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runtime: Save G on signal stack for nanotime1 vdso

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This commit is contained in:
Derek Parker 2021-06-17 10:58:31 -07:00
parent 1acaa2b4b9
commit c3002bcfca
1 changed files with 33 additions and 3 deletions
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36
src/runtime/sys_linux_ppc64x.s
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@ -313,7 +313,37 @@ 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
@ -329,7 +359,7 @@ 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
@ -344,7 +374,7 @@ 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