diff options
Diffstat (limited to 'src/runtime/asm_ppc64x.s')
| -rw-r--r-- | src/runtime/asm_ppc64x.s | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/src/runtime/asm_ppc64x.s b/src/runtime/asm_ppc64x.s index 5dc96c5947..a789d041e4 100644 --- a/src/runtime/asm_ppc64x.s +++ b/src/runtime/asm_ppc64x.s @@ -503,6 +503,34 @@ again: OR R6, R6, R6 // Set PPR priority back to medium-low RET +// void jmpdefer(fv, sp); +// called from deferreturn. +// 1. grab stored LR for caller +// 2. sub 8 bytes to get back to either nop or toc reload before deferreturn +// 3. BR to fn +// When dynamically linking Go, it is not sufficient to rewind to the BL +// deferreturn -- we might be jumping between modules and so we need to reset +// the TOC pointer in r2. To do this, codegen inserts MOVD 24(R1), R2 *before* +// the BL deferreturn and jmpdefer rewinds to that. +TEXT runtime·jmpdefer(SB), NOSPLIT|NOFRAME, $0-16 + MOVD 0(R1), R31 + SUB $8, R31 + MOVD R31, LR + + MOVD fv+0(FP), R11 + MOVD argp+8(FP), R1 + SUB $FIXED_FRAME, R1 +#ifdef GOOS_aix + // AIX won't trigger a SIGSEGV if R11 = nil + // So it manually triggers it + CMP R0, R11 + BNE 2(PC) + MOVD R0, 0(R0) +#endif + MOVD 0(R11), R12 + MOVD R12, CTR + BR (CTR) + // Save state of caller into g->sched, // but using fake PC from systemstack_switch. // Must only be called from functions with no locals ($0) |