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runtime: crash stack support for loong64

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Change-Id: Icc2641b888440cc27444b5dfb2b8ff286e6a595d
GitHub-Last-Rev: f5772e32e9190ab1eed94fcf2c9e58d6bc0d74d6
GitHub-Pull-Request: golang/go#63923
Reviewed-on: https://go-review.googlesource.com/c/go/+/539536
Reviewed-by: abner chenc <chenguoqi@loongson.cn>
Run-TryBot: Joel Sing <joel@sing.id.au>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
Mauri de Souza Meneguzzo 2024-01-25 23:11:02 +00:00 committed by Joel Sing
parent 99efe7c39e
commit f719d5cffd
3 changed files with 33 additions and 8 deletions
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2
src/runtime/asm.s
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@ -15,6 +15,7 @@ TEXT ·mapinitnoop<ABIInternal>(SB),NOSPLIT,$0-0
#ifndef GOARCH_amd64
#ifndef GOARCH_arm64
#ifndef GOARCH_loong64
#ifndef GOARCH_mips64
#ifndef GOARCH_mips64le
#ifndef GOARCH_ppc64
@ -34,3 +35,4 @@ TEXT ·switchToCrashStack0<ABIInternal>(SB),NOSPLIT,$0-0
#endif
#endif
#endif
#endif

37
src/runtime/asm_loong64.s
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@ -213,6 +213,29 @@ noswitch:
ADDV $8, R3
JMP (R4)
// func switchToCrashStack0(fn func())
TEXT runtime·switchToCrashStack0(SB), NOSPLIT, $0-8
MOVV fn+0(FP), REGCTXT // context register
MOVV g_m(g), R4 // curm
// set g to gcrash
MOVV $runtime·gcrash(SB), g // g = &gcrash
JAL runtime·save_g(SB)
MOVV R4, g_m(g) // g.m = curm
MOVV g, m_g0(R4) // curm.g0 = g
// switch to crashstack
MOVV (g_stack+stack_hi)(g), R4
ADDV $(-4*8), R4, R3
// call target function
MOVV 0(REGCTXT), R6
JAL (R6)
// should never return
JAL runtime·abort(SB)
UNDEF
/*
* support for morestack
*/
@ -226,6 +249,13 @@ 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.
MOVV R3, (g_sched+gobuf_sp)(g)
MOVV R1, (g_sched+gobuf_pc)(g)
MOVV R31, (g_sched+gobuf_lr)(g)
MOVV REGCTXT, (g_sched+gobuf_ctxt)(g)
// Cannot grow scheduler stack (m->g0).
MOVV g_m(g), R7
MOVV m_g0(R7), R8
@ -239,13 +269,6 @@ TEXT runtime·morestack(SB),NOSPLIT|NOFRAME,$0-0
JAL runtime·badmorestackgsignal(SB)
JAL runtime·abort(SB)
// Called from f.
// Set g->sched to context in f.
MOVV R3, (g_sched+gobuf_sp)(g)
MOVV R1, (g_sched+gobuf_pc)(g)
MOVV R31, (g_sched+gobuf_lr)(g)
MOVV REGCTXT, (g_sched+gobuf_ctxt)(g)
// Called from f.
// Set m->morebuf to f's caller.
MOVV R31, (m_morebuf+gobuf_pc)(R7) // 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 == "mips64" || GOARCH == "mips64le" || GOARCH == "ppc64" || GOARCH == "ppc64le" || GOARCH == "riscv64" || GOARCH == "s390x" || GOARCH == "wasm") && GOOS != "windows"
const crashStackImplemented = (GOARCH == "amd64" || 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