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runtime: fix 386 signal handler bug

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Cannot assume that g == m->curg at time of signal.
Must save actual g and restore.

Fixes flaky crashes with messages like

throw: malloc mlookup
throw: malloc/free - deadlock
throw: unwindstack on self
throw: free mlookup

(and probably others) when running cgo.

R=iant
CC=golang-dev
https://golang.org/cl/1648043
This commit is contained in:
Russ Cox 2010-06-12 10:48:04 -07:00
parent 9d72aaabda
commit 53a529ab2b
2 changed files with 35 additions and 15 deletions
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12
src/pkg/runtime/darwin/386/sys.s
View File

@ -74,8 +74,13 @@ TEXT sigaction(SB),7,$0
// 16(FP) siginfo // 16(FP) siginfo
// 20(FP) context // 20(FP) context
TEXT sigtramp(SB),7,$40 TEXT sigtramp(SB),7,$40
// g = m->gsignal
get_tls(CX) get_tls(CX)
// save g
MOVL g(CX), BP
MOVL BP, 20(SP)
// g = m->gsignal
MOVL m(CX), BP MOVL m(CX), BP
MOVL m_gsignal(BP), BP MOVL m_gsignal(BP), BP
MOVL BP, g(CX) MOVL BP, g(CX)
@ -91,10 +96,9 @@ TEXT sigtramp(SB),7,$40
MOVL CX, 8(SP) MOVL CX, 8(SP)
CALL DI CALL DI
// g = m->curg // restore g
get_tls(CX) get_tls(CX)
MOVL m(CX), BP MOVL 20(SP), BP
MOVL m_curg(BP), BP
MOVL BP, g(CX) MOVL BP, g(CX)
MOVL context+16(FP), CX MOVL context+16(FP), CX

38
src/pkg/runtime/linux/386/sys.s
View File

@ -56,22 +56,39 @@ TEXT rt_sigaction(SB),7,$0
INT $0x80 INT $0x80
RET RET
TEXT sigtramp(SB),7,$0 TEXT sigtramp(SB),7,$40
get_tls(CX) get_tls(CX)
MOVL m(CX), BP
MOVL m_gsignal(BP), AX // save g
MOVL AX, g(CX) MOVL g(CX), BX
JMP sighandler(SB) MOVL BX, 20(SP)
// g = m->gsignal
MOVL m(CX), BX
MOVL m_gsignal(BX), BX
MOVL BX, g(CX)
// copy arguments for call to sighandler
MOVL sig+0(FP), BX
MOVL BX, 0(SP)
MOVL info+4(FP), BX
MOVL BX, 4(SP)
MOVL context+8(FP), BX
MOVL BX, 8(SP)
CALL sighandler(SB)
// restore g
get_tls(CX)
MOVL 20(SP), BX
MOVL BX, g(CX)
RET
TEXT sigignore(SB),7,$0 TEXT sigignore(SB),7,$0
RET RET
TEXT sigreturn(SB),7,$0 TEXT sigreturn(SB),7,$0
// g = m->curg
get_tls(CX)
MOVL m(CX), BP
MOVL m_curg(BP), BP
MOVL BP, g(CX)
MOVL $173, AX // rt_sigreturn MOVL $173, AX // rt_sigreturn
INT $0x80 INT $0x80
INT $3 // not reached INT $3 // not reached
@ -259,4 +276,3 @@ TEXT setldt(SB),7,$32
MOVW AX, GS MOVW AX, GS
RET RET