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| author | Andrew <andybons@golang.org> | 2020-08-11 11:03:03 -0400 |
|---|---|---|
| committer | Andrew Bonventre <andybons@golang.org> | 2020-08-11 17:05:57 +0000 |
| commit | cbc69e89b17188b3633bafa9d6e6c44f7f1a2ec0 (patch) | |
| tree | 7808aa129ba880f9b8b85b5efc51d1d1f5bc7aa8 /src/runtime/sys_linux_arm.s | |
| parent | c4f8cb43caf0bcd0c730d7d04a3fce129393cecc (diff) | |
| download | go-cbc69e89b17188b3633bafa9d6e6c44f7f1a2ec0.tar.xz | |
[release-branch.go1.15] all: merge master into release-branch.go1.15
5c7748dc9d doc/go1.15: encoding/json's CL 191783 was reverted
5ff5b3c557 doc/go1.15: remove draft notice
5ae1d62ee3 CONTRIBUTORS: update for the Go 1.15 release
7ad776dda5 doc/go1.15: document crypto/tls permanent error
a93a4c1780 runtime: make nanotime1 reentrant
Updates #40697
Change-Id: Ie39896ee6304544cc9e9c1938bdf176f1dcf8766
Reviewed-on: https://go-review.googlesource.com/c/go/+/247900
Run-TryBot: Andrew Bonventre <andybons@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Diffstat (limited to 'src/runtime/sys_linux_arm.s')
| -rw-r--r-- | src/runtime/sys_linux_arm.s | 36 |
1 files changed, 32 insertions, 4 deletions
diff --git a/src/runtime/sys_linux_arm.s b/src/runtime/sys_linux_arm.s index e103da56dc..475f52344c 100644 --- a/src/runtime/sys_linux_arm.s +++ b/src/runtime/sys_linux_arm.s @@ -242,7 +242,7 @@ TEXT runtime·mincore(SB),NOSPLIT,$0 MOVW R0, ret+12(FP) RET -TEXT runtime·walltime1(SB),NOSPLIT,$0-12 +TEXT runtime·walltime1(SB),NOSPLIT,$8-12 // We don't know how much stack space the VDSO code will need, // so switch to g0. @@ -252,6 +252,13 @@ TEXT runtime·walltime1(SB),NOSPLIT,$0-12 MOVW g_m(g), R5 // R5 is unchanged by C code. // Set vdsoPC and vdsoSP for SIGPROF traceback. + // Save the old values on stack and restore them on exit, + // so this function is reentrant. + MOVW m_vdsoPC(R5), R1 + MOVW m_vdsoSP(R5), R2 + MOVW R1, 4(R13) + MOVW R2, 8(R13) + MOVW LR, m_vdsoPC(R5) MOVW R13, m_vdsoSP(R5) @@ -312,8 +319,15 @@ finish: MOVW 12(R13), R2 // nsec MOVW R4, R13 // Restore real SP - MOVW $0, R1 + // 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. + MOVW 8(R13), R1 MOVW R1, m_vdsoSP(R5) + MOVW 4(R13), R1 + MOVW R1, m_vdsoPC(R5) MOVW R0, sec_lo+0(FP) MOVW R1, sec_hi+4(FP) @@ -321,7 +335,7 @@ finish: RET // int64 nanotime1(void) -TEXT runtime·nanotime1(SB),NOSPLIT,$0-8 +TEXT runtime·nanotime1(SB),NOSPLIT,$8-8 // Switch to g0 stack. See comment above in runtime·walltime. // Save old SP. Use R13 instead of SP to avoid linker rewriting the offsets. @@ -330,6 +344,13 @@ TEXT runtime·nanotime1(SB),NOSPLIT,$0-8 MOVW g_m(g), R5 // R5 is unchanged by C code. // Set vdsoPC and vdsoSP for SIGPROF traceback. + // Save the old values on stack and restore them on exit, + // so this function is reentrant. + MOVW m_vdsoPC(R5), R1 + MOVW m_vdsoSP(R5), R2 + MOVW R1, 4(R13) + MOVW R2, 8(R13) + MOVW LR, m_vdsoPC(R5) MOVW R13, m_vdsoSP(R5) @@ -390,8 +411,15 @@ finish: MOVW 12(R13), R2 // nsec MOVW R4, R13 // Restore real SP - MOVW $0, R4 + // 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. + MOVW 8(R13), R4 MOVW R4, m_vdsoSP(R5) + MOVW 4(R13), R4 + MOVW R4, m_vdsoPC(R5) MOVW $1000000000, R3 MULLU R0, R3, (R1, R0) |