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runtime: add support for crash stack on ppc64/ppc64le

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Change-Id: I8d1011509c4f0f529e97055280606603747a2e1a
Reviewed-on: https://go-review.googlesource.com/c/go/+/541775
Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com>
Reviewed-by: Paul Murphy <murp@ibm.com>
Reviewed-by: David Chase <drchase@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Joel Sing <joel@sing.id.au>
This commit is contained in:
Joel Sing 2023-11-12 23:01:34 +11:00
parent 631a6c2abf
commit aa9dd50095
3 changed files with 38 additions and 9 deletions
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4
src/runtime/asm.s
View File

@ -17,6 +17,8 @@ TEXT ·mapinitnoop<ABIInternal>(SB),NOSPLIT,$0-0
#ifndef GOARCH_arm64
#ifndef GOARCH_mips64
#ifndef GOARCH_mips64le
#ifndef GOARCH_ppc64
#ifndef GOARCH_ppc64le
#ifndef GOARCH_riscv64
// stub to appease shared build mode.
TEXT ·switchToCrashStack0<ABIInternal>(SB),NOSPLIT,$0-0
@ -26,3 +28,5 @@ TEXT ·switchToCrashStack0<ABIInternal>(SB),NOSPLIT,$0-0
#endif
#endif
#endif
#endif
#endif

41
src/runtime/asm_ppc64x.s
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@ -284,6 +284,31 @@ noswitch:
#endif
RET
// func switchToCrashStack0(fn func())
TEXT runtime·switchToCrashStack0<ABIInternal>(SB), NOSPLIT, $0-8
MOVD R3, R11 // context register
MOVD g_m(g), R3 // curm
// set g to gcrash
MOVD $runtime·gcrash(SB), g // g = &gcrash
CALL runtime·save_g(SB) // clobbers R31
MOVD R3, g_m(g) // g.m = curm
MOVD g, m_g0(R3) // curm.g0 = g
// switch to crashstack
MOVD (g_stack+stack_hi)(g), R3
SUB $(4*8), R3
MOVD R3, R1
// call target function
MOVD 0(R11), R12 // code pointer
MOVD R12, CTR
BL (CTR)
// should never return
CALL runtime·abort(SB)
UNDEF
/*
* support for morestack
*/
@ -297,6 +322,14 @@ noswitch:
// calling the scheduler calling newm calling gc), so we must
// record an argument size. For that purpose, it has no arguments.
TEXT runtime·morestack(SB),NOSPLIT|NOFRAME,$0-0
// Called from f.
// Set g->sched to context in f.
MOVD R1, (g_sched+gobuf_sp)(g)
MOVD LR, R8
MOVD R8, (g_sched+gobuf_pc)(g)
MOVD R5, (g_sched+gobuf_lr)(g)
MOVD R11, (g_sched+gobuf_ctxt)(g)
// Cannot grow scheduler stack (m->g0).
MOVD g_m(g), R7
MOVD m_g0(R7), R8
@ -312,14 +345,6 @@ TEXT runtime·morestack(SB),NOSPLIT|NOFRAME,$0-0
BL runtime·badmorestackgsignal(SB)
BL runtime·abort(SB)
// Called from f.
// Set g->sched to context in f.
MOVD R1, (g_sched+gobuf_sp)(g)
MOVD LR, R8
MOVD R8, (g_sched+gobuf_pc)(g)
MOVD R5, (g_sched+gobuf_lr)(g)
MOVD R11, (g_sched+gobuf_ctxt)(g)
// Called from f.
// Set m->morebuf to f's caller.
MOVD R5, (m_morebuf+gobuf_pc)(R7) // f's caller's PC

2
src/runtime/proc.go
View File

@ -576,7 +576,7 @@ func switchToCrashStack(fn func()) {
abort()
}
const crashStackImplemented = GOARCH == "amd64" || GOARCH == "arm64" || GOARCH == "mips64" || GOARCH == "mips64le" || GOARCH == "riscv64"
const crashStackImplemented = GOARCH == "amd64" || GOARCH == "arm64" || GOARCH == "mips64" || GOARCH == "mips64le" || GOARCH == "ppc64" || GOARCH == "ppc64le" || GOARCH == "riscv64"
//go:noescape
func switchToCrashStack0(fn func()) // in assembly