+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.
+
2002-08-30 Ulrich Drepper <drepper@redhat.com>
* elf/dynamic-link.h (elf_get_dynamic_info): Mark with
--- /dev/null
+/* Copyright (C) 2002 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#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. */
+ 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). */
+
+2: movq %rax,%rdi
+ call JUMPTARGET(exit)
+ /* The 'exit' call should never return. In case it does cause
+ the process to terminate. */
+ hlt
+END(__start_context)
other than the PRESERVED state. */
ENTRY(__swapcontext)
- /* Save the preserved registers and the return address. */
+ /* 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 %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 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. */
xorq %rax, %rax
git://sourceware.org / glibc.git / commitdiff