| ! |
| ! setjmp.S |
| ! |
| ! Basic setjmp/longjmp |
| ! |
| ! This code was based on the equivalent code in NetBSD |
| ! |
| |
| #include <machine/asm.h> |
| #include <machine/trap.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) |
| sub %sp, 64, %sp ! set up a local stack frame |
| 0: |
| t ST_FLUSHWIN ! flush register windows out to memory |
| ! |
| ! We restore the saved stack pointer to %fp, then issue |
| ! a restore instruction which will reload the register |
| ! window from the stack. |
| ! |
| ld [%o0+4], %o7 /* restore return pc */ |
| ld [%o0+0], %fp /* and stack pointer */ |
| |
| retl ! success, return %g6 |
| restore %o1, 0, %o0 |
