diff options
Diffstat (limited to 'sysdeps/i386/setjmp.S')
| -rw-r--r-- | sysdeps/i386/setjmp.S | 29 |
1 files changed, 21 insertions, 8 deletions
diff --git a/sysdeps/i386/setjmp.S b/sysdeps/i386/setjmp.S index a07d6f1..ccb7147 100644 --- a/sysdeps/i386/setjmp.S +++ b/sysdeps/i386/setjmp.S @@ -24,13 +24,26 @@ Cambridge, MA 02139, USA. */ ENTRY (__sigsetjmp) movl 4(%esp), %eax /* User's jmp_buf in %eax. */ /* Save registers. */ - movl %ebx, JB_BX(%eax) - movl %esi, JB_SI(%eax) - movl %edi, JB_DI(%eax) - movl %ebp, JB_BP(%eax) + movl %ebx, (JB_BX*4)(%eax) + movl %esi, (JB_SI*4)(%eax) + movl %edi, (JB_DI*4)(%eax) + movl %ebp, (JB_BP*4)(%eax) leal 4(%esp), %ecx /* Save SP as it will be after we return. */ - movl %ecx, JB_SP(%eax) + movl %ecx, (JB_SP*4)(%eax) movl 0(%esp), %ecx /* Save PC we are returning to now. */ - movl %ecx, JB_PC(%eax) - xorl %eax, %eax /* Return zero. */ - ret + movl %ecx, (JB_PC*4)(%eax) + + /* Make a tail call to __sigjmp_save; it takes the same args. */ +#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 here +here: popl %ecx + addl $_GLOBAL_OFFSET_TABLE_+[.-here], %ecx + movl C_SYMBOL_NAME(__sigjmp_save@GOT)(%ecx), %ecx + jmp *%ecx +#else + jmp __sigjmp_save +#endif |