diff options
Diffstat (limited to 'src/runtime/sys_linux_ppc64x.s')
| -rw-r--r-- | src/runtime/sys_linux_ppc64x.s | 86 |
1 files changed, 73 insertions, 13 deletions
diff --git a/src/runtime/sys_linux_ppc64x.s b/src/runtime/sys_linux_ppc64x.s index fd69ee70a5..7be8c4c724 100644 --- a/src/runtime/sys_linux_ppc64x.s +++ b/src/runtime/sys_linux_ppc64x.s @@ -215,15 +215,45 @@ TEXT runtime·walltime1(SB),NOSPLIT,$16-12 MOVD (g_sched+gobuf_sp)(R7), R1 // Set SP to g0 stack noswitch: - SUB $16, R1 // Space for results - RLDICR $0, R1, $59, R1 // Align for C code + SUB $16, R1 // Space for results + RLDICR $0, R1, $59, R1 // Align for C code MOVD R12, CTR MOVD R1, R4 - BL (CTR) // Call from VDSO - MOVD $0, R0 // Restore R0 - MOVD 0(R1), R3 // sec - MOVD 8(R1), R5 // nsec - MOVD R15, R1 // Restore SP + + // Store g on gsignal's stack, so if we receive a signal + // during VDSO code we can find the g. + // If we don't have a signal stack, we won't receive signal, + // so don't bother saving g. + // When using cgo, we already saved g on TLS, also don't save + // g here. + // Also don't save g if we are already on the signal stack. + // We won't get a nested signal. + MOVBZ runtime·iscgo(SB), R22 + CMP R22, $0 + BNE nosaveg + MOVD m_gsignal(R21), R22 // g.m.gsignal + CMP R22, $0 + BEQ nosaveg + + CMP g, R22 + BEQ nosaveg + MOVD (g_stack+stack_lo)(R22), R22 // g.m.gsignal.stack.lo + MOVD g, (R22) + + BL (CTR) // Call from VDSO + + MOVD $0, (R22) // clear g slot, R22 is unchanged by C code + + JMP finish + +nosaveg: + BL (CTR) // Call from VDSO + +finish: + MOVD $0, R0 // Restore R0 + MOVD 0(R1), R3 // sec + MOVD 8(R1), R5 // nsec + MOVD R15, R1 // Restore SP // Restore vdsoPC, vdsoSP // We don't worry about being signaled between the two stores. @@ -235,7 +265,7 @@ noswitch: MOVD 32(R1), R6 MOVD R6, m_vdsoPC(R21) -finish: +return: MOVD R3, sec+0(FP) MOVW R5, nsec+8(FP) RET @@ -246,7 +276,7 @@ fallback: SYSCALL $SYS_clock_gettime MOVD 32(R1), R3 MOVD 40(R1), R5 - JMP finish + JMP return TEXT runtime·nanotime1(SB),NOSPLIT,$16-8 MOVD $1, R3 // CLOCK_MONOTONIC @@ -282,7 +312,37 @@ noswitch: RLDICR $0, R1, $59, R1 // Align for C code MOVD R12, CTR MOVD R1, R4 - BL (CTR) // Call from VDSO + + // Store g on gsignal's stack, so if we receive a signal + // during VDSO code we can find the g. + // If we don't have a signal stack, we won't receive signal, + // so don't bother saving g. + // When using cgo, we already saved g on TLS, also don't save + // g here. + // Also don't save g if we are already on the signal stack. + // We won't get a nested signal. + MOVBZ runtime·iscgo(SB), R22 + CMP R22, $0 + BNE nosaveg + MOVD m_gsignal(R21), R22 // g.m.gsignal + CMP R22, $0 + BEQ nosaveg + + CMP g, R22 + BEQ nosaveg + MOVD (g_stack+stack_lo)(R22), R22 // g.m.gsignal.stack.lo + MOVD g, (R22) + + BL (CTR) // Call from VDSO + + MOVD $0, (R22) // clear g slot, R22 is unchanged by C code + + JMP finish + +nosaveg: + BL (CTR) // Call from VDSO + +finish: MOVD $0, R0 // Restore R0 MOVD 0(R1), R3 // sec MOVD 8(R1), R5 // nsec @@ -298,7 +358,7 @@ noswitch: MOVD 32(R1), R6 MOVD R6, m_vdsoPC(R21) -finish: +return: // sec is in R3, nsec in R5 // return nsec in R3 MOVD $1000000000, R4 @@ -313,7 +373,7 @@ fallback: SYSCALL $SYS_clock_gettime MOVD 32(R1), R3 MOVD 40(R1), R5 - JMP finish + JMP return TEXT runtime·rtsigprocmask(SB),NOSPLIT|NOFRAME,$0-28 MOVW how+0(FP), R3 @@ -366,7 +426,7 @@ TEXT sigtramp<>(SB),NOSPLIT,$64 // this might be called in external code context, // where g is not set. MOVBZ runtime·iscgo(SB), R6 - CMP R6, $0 + CMP R6, $0 BEQ 2(PC) BL runtime·load_g(SB) |