diff options
Diffstat (limited to 'src/pkg/runtime/asm_386.s')
| -rw-r--r-- | src/pkg/runtime/asm_386.s | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/src/pkg/runtime/asm_386.s b/src/pkg/runtime/asm_386.s index aafe960ce3..3c46b40fee 100644 --- a/src/pkg/runtime/asm_386.s +++ b/src/pkg/runtime/asm_386.s @@ -205,18 +205,26 @@ TEXT runtime·switchtoM(SB), NOSPLIT, $0-4 RET // func onM(fn func()) -// calls fn() on the M stack. -// switches to the M stack if not already on it, and -// switches back when fn() returns. TEXT runtime·onM(SB), NOSPLIT, $0-4 MOVL fn+0(FP), DI // DI = fn get_tls(CX) MOVL g(CX), AX // AX = g MOVL g_m(AX), BX // BX = m + MOVL m_g0(BX), DX // DX = g0 CMPL AX, DX JEQ onm + MOVL m_curg(BX), BP + CMPL AX, BP + JEQ oncurg + + // Not g0, not curg. Must be gsignal, but that's not allowed. + // Hide call from linker nosplit analysis. + MOVL $runtime·badonm(SB), AX + CALL AX + +oncurg: // save our state in g->sched. Pretend to // be switchtoM if the G stack is scanned. MOVL $runtime·switchtoM(SB), (g_sched+gobuf_pc)(AX) |