runtime: crash stack support for loong64

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>

diff --git a/src/runtime/asm.s b/src/runtime/asm.s
index 74ae8789abc92245e69670583d8d5b0fc669e2a4..4833fae5e964900b09bc8660b893d64cfdf4a0f3 100644 (file)
--- a/src/runtime/asm.s
+++ b/src/runtime/asm.s
@@ -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

diff --git a/src/runtime/asm_loong64.s b/src/runtime/asm_loong64.s
index 586bd23ed4781e7cad03a557cf9d144f81631b2f..7c5ecb8a01192ed6d04a2884d31aa1c7f66bb13c 100644 (file)
--- a/src/runtime/asm_loong64.s
+++ b/src/runtime/asm_loong64.s
@@ -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

diff --git a/src/runtime/proc.go b/src/runtime/proc.go
index b3caeb9a7c2536b93115e3ede4432e0f0fc771af..c1b3ce20d513daeb388dd779b06d43c868ce106e 100644 (file)
--- a/src/runtime/proc.go
+++ b/src/runtime/proc.go
@@ -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