diff options
Diffstat (limited to 'newlib/libc/sys/sysvi386/_longjmp.s')
| -rw-r--r-- | newlib/libc/sys/sysvi386/_longjmp.s | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/newlib/libc/sys/sysvi386/_longjmp.s b/newlib/libc/sys/sysvi386/_longjmp.s new file mode 100644 index 0000000..691409b --- /dev/null +++ b/newlib/libc/sys/sysvi386/_longjmp.s @@ -0,0 +1,31 @@ +/ +/ our buffer looks like: +/ eax,ebx,ecx,edx,esi,edi,esp,ebp,pc +/ +/ _longjmp is called with two parameters: jmp_buf*,int +/ jmp_buf* is at 4(%esp), int is at 8(%esp) +/ retaddr is, of course, at (%esp) + + .globl _longjmp + .globl longjmp +_longjmp: +longjmp: + movl 4(%esp), %ebx / address of buf + movl 8(%esp), %eax / store return value + + movl 24(%ebx), %esp / restore stack + movl 32(%ebx), %edi +/ Next line sets up return address. + movl %edi, 0(%esp) + movl 8(%ebx), %ecx + movl 12(%ebx), %edx + movl 16(%ebx), %esi + movl 20(%ebx), %edi + movl 28(%ebx), %ebp + movl 4(%ebx), %ebx + testl %eax,%eax + jne bye + incl %eax / eax hold 0 if we are here +bye: + ret + |