diff options
Diffstat (limited to 'src/runtime/time_linux_amd64.s')
| -rw-r--r-- | src/runtime/time_linux_amd64.s | 37 |
1 files changed, 19 insertions, 18 deletions
diff --git a/src/runtime/time_linux_amd64.s b/src/runtime/time_linux_amd64.s index c88e92bd0ca..67cfdd8fdff 100644 --- a/src/runtime/time_linux_amd64.s +++ b/src/runtime/time_linux_amd64.s @@ -12,14 +12,11 @@ #define SYS_clock_gettime 228 // func time.now() (sec int64, nsec int32, mono int64) -TEXT time·now(SB),NOSPLIT,$16-24 +TEXT time·now<ABIInternal>(SB),NOSPLIT,$16-24 MOVQ SP, R12 // Save old SP; R12 unchanged by C code. MOVQ g_m(R14), BX // BX unchanged by C code. - // Store CLOCK_REALTIME results directly to return space. - LEAQ sec+0(FP), SI - // Set vdsoPC and vdsoSP for SIGPROF traceback. // Save the old values on stack and restore them on exit, // so this function is reentrant. @@ -28,9 +25,10 @@ TEXT time·now(SB),NOSPLIT,$16-24 MOVQ CX, 0(SP) MOVQ DX, 8(SP) - MOVQ -8(SI), CX // Sets CX to function return address. + LEAQ sec+0(FP), DX + MOVQ -8(DX), CX // Sets CX to function return address. MOVQ CX, m_vdsoPC(BX) - MOVQ SI, m_vdsoSP(BX) + MOVQ DX, m_vdsoSP(BX) CMPQ R14, m_curg(BX) // Only switch if on curg. JNE noswitch @@ -39,10 +37,11 @@ TEXT time·now(SB),NOSPLIT,$16-24 MOVQ (g_sched+gobuf_sp)(DX), SP // Set SP to g0 stack noswitch: - SUBQ $16, SP // Space for monotonic time results + SUBQ $32, SP // Space for two time results ANDQ $~15, SP // Align for C code MOVL $0, DI // CLOCK_REALTIME + LEAQ 16(SP), SI MOVQ runtime·vdsoClockgettimeSym(SB), AX CMPQ AX, $0 JEQ fallback @@ -54,25 +53,27 @@ noswitch: CALL AX ret: - MOVQ 0(SP), AX // sec - MOVQ 8(SP), DX // nsec + MOVQ 16(SP), AX // realtime sec + MOVQ 24(SP), DI // realtime nsec (moved to BX below) + MOVQ 0(SP), CX // monotonic sec + IMULQ $1000000000, CX + MOVQ 8(SP), DX // monotonic nsec MOVQ R12, SP // Restore real SP + // Restore vdsoPC, vdsoSP // We don't worry about being signaled between the two stores. // If we are not in a signal handler, we'll restore vdsoSP to 0, // and no one will care about vdsoPC. If we are in a signal handler, // we cannot receive another signal. - MOVQ 8(SP), CX - MOVQ CX, m_vdsoSP(BX) - MOVQ 0(SP), CX - MOVQ CX, m_vdsoPC(BX) + MOVQ 8(SP), SI + MOVQ SI, m_vdsoSP(BX) + MOVQ 0(SP), SI + MOVQ SI, m_vdsoPC(BX) - // sec is in AX, nsec in DX - // return nsec in AX - IMULQ $1000000000, AX - ADDQ DX, AX - MOVQ AX, mono+16(FP) + // set result registers; AX is already correct + MOVQ DI, BX + ADDQ DX, CX RET fallback: |