diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/i386/____longjmp_chk.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/____longjmp_chk.S | 73 |
1 files changed, 21 insertions, 52 deletions
diff --git a/sysdeps/unix/sysv/linux/i386/____longjmp_chk.S b/sysdeps/unix/sysv/linux/i386/____longjmp_chk.S index b07e972468..65c7bae9f2 100644 --- a/sysdeps/unix/sysv/linux/i386/____longjmp_chk.S +++ b/sysdeps/unix/sysv/linux/i386/____longjmp_chk.S @@ -58,8 +58,6 @@ ENTRY (____longjmp_chk) PTR_DEMANGLE (%edx) PTR_DEMANGLE (%edi) - pushl $0 - cfi_adjust_cfa_offset(4) cmpl %edi, %esp jbe .Lok @@ -69,15 +67,25 @@ ENTRY (____longjmp_chk) movl %esp, %ecx movl $__NR_sigaltstack, %eax ENTER_KERNEL - movl 4(%esp), %ebx - addl $12, %esp + /* Without working sigaltstack we cannot perform the test. */ + test %eax, %eax + jne .Lok2 + testl $1, 4(%esp) + jz .Lfail + + movl (%esp), %eax + addl 8(%esp), %eax + subl %edi, %eax + cmpl 8(%esp), %eax + jae .Lok2 + +.Lfail: CALL_FAIL + +.Lok2: addl $12, %esp cfi_adjust_cfa_offset(-12) - movl 8(%esp), %ecx - testl %eax, %eax - jne .Lok - andl $1, %ebx - movl %ebx, (%esp) -.Lok: + movl 4(%esp), %ecx + +.Lok: /* We add unwind information for the target here. */ cfi_def_cfa(%ecx, 0) cfi_register(%eip, %edx) cfi_register(%esp, %edi) @@ -86,15 +94,11 @@ ENTRY (____longjmp_chk) cfi_offset(%edi, JB_DI*4) cfi_offset(%ebp, JB_BP*4) - movl 12(%esp), %eax /* Second argument is return value. */ - xchgl %edi, %esp - cfi_restore(%edi) - - cmpl %esp, %edi - jnbe .Lcheck + movl 8(%esp), %eax /* Second argument is return value. */ + movl %edi, %esp /* Restore registers. */ -.Lout: movl (JB_BX*4)(%ecx), %ebx + movl (JB_BX*4)(%ecx), %ebx movl (JB_SI*4)(%ecx), %esi movl (JB_DI*4)(%ecx), %edi movl (JB_BP*4)(%ecx), %ebp @@ -105,39 +109,4 @@ ENTRY (____longjmp_chk) /* Jump to saved PC. */ jmp *%edx - - cfi_def_cfa(%ecx, 0) - cfi_register(%eip, %edx) - cfi_offset(%ebx, JB_BX*4) - cfi_offset(%esi, JB_SI*4) - cfi_offset(%edi, JB_DI*4) - cfi_offset(%ebp, JB_BP*4) - -.Lcheck: - cmpl $0, (%edi) - je .Lfail - - subl $12, %esp - cfi_adjust_cfa_offset(12) - xorl %ebx, %ebx - movl %esp, %ecx - movl $__NR_sigaltstack, %eax - ENTER_KERNEL - testl $1, 4(%esp) - leal 12(%esp), %esp - movl 8(%edi), %ecx - movl 12(%edi), %eax - cfi_adjust_cfa_offset(-12) - je .Lout - -.Lfail: xchgl %edi, %esp - cfi_def_cfa(%esp, 8) - cfi_restore(%esp) - cfi_restore(%ebx) - cfi_restore(%esi) - cfi_undefined(%edi) - cfi_restore(%ebp) - - CALL_FAIL - hlt END (____longjmp_chk) |