| ! |
| ! setjmp.S |
| ! |
| ! Basic setjmp/longjmp |
| ! |
| ! This code was based on the equivalent code in NetBSD |
| ! |
| |
| #include <machine/asm.h> |
| |
| ! |
| ! The jmp_buf contains the following entries: |
| ! sp |
| ! fp |
| ! pc |
| ! |
| ENTRY(setjmp) |
| st %sp,[%o0+0] ! Callers stack pointer |
| st %o7,[%o0+4] ! Return pc |
| st %fp,[%o0+8] ! Frame pointer |
| retl ! Return |
| clr %o0 ! ...0 |
| |
| ENTRY(longjmp) |
| mov %o0,%g6 ! Save desired frame in a global register |
| mov %o1,%g1 ! Save return value in a global register |
| ld [%g6+4],%g7 ! Get callers frame |
| 1: |
| cmp %fp,%g7 ! Desired frame? |
| bl,a 1b ! Below... |
| restore ! pop the frame and loop |
| bne,a .L_botch ! If there... |
| ld [%g6+0],%o2 ! fetch return %sp |
| |
| cmp %o2,%sp ! %sp must not decrease |
| bl,a .L_botch |
| mov %o2,%sp ! If ok, put in place |
| |
| ld [%g6+8],%o3 ! Fetch return pc |
| jmp %o3 + 8 ! success; return %g1 |
| mov %g1,%o0 |
| |
| .L_botch: |
| unimp 0 ! Botched longjmp |
