diff options
Diffstat (limited to 'sysdeps/i386/elf/setjmp.S')
| -rw-r--r-- | sysdeps/i386/elf/setjmp.S | 65 |
1 files changed, 56 insertions, 9 deletions
diff --git a/sysdeps/i386/elf/setjmp.S b/sysdeps/i386/elf/setjmp.S index 9cfa83dc31..c64c9ea696 100644 --- a/sysdeps/i386/elf/setjmp.S +++ b/sysdeps/i386/elf/setjmp.S @@ -1,5 +1,5 @@ /* setjmp for i386, ELF version. - Copyright (C) 1995, 1996, 1997, 2000 Free Software Foundation, Inc. + Copyright (C) 1995, 1996, 1997, 2000, 2001 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 @@ -24,28 +24,75 @@ #include "bp-sym.h" #include "bp-asm.h" +#define PARMS LINKAGE /* no space for saved regs */ +#define JMPBUF PARMS +#define SIGMSK JMPBUF+PTR_SIZE + /* We include the BSD entry points here as well but we make them weak. */ ENTRY (BP_SYM (setjmp)) .weak C_SYMBOL_NAME (BP_SYM (setjmp)) - PUSH_SIGNAL_MASK (1) /* Note that we have to use a non-exported symbol in the next jump since otherwise gas will emit it as a jump through the PLT which is what we cannot use here. */ - jmp .Linternal_sigsetjmp + ENTER + + movl JMPBUF(%esp), %eax + CHECK_BOUNDS_BOTH_WIDE (%eax, JMPBUF(%esp), $JB_SIZE) + + /* Save registers. */ + movl %ebx, (JB_BX*4)(%eax) + movl %esi, (JB_SI*4)(%eax) + movl %edi, (JB_DI*4)(%eax) + leal JMPBUF(%esp), %ecx /* Save SP as it will be after we return. */ + movl %ecx, (JB_SP*4)(%eax) + movl PCOFF(%esp), %ecx /* Save PC we are returning to now. */ + movl %ecx, (JB_PC*4)(%eax) + LEAVE /* pop frame pointer to prepare for tail-call. */ + movl %ebp, (JB_BP*4)(%eax) /* Save caller's frame pointer. */ + + /* Call __sigjmp_save. */ + pushl $1 + pushl 8(%esp) +#ifdef PIC + /* We cannot use the PLT, because it requires that %ebx be set, but + we can't save and restore our caller's value. Instead, we do an + indirect jump through the GOT, using for the temporary register + %ecx, which is call-clobbered. */ + call here2 +here2: popl %ecx + addl $_GLOBAL_OFFSET_TABLE_+[.-here2], %ecx + movl C_SYMBOL_NAME (BP_SYM (__sigjmp_save)@GOT)(%ecx), %ecx + call *%ecx +#else + call BP_SYM (__sigjmp_save) +#endif + popl %ecx + popl %edx + ret END (BP_SYM (setjmp)) ENTRY (BP_SYM (_setjmp)) .weak C_SYMBOL_NAME (BP_SYM (_setjmp)) - PUSH_SIGNAL_MASK (0) - /* FALL THROUGH */ + ENTER -#define PARMS LINKAGE /* no space for saved regs */ -#define JMPBUF PARMS -#define SIGMSK JMPBUF+PTR_SIZE + movl JMPBUF(%esp), %eax + CHECK_BOUNDS_BOTH_WIDE (%eax, JMPBUF(%esp), $JB_SIZE) + + /* Save registers. */ + movl %ebx, (JB_BX*4)(%eax) + movl %esi, (JB_SI*4)(%eax) + movl %edi, (JB_DI*4)(%eax) + leal JMPBUF(%esp), %ecx /* Save SP as it will be after we return. */ + movl %ecx, (JB_SP*4)(%eax) + movl PCOFF(%esp), %ecx /* Save PC we are returning to now. */ + movl %ecx, (JB_PC*4)(%eax) + LEAVE + movl %ebp, (JB_BP*4)(%eax) /* Save caller's frame pointer. */ + ret +END (BP_SYM (_setjmp)) ENTRY (BP_SYM (__sigsetjmp)) -.Linternal_sigsetjmp = BP_SYM (__sigsetjmp) ENTER movl JMPBUF(%esp), %eax |