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Update.
2002-08-31 Andreas Jaeger <aj@suse.de> * sysdeps/unix/sysv/linux/x86_64/Makefile (sysdep_routines): Add __start_context. * sysdeps/unix/sysv/linux/x86_64/__start_context.S: New file. * sysdeps/unix/sysv/linux/x86_64/makecontext.c: New file. * sysdeps/unix/sysv/linux/x86_64/ucontext_i.h: Add defines for registers used for passing args. * sysdeps/unix/sysv/linux/x86_64/swapcontext.S: Save and restore all needed registers. * sysdeps/unix/sysv/linux/x86_64/setcontext.S: Restore all registers. * sysdeps/unix/sysv/linux/x86_64/getcontext.S: Save all needed registers.
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Andreas Jaeger
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ChangeLog
21
ChangeLog
@ -1,3 +1,24 @@
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2002-08-31 Andreas Jaeger <aj@suse.de>
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* sysdeps/unix/sysv/linux/x86_64/Makefile (sysdep_routines): Add
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__start_context.
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* sysdeps/unix/sysv/linux/x86_64/__start_context.S: New file.
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* sysdeps/unix/sysv/linux/x86_64/makecontext.c: New file.
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* sysdeps/unix/sysv/linux/x86_64/ucontext_i.h: Add defines for
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registers used for passing args.
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* sysdeps/unix/sysv/linux/x86_64/swapcontext.S: Save and restore
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all needed registers.
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* sysdeps/unix/sysv/linux/x86_64/setcontext.S: Restore all
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registers.
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* sysdeps/unix/sysv/linux/x86_64/getcontext.S: Save all needed
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registers.
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2002-08-30 Ulrich Drepper <drepper@redhat.com>
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* elf/dynamic-link.h (elf_get_dynamic_info): Mark with
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@ -44,3 +44,7 @@ $(objpfx)syscall-%.h $(objpfx)syscall-%.d: ../sysdeps/unix/sysv/linux/sys/syscal
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mv -f $(@:.h=.d)-t2 $(@:.h=.d)
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endif
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ifeq ($(subdir),stdlib)
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sysdep_routines += __start_context
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endif
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48
sysdeps/unix/sysv/linux/x86_64/__start_context.S
Normal file
48
sysdeps/unix/sysv/linux/x86_64/__start_context.S
Normal file
@ -0,0 +1,48 @@
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/* Copyright (C) 2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Andreas Jaeger <aj@suse.de>, 2002.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <sysdep.h>
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/* This is the helper code which gets called if a function which is
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registered with 'makecontext' returns. In this case we have to
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install the context listed in the uc_link element of the context
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'makecontext' manipulated at the time of the 'makecontext' call.
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If the pointer is NULL the process must terminate. */
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ENTRY(__start_context)
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/* This removes the parameters passed to the function given to
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'makecontext' from the stack. RBX contains the address
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on the stack pointer for the next context. */
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movq %rbx, %rsp
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popq %rdi /* This is the next context. */
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testq %rdi, %rdi
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je 2f /* If it is zero exit. */
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call JUMPTARGET(__setcontext)
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/* If this returns (which can happen if the syscall fails) we'll
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exit the program with the return error value (-1). */
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2: movq %rax,%rdi
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call JUMPTARGET(exit)
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/* The 'exit' call should never return. In case it does cause
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the process to terminate. */
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hlt
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END(__start_context)
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@ -33,7 +33,8 @@
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ENTRY(__getcontext)
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/* Save the preserved registers and the return address. */
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/* Save the preserved registers, the registers used for passing
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args, and the return address. */
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movq %rbx, oRBX(%rdi)
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movq %rbp, oRBP(%rdi)
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movq %r12, oR12(%rdi)
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@ -41,6 +42,13 @@ ENTRY(__getcontext)
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movq %r14, oR14(%rdi)
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movq %r15, oR15(%rdi)
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movq %rdi, oRDI(%rdi)
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movq %rsi, oRSI(%rdi)
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movq %rdx, oRDX(%rdi)
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movq %rcx, oRCX(%rdi)
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movq %r8, oR8(%rdi)
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movq %r9, oR9(%rdi)
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movq (%rsp), %rcx
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movq %rcx, oRIP(%rdi)
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leaq 8(%rsp), %rcx /* Exclude the return address. */
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@ -55,7 +55,8 @@ ENTRY(__setcontext)
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ldmxcsr oMXCSR(%rdi)
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/* Load the new stack pointer and the preserved registers. */
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/* Load the new stack pointer, the preserved registers and
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registers used for passing args. */
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movq oRSP(%rdi), %rsp
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movq oRBX(%rdi), %rbx
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movq oRBP(%rdi), %rbp
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@ -69,6 +70,15 @@ ENTRY(__setcontext)
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movq oRIP(%rdi), %rcx
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pushq %rcx
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movq oRSI(%rdi), %rsi
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movq oRDX(%rdi), %rdx
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movq oRCX(%rdi), %rcx
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movq oR8(%rdi), %r8
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movq oR9(%rdi), %r9
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/* Setup finally %rdi. */
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movq oRDI(%rdi), %rdi
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/* Clear rax to indicate success. */
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xorq %rax, %rax
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@ -35,7 +35,8 @@
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other than the PRESERVED state. */
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ENTRY(__swapcontext)
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/* Save the preserved registers and the return address. */
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/* Save the preserved registers, the registers used for passing args,
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and the return address. */
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movq %rbx, oRBX(%rdi)
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movq %rbp, oRBP(%rdi)
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movq %r12, oR12(%rdi)
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@ -43,6 +44,13 @@ ENTRY(__swapcontext)
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movq %r14, oR14(%rdi)
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movq %r15, oR15(%rdi)
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movq %rdi, oRDI(%rdi)
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movq %rsi, oRSI(%rdi)
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movq %rdx, oRDX(%rdi)
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movq %rcx, oRCX(%rdi)
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movq %r8, oR8(%rdi)
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movq %r9, oR9(%rdi)
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movq (%rsp), %rcx
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movq %rcx, oRIP(%rdi)
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leaq 8(%rsp), %rcx /* Exclude the return address. */
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@ -95,6 +103,16 @@ ENTRY(__swapcontext)
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movq oRIP(%rsi), %rcx
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pushq %rcx
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/* Setup registers used for passing args. */
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movq oRDI(%rsi), %rdi
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movq oRDX(%rsi), %rdx
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movq oRCX(%rsi), %rcx
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movq oR8(%rsi), %r8
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movq oR9(%rsi), %r9
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/* Setup finally %rsi. */
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movq oRSI(%rsi), %rsi
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/* Clear rax to indicate success. */
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xorq %rax, %rax
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@ -29,11 +29,17 @@
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#define oRBP 120
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#define oRSP 160
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#define oRBX 128
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#define oR8 40
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#define oR9 48
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#define oR12 72
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#define oR13 80
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#define oR14 88
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#define oR15 96
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#define oRDI 104
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#define oRSI 112
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#define oRDX 136
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#define oRAX 144
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#define oRCX 152
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#define oRIP 168
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#define oFPREGS 208
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#define oSIGMASK 280
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