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runtime: add crash stack support for arm

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Change-Id: Ide4002d1cf82f2daaf7261b367c391dedbbf7719
GitHub-Last-Rev: 80ee248c3e
GitHub-Pull-Request: golang/go#65308
Reviewed-on: https://go-review.googlesource.com/c/go/+/558699
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
This commit is contained in:
Mauri de Souza Meneguzzo 2024-02-23 01:06:40 +00:00 committed by Michael Pratt
parent e58486e599
commit 727e8d3863
3 changed files with 35 additions and 8 deletions
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2
src/runtime/asm.s
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@ -13,6 +13,7 @@ TEXT ·sigpanic0(SB),NOSPLIT,$0-0
TEXT ·mapinitnoop<ABIInternal>(SB),NOSPLIT,$0-0
RET
#ifndef GOARCH_arm
#ifndef GOARCH_amd64
#ifndef GOARCH_arm64
#ifndef GOARCH_loong64
@ -36,3 +37,4 @@ TEXT ·switchToCrashStack0<ABIInternal>(SB),NOSPLIT,$0-0
#endif
#endif
#endif
#endif

39
src/runtime/asm_arm.s
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@ -333,6 +333,30 @@ noswitch:
MOVW.P 4(R13), R14 // restore LR
B (R0)
// func switchToCrashStack0(fn func())
TEXT runtime·switchToCrashStack0(SB), NOSPLIT, $0-4
MOVW fn+0(FP), R7 // context register
MOVW g_m(g), R1 // curm
// set g to gcrash
MOVW $runtime·gcrash(SB), R0
BL setg<>(SB) // g = &gcrash
MOVW R1, g_m(g) // g.m = curm
MOVW g, m_g0(R1) // curm.g0 = g
// switch to crashstack
MOVW (g_stack+stack_hi)(g), R1
SUB $(4*8), R1
MOVW R1, R13
// call target function
MOVW 0(R7), R0
BL (R0)
// should never return
CALL runtime·abort(SB)
UNDEF
/*
* support for morestack
*/
@ -349,6 +373,14 @@ TEXT runtime·morestack(SB),NOSPLIT|NOFRAME,$0-0
// Cannot grow scheduler stack (m->g0).
MOVW g_m(g), R8
MOVW m_g0(R8), R4
// Called from f.
// Set g->sched to context in f.
MOVW R13, (g_sched+gobuf_sp)(g)
MOVW LR, (g_sched+gobuf_pc)(g)
MOVW R3, (g_sched+gobuf_lr)(g)
MOVW R7, (g_sched+gobuf_ctxt)(g)
CMP g, R4
BNE 3(PC)
BL runtime·badmorestackg0(SB)
@ -361,13 +393,6 @@ TEXT runtime·morestack(SB),NOSPLIT|NOFRAME,$0-0
BL runtime·badmorestackgsignal(SB)
B runtime·abort(SB)
// Called from f.
// Set g->sched to context in f.
MOVW R13, (g_sched+gobuf_sp)(g)
MOVW LR, (g_sched+gobuf_pc)(g)
MOVW R3, (g_sched+gobuf_lr)(g)
MOVW R7, (g_sched+gobuf_ctxt)(g)
// Called from f.
// Set m->morebuf to f's caller.
MOVW R3, (m_morebuf+gobuf_pc)(R8) // f's caller's PC

2
src/runtime/proc.go
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@ -579,7 +579,7 @@ func switchToCrashStack(fn func()) {
// Disable crash stack on Windows for now. Apparently, throwing an exception
// on a non-system-allocated crash stack causes EXCEPTION_STACK_OVERFLOW and
// hangs the process (see issue 63938).
const crashStackImplemented = (GOARCH == "amd64" || GOARCH == "arm64" || GOARCH == "loong64" || GOARCH == "mips64" || GOARCH == "mips64le" || GOARCH == "ppc64" || GOARCH == "ppc64le" || GOARCH == "riscv64" || GOARCH == "s390x" || GOARCH == "wasm") && GOOS != "windows"
const crashStackImplemented = (GOARCH == "amd64" || GOARCH == "arm" || GOARCH == "arm64" || GOARCH == "loong64" || GOARCH == "mips64" || GOARCH == "mips64le" || GOARCH == "ppc64" || GOARCH == "ppc64le" || GOARCH == "riscv64" || GOARCH == "s390x" || GOARCH == "wasm") && GOOS != "windows"
//go:noescape
func switchToCrashStack0(fn func()) // in assembly