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2003-04-06 Roland McGrath <roland@redhat.com>

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* sysdeps/unix/sysv/linux/i386/swapcontext.S: Rewrite register
	restoration as done for setcontext yesterday.
This commit is contained in:
Roland McGrath 2003-04-06 20:59:45 +00:00
parent b87507117c
commit 77f844138c
1 changed files with 20 additions and 32 deletions
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52
sysdeps/unix/sysv/linux/i386/swapcontext.S
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@ -1,5 +1,5 @@
/* Save current context and install the given one.
Copyright (C) 2001, 2002 Free Software Foundation, Inc.
Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
@ -78,43 +78,31 @@ ENTRY(__swapcontext)
movl oFPREGS(%eax), %ecx
fldenv (%ecx)
/* Restore the FS segment registers. */
/* 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), %ecx
/* Make room for 8 registers and the return address. We will load
the values from the stack. */
subl $36, %ecx
movl oESP(%eax), %esp
/* Move the values of all the 32-bit registers (except ESP) on
the stack. This happens in the form the 'popa' instruction
expects it. Before this block put the address of the code
to execute. */
movl oEDI(%eax), %ebx
movl oESI(%eax), %edx
movl oEBP(%eax), %esi
movl oEBX(%eax), %edi
movl %ebx, (%ecx)
movl %edx, 4(%ecx)
movl %esi, 8(%ecx)
movl %edi, 16(%ecx)
movl oEDX(%eax), %ebx
movl oECX(%eax), %edx
movl oEAX(%eax), %esi
movl oEIP(%eax), %edi
movl %ebx, 20(%ecx)
movl %edx, 24(%ecx)
movl %esi, 28(%ecx)
movl %edi, 32(%ecx)
/* Push the return address on the new stack so we can return there. */
pushl %ecx
/* Set the new stack address. The stack points now to the block
we put the register content in. */
movl %ecx, %esp
/* Restore the register content. */
popa
/* The following 'ret' will pop the addres of the code and jump
/* 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):