
+ 'makecontext' from the stack. RBX contains the address
+ on the stack pointer for the next context. */
+ movq %rbx, %rsp
+
+ popq %rdi /* This is the next context. */
+ cfi_adjust_cfa_offset(-8)
+ testq %rdi, %rdi
+ je 2f /* If it is zero exit. */
+
+ call JUMPTARGET(__setcontext)
+ /* If this returns (which can happen if the syscall fails) we'll
+ exit the program with the return error value (-1). */
+ movq %rax,%rdi
+
+2:
+ call HIDDEN_JUMPTARGET(exit)
+ /* The 'exit' call should never return. In case it does cause
+ the process to terminate. */
+ hlt
+END(__start_context)
diff --git a/libc/sysdeps/linux/x86_64/getcontext.S b/libc/sysdeps/linux/x86_64/getcontext.S
new file mode 100644
index 0000000..dcebc4f
--- /dev/null
+++ b/libc/sysdeps/linux/x86_64/getcontext.S
@@ -0,0 +1,88 @@
+/* Save current context.
+ Copyright (C) 2002-2012 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Andreas Jaeger <aj@suse.de>, 2002.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+
+#include "ucontext_i.h"
+
+/* int __getcontext (ucontext_t *ucp)
+
+ Saves the machine context in UCP such that when it is activated,
+ it appears as if __getcontext() returned again.
+
+ This implementation is intended to be used for *synchronous* context
+ switches only. Therefore, it does not have to save anything
+ other than the PRESERVED state. */
+
+
+ENTRY(__getcontext)
+ /* Save the preserved registers, the registers used for passing
+ args, and the return address. */
+ movq %rbx, oRBX(%rdi)
+ movq %rbp, oRBP(%rdi)
+ movq %r12, oR12(%rdi)
+ movq %r13, oR13(%rdi)
+ movq %r14, oR14(%rdi)
+ movq %r15, oR15(%rdi)
+
+ movq %rdi, oRDI(%rdi)
+ movq %rsi, oRSI(%rdi)
+ movq %rdx, oRDX(%rdi)
+ movq %rcx, oRCX(%rdi)
+ movq %r8, oR8(%rdi)
+ movq %r9, oR9(%rdi)
+
+ movq (%rsp), %rcx
+ movq %rcx, oRIP(%rdi)
+ leaq 8(%rsp), %rcx /* Exclude the return address. */
+ movq %rcx, oRSP(%rdi)
+
+ /* We have separate floating-point register content memory on the
+ stack. We use the __fpregs_mem block in the context. Set the
+ links up correctly. */
+
+ leaq oFPREGSMEM(%rdi), %rcx
+ movq %rcx, oFPREGS(%rdi)
+ /* Save the floating-point environment. */
+ fnstenv (%rcx)
+ fldenv (%rcx)
+ stmxcsr oMXCSR(%rdi)
+
+ /* Save the current signal mask with
+ rt_sigprocmask (SIG_BLOCK, NULL, set,_NSIG/8). */
+ leaq oSIGMASK(%rdi), %rdx
+ xorl %esi,%esi
+#if SIG_BLOCK == 0
+ xorl %edi, %edi
+#else
+ movl $SIG_BLOCK, %edi
+#endif
+ movl $_NSIG8,%r10d
+ movl $__NR_rt_sigprocmask, %eax
+ syscall
+ cmpq $-4095, %rax /* Check %rax for error. */
+ jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */
+
+ /* All done, return 0 for success. */
+ xorl %eax, %eax
+L(pseudo_end):
+ ret
+PSEUDO_END(__getcontext)
+
+weak_alias (__getcontext, getcontext)
diff --git a/libc/sysdeps/linux/x86_64/makecontext.c b/libc/sysdeps/linux/x86_64/makecontext.c
new file mode 100644
index 0000000..5473031
--- /dev/null
+++ b/libc/sysdeps/linux/x86_64/makecontext.c
@@ -0,0 +1,121 @@
+/* Create new context.
+ Copyright (C) 2002, 2004, 2005, 2008 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Andreas Jaeger <aj@suse.de>, 2002.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <ucontext.h>
+
+#include "ucontext_i.h"
+
+/* This implementation can handle any ARGC value but only
+ normal integer parameters.
+ makecontext sets up a stack and the registers for the
+ user context. The stack looks like this:
+ +-----------------------+
+ | next context |
+ +-----------------------+
+ | parameter 7-n |
+ +-----------------------+
+ | trampoline address |
+ %rsp -> +-----------------------+
+
+ The registers are set up like this:
+ %rdi,%rsi,%rdx,%rcx,%r8,%r9: parameter 1 to 6
+ %rbx : address of next context
+ %rsp : stack pointer.
+*/
+
+/* XXX: This implementation currently only handles integer arguments.
+ To handle long int and pointer arguments the va_arg arguments needs
+ to be changed to long and also the stdlib/tst-setcontext.c file needs
+ to be changed to pass long arguments to makecontext. */
+
+
+void
+__makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
+{
+ extern void __start_context (void);
+ greg_t *sp;
+ unsigned int idx_uc_link;
+ va_list ap;
+ int i;
+
+ /* Generate room on stack for parameter if needed and uc_link. */
+ sp = (greg_t *) ((uintptr_t) ucp->uc_stack.ss_sp
+ + ucp->uc_stack.ss_size);
+ sp -= (argc > 6 ? argc - 6 : 0) + 1;
+ /* Align stack and make space for trampoline address. */
+ sp = (greg_t *) ((((uintptr_t) sp) & -16L) - 8);
+
+ idx_uc_link = (argc > 6 ? argc - 6 : 0) + 1;
+
+ /* Setup context ucp. */
+ /* Address to jump to. */
+ ucp->uc_mcontext.gregs[REG_RIP] = (uintptr_t) func;
+ /* Setup rbx.*/
+ ucp->uc_mcontext.gregs[REG_RBX] = (uintptr_t) &sp[idx_uc_link];
+ ucp->uc_mcontext.gregs[REG_RSP] = (uintptr_t) sp;
+
+ /* Setup stack. */
+ sp[0] = (uintptr_t) &__start_context;
+ sp[idx_uc_link] = (uintptr_t) ucp->uc_link;
+
+ va_start (ap, argc);
+ /* Handle arguments.
+
+ The standard says the parameters must all be int values. This is
+ an historic accident and would be done differently today. For
+ x86-64 all integer values are passed as 64-bit values and
+ therefore extending the API to copy 64-bit values instead of
+ 32-bit ints makes sense. It does not break existing
+ functionality and it does not violate the standard which says
+ that passing non-int values means undefined behavior. */
+ for (i = 0; i < argc; ++i)
+ switch (i)
+ {
+ case 0:
+ ucp->uc_mcontext.gregs[REG_RDI] = va_arg (ap, greg_t);
+ break;
+ case 1:
+ ucp->uc_mcontext.gregs[REG_RSI] = va_arg (ap, greg_t);
+ break;
+ case 2:
+ ucp->uc_mcontext.gregs[REG_RDX] = va_arg (ap, greg_t);
+ break;
+ case 3:
+ ucp->uc_mcontext.gregs[REG_RCX] = va_arg (ap, greg_t);
+ break;
+ case 4:
+ ucp->uc_mcontext.gregs[REG_R8] = va_arg (ap, greg_t);
+ break;
+ case 5:
+ ucp->uc_mcontext.gregs[REG_R9] = va_arg (ap, greg_t);
+ break;
+ default:
+ /* Put value on stack. */
+ sp[i - 5] = va_arg (ap, greg_t);
+ break;
+ }
+ va_end (ap);
+
+}
+
+
+weak_alias (__makecontext, makecontext)
diff --git a/libc/sysdeps/linux/x86_64/setcontext.S b/libc/sysdeps/linux/x86_64/setcontext.S
new file mode 100644
index 0000000..561ab9f
--- /dev/null
+++ b/libc/sysdeps/linux/x86_64/setcontext.S
@@ -0,0 +1,103 @@
+/* Install given context.
+ Copyright (C) 2002-2012 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Andreas Jaeger <aj@suse.de>, 2002.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+
+#include "ucontext_i.h"
+
+
+/* int __setcontext (const ucontext_t *ucp)
+
+ Restores the machine context in UCP and thereby resumes execution
+ in that context.
+
+ This implementation is intended to be used for *synchronous* context
+ switches only. Therefore, it does not have to restore anything
+ other than the PRESERVED state. */
+
+ENTRY(__setcontext)
+ /* Save argument since syscall will destroy it. */
+ pushq %rdi
+ cfi_adjust_cfa_offset(8)
+
+ /* Set the signal mask with
+ rt_sigprocmask (SIG_SETMASK, mask, NULL, _NSIG/8). */
+ leaq oSIGMASK(%rdi), %rsi
+ xorl %edx, %edx
+ movl $SIG_SETMASK, %edi
+ movl $_NSIG8,%r10d
+ movl $__NR_rt_sigprocmask, %eax
+ syscall
+ popq %rdi /* Reload %rdi, adjust stack. */
+ cfi_adjust_cfa_offset(-8)
+ cmpq $-4095, %rax /* Check %rax for error. */
+ jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */
+
+ /* Restore the floating-point context. Not the registers, only the
+ rest. */
+ movq oFPREGS(%rdi), %rcx
+ fldenv (%rcx)
+ ldmxcsr oMXCSR(%rdi)
+
+
+ /* Load the new stack pointer, the preserved registers and
+ registers used for passing args. */
+ cfi_def_cfa(%rdi, 0)
+ cfi_offset(%rbx,oRBX)
+ cfi_offset(%rbp,oRBP)
+ cfi_offset(%r12,oR12)
+ cfi_offset(%r13,oR13)
+ cfi_offset(%r14,oR14)
+ cfi_offset(%r15,oR15)
+ cfi_offset(%rsp,oRSP)
+ cfi_offset(%rip,oRIP)
+
+ movq oRSP(%rdi), %rsp
+ movq oRBX(%rdi), %rbx
+ movq oRBP(%rdi), %rbp
+ movq oR12(%rdi), %r12
+ movq oR13(%rdi), %r13
+ movq oR14(%rdi), %r14
+ movq oR15(%rdi), %r15
+
+ /* The following ret should return to the address set with
+ getcontext. Therefore push the address on the stack. */
+ movq oRIP(%rdi), %rcx
+ pushq %rcx
+
+ movq oRSI(%rdi), %rsi
+ movq oRDX(%rdi), %rdx
+ movq oRCX(%rdi), %rcx
+ movq oR8(%rdi), %r8
+ movq oR9(%rdi), %r9
+
+ /* Setup finally %rdi. */
+ movq oRDI(%rdi), %rdi
+
+ /* End FDE here, we fall into another context. */
+ cfi_endproc
+ cfi_startproc
+
+ /* Clear rax to indicate success. */
+ xorl %eax, %eax
+L(pseudo_end):
+ ret
+PSEUDO_END(__setcontext)
+
+weak_alias (__setcontext, setcontext)
diff --git a/libc/sysdeps/linux/x86_64/swapcontext.S b/libc/sysdeps/linux/x86_64/swapcontext.S
new file mode 100644
index 0000000..6d2ebb8
--- /dev/null
+++ b/libc/sysdeps/linux/x86_64/swapcontext.S
@@ -0,0 +1,121 @@
+/* Save current context and install the given one.
+ Copyright (C) 2002-2012 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Andreas Jaeger <aj@suse.de>, 2002.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+
+#include "ucontext_i.h"
+
+
+/* int __swapcontext (ucontext_t *oucp, const ucontext_t *ucp);
+
+ Saves the machine context in oucp such that when it is activated,
+ it appears as if __swapcontextt() returned again, restores the
+ machine context in ucp and thereby resumes execution in that
+ context.
+
+ This implementation is intended to be used for *synchronous* context
+ switches only. Therefore, it does not have to save anything
+ other than the PRESERVED state. */
+
+ENTRY(__swapcontext)
+ /* Save the preserved registers, the registers used for passing args,
+ and the return address. */
+ movq %rbx, oRBX(%rdi)
+ movq %rbp, oRBP(%rdi)
+ movq %r12, oR12(%rdi)
+ movq %r13, oR13(%rdi)
+ movq %r14, oR14(%rdi)
+ movq %r15, oR15(%rdi)
+
+ movq %rdi, oRDI(%rdi)
+ movq %rsi, oRSI(%rdi)
+ movq %rdx, oRDX(%rdi)
+ movq %rcx, oRCX(%rdi)
+ movq %r8, oR8(%rdi)
+ movq %r9, oR9(%rdi)
+
+ movq (%rsp), %rcx
+ movq %rcx, oRIP(%rdi)
+ leaq 8(%rsp), %rcx /* Exclude the return address. */
+ movq %rcx, oRSP(%rdi)
+
+ /* We have separate floating-point register content memory on the
+ stack. We use the __fpregs_mem block in the context. Set the
+ links up correctly. */
+ leaq oFPREGSMEM(%rdi), %rcx
+ movq %rcx, oFPREGS(%rdi)
+ /* Save the floating-point environment. */
+ fnstenv (%rcx)
+ stmxcsr oMXCSR(%rdi)
+
+
+ /* The syscall destroys some registers, save them. */
+ movq %rsi, %r12
+
+ /* Save the current signal mask and install the new one with
+ rt_sigprocmask (SIG_BLOCK, newset, oldset,_NSIG/8). */
+ leaq oSIGMASK(%rdi), %rdx
+ leaq oSIGMASK(%rsi), %rsi
+ movl $SIG_SETMASK, %edi
+ movl $_NSIG8,%r10d
+ movl $__NR_rt_sigprocmask, %eax
+ syscall
+ cmpq $-4095, %rax /* Check %rax for error. */
+ jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */
+
+ /* Restore destroyed registers. */
+ movq %r12, %rsi
+
+ /* Restore the floating-point context. Not the registers, only the
+ rest. */
+ movq oFPREGS(%rsi), %rcx
+ fldenv (%rcx)
+ ldmxcsr oMXCSR(%rsi)
+
+ /* Load the new stack pointer and the preserved registers. */
+ movq oRSP(%rsi), %rsp
+ movq oRBX(%rsi), %rbx
+ movq oRBP(%rsi), %rbp
+ movq oR12(%rsi), %r12
+ movq oR13(%rsi), %r13
+ movq oR14(%rsi), %r14
+ movq oR15(%rsi), %r15
+
+ /* The following ret should return to the address set with
+ getcontext. Therefore push the address on the stack. */
+ movq oRIP(%rsi), %rcx
+ pushq %rcx
+
+ /* Setup registers used for passing args. */
+ movq oRDI(%rsi), %rdi
+ movq oRDX(%rsi), %rdx
+ movq oRCX(%rsi), %rcx
+ movq oR8(%rsi), %r8
+ movq oR9(%rsi), %r9
+
+ /* Setup finally %rsi. */
+ movq oRSI(%rsi), %rsi
+
+ /* Clear rax to indicate success. */
+ xorl %eax, %eax
+L(pseudo_end):
+ ret
+PSEUDO_END(__swapcontext)
+
+weak_alias (__swapcontext, swapcontext)
diff --git a/libc/sysdeps/linux/x86_64/ucontext_i.sym b/libc/sysdeps/linux/x86_64/ucontext_i.sym
new file mode 100644
index 0000000..af3e0e5
--- /dev/null
+++ b/libc/sysdeps/linux/x86_64/ucontext_i.sym
@@ -0,0 +1,37 @@
+#include <stddef.h>
+#include <signal.h>
+#include <sys/ucontext.h>
+
+--
+
+SIG_BLOCK
+SIG_SETMASK
+
+_NSIG8 (_NSIG / 8)
+
+#define ucontext(member) offsetof (ucontext_t, member)
+#define mcontext(member) ucontext (uc_mcontext.member)
+#define mreg(reg) mcontext (gregs[REG_##reg])
+
+oRBP mreg (RBP)
+oRSP mreg (RSP)
+oRBX mreg (RBX)
+oR8 mreg (R8)
+oR9 mreg (R9)
+oR10 mreg (R10)
+oR11 mreg (R11)
+oR12 mreg (R12)
+oR13 mreg (R13)
+oR14 mreg (R14)
+oR15 mreg (R15)
+oRDI mreg (RDI)
+oRSI mreg (RSI)
+oRDX mreg (RDX)
+oRAX mreg (RAX)
+oRCX mreg (RCX)
+oRIP mreg (RIP)
+oEFL mreg (EFL)
+oFPREGS mcontext (fpregs)
+oSIGMASK ucontext (uc_sigmask)
+oFPREGSMEM ucontext (__fpregs_mem)
+oMXCSR ucontext (__fpregs_mem.mxcsr)
diff --git a/libpthread/nptl/sysdeps/Makefile.commonarch b/libpthread/nptl/sysdeps/Makefile.commonarch
index 0c19216..8f5d61d 100644
--- a/libpthread/nptl/sysdeps/Makefile.commonarch
+++ b/libpthread/nptl/sysdeps/Makefile.commonarch
@@ -47,9 +47,8 @@ $(libpthread_arch_OUT)/gen_tcb-offsets.c: $(libpthread_arch_DIR)/tcb-offsets.sym
$(libpthread_arch_OUT)/gen_tcb-offsets.s: $(libpthread_arch_OUT)/gen_tcb-offsets.c | headers
$(compile.c)
libpthread-generated-y += $(libpthread_arch_OUT)/gen_tcb-offsets.s
-PTHREAD_TCB_OFFSET_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"
$(libpthread_arch_OUT)/tcb-offsets.h: $(libpthread_arch_OUT)/gen_tcb-offsets.s
- $(do_sed) $(PTHREAD_TCB_OFFSET_MANGLE) $< > $@
+ $(do_sed) $(PTHREAD_GENERATE_MANGLE) $< > $@
@if test ! -s $@ ; then rm -f $@ ; false ; fi
pregen-headers-$(UCLIBC_HAS_THREADS_NATIVE) += $(libpthread_arch_OUT)/tcb-offsets.h
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/Makefile.commonarch b/libpthread/nptl/sysdeps/unix/sysv/linux/Makefile.commonarch
index 477fb1a..3372214 100644
--- a/libpthread/nptl/sysdeps/unix/sysv/linux/Makefile.commonarch
+++ b/libpthread/nptl/sysdeps/unix/sysv/linux/Makefile.commonarch
@@ -177,8 +177,6 @@ CFLAGS-gen_pthread-pi-defines.c = -S
CFLAGS-gen_structsem.c = -S
CFLAGS-gen_unwindbuf.c = -S
-PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"
-
PTHREAD_LINUX_SYM := $(notdir $(wildcard $(libpthread_linux_DIR)/*.sym))
PTHREAD_LINUX_SYM_C := $(addprefix $(libpthread_linux_OUT)/gen_,$(PTHREAD_LINUX_SYM:.sym=.c))
PTHREAD_LINUX_SYM_S := $(PTHREAD_LINUX_SYM_C:.c=.s)