diff options
Diffstat (limited to 'src/runtime/asm_amd64.s')
| -rw-r--r-- | src/runtime/asm_amd64.s | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/runtime/asm_amd64.s b/src/runtime/asm_amd64.s index 2d8f4c2412..0f719b2664 100644 --- a/src/runtime/asm_amd64.s +++ b/src/runtime/asm_amd64.s @@ -662,6 +662,21 @@ TEXT ·publicationBarrier(SB),NOSPLIT,$0-0 // compile barrier. RET +// func jmpdefer(fv func(), argp uintptr) +// argp is a caller SP. +// called from deferreturn. +// 1. pop the caller +// 2. sub 5 bytes from the callers return +// 3. jmp to the argument +TEXT runtime·jmpdefer(SB), NOSPLIT, $0-16 + MOVQ fv+0(FP), DX // fn + MOVQ argp+8(FP), BX // caller sp + LEAQ -8(BX), SP // caller sp after CALL + MOVQ -8(SP), BP // restore BP as if deferreturn returned (harmless if framepointers not in use) + SUBQ $5, (SP) // return to CALL again + MOVQ 0(DX), BX + JMP BX // but first run the deferred function + // Save state of caller into g->sched, // but using fake PC from systemstack_switch. // Must only be called from functions with no locals ($0) |