runtime: add crash stack support for mips/mipsle

Change-Id: Ic6fcdfb6a9a912a9b1dd268836d2e5ab44d80440
GitHub-Last-Rev: dab6ecc0660d3e0f8e23944286f965a3bb15b4cb
GitHub-Pull-Request: golang/go#65305
Reviewed-on: https://go-review.googlesource.com/c/go/+/558698
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Mauri de Souza Meneguzzo <mauri870@gmail.com>

diff --git a/src/runtime/asm.s b/src/runtime/asm.s
index 75b3013f4b31713df0f45fce52b2ad72a69f2056..b4bcb04cd1dd582ac49e8cf0050ab7fc28eccbe1 100644 (file)
--- a/src/runtime/asm.s
+++ b/src/runtime/asm.s
@@ -18,6 +18,8 @@ TEXT ·mapinitnoop<ABIInternal>(SB),NOSPLIT,$0-0
 #ifndef GOARCH_amd64
 #ifndef GOARCH_arm64
 #ifndef GOARCH_loong64
+#ifndef GOARCH_mips
+#ifndef GOARCH_mipsle
 #ifndef GOARCH_mips64
 #ifndef GOARCH_mips64le
 #ifndef GOARCH_ppc64
@@ -40,3 +42,5 @@ TEXT ·switchToCrashStack0<ABIInternal>(SB),NOSPLIT,$0-0
 #endif
 #endif
 #endif
+#endif
+#endif

diff --git a/src/runtime/asm_mipsx.s b/src/runtime/asm_mipsx.s
index eed4a05b38b91a4b3416b9386babdacc746feae2..ca95f22bd67f4697781f261cd202dafb2dff693b 100644 (file)
--- a/src/runtime/asm_mipsx.s
+++ b/src/runtime/asm_mipsx.s
@@ -204,6 +204,29 @@ noswitch:
        ADD     $4, R29
        JMP     (R4)
 
+// func switchToCrashStack0(fn func())
+TEXT runtime·switchToCrashStack0(SB), NOSPLIT, $0-4
+       MOVW    fn+0(FP), REGCTXT       // context register
+       MOVW    g_m(g), R2      // curm
+
+       // set g to gcrash
+       MOVW    $runtime·gcrash(SB), g // g = &gcrash
+       CALL    runtime·save_g(SB)
+       MOVW    R2, g_m(g)      // g.m = curm
+       MOVW    g, m_g0(R2)     // curm.g0 = g
+
+       // switch to crashstack
+       MOVW    (g_stack+stack_hi)(g), R2
+       ADDU    $(-4*8), R2, R29
+
+       // call target function
+       MOVW    0(REGCTXT), R25
+       JAL     (R25)
+
+       // should never return
+       CALL    runtime·abort(SB)
+       UNDEF
+
 /*
  * support for morestack
  */
@@ -217,6 +240,13 @@ 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.
+       MOVW    R29, (g_sched+gobuf_sp)(g)
+       MOVW    R31, (g_sched+gobuf_pc)(g)
+       MOVW    R3, (g_sched+gobuf_lr)(g)
+       MOVW    REGCTXT, (g_sched+gobuf_ctxt)(g)
+
        // Cannot grow scheduler stack (m->g0).
        MOVW    g_m(g), R7
        MOVW    m_g0(R7), R8
@@ -230,13 +260,6 @@ 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.
-       MOVW    R29, (g_sched+gobuf_sp)(g)
-       MOVW    R31, (g_sched+gobuf_pc)(g)
-       MOVW    R3, (g_sched+gobuf_lr)(g)
-       MOVW    REGCTXT, (g_sched+gobuf_ctxt)(g)
-
        // Called from f.
        // Set m->morebuf to f's caller.
        MOVW    R3, (m_morebuf+gobuf_pc)(R7)    // f's caller's PC

diff --git a/src/runtime/proc.go b/src/runtime/proc.go
index 56f97fa9f7b729ad3b029912c81f946dbafe125d..387c4598bb82d7aa911774aa4e5c7c6f58b7729a 100644 (file)
--- a/src/runtime/proc.go
+++ b/src/runtime/proc.go
@@ -578,7 +578,7 @@ 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 == "386" || GOARCH == "amd64" || GOARCH == "arm" || GOARCH == "arm64" || GOARCH == "loong64" || GOARCH == "mips64" || GOARCH == "mips64le" || GOARCH == "ppc64" || GOARCH == "ppc64le" || GOARCH == "riscv64" || GOARCH == "s390x" || GOARCH == "wasm") && GOOS != "windows"
+const crashStackImplemented = (GOARCH == "386" || GOARCH == "amd64" || GOARCH == "arm" || GOARCH == "arm64" || GOARCH == "loong64" || GOARCH == "mips" || GOARCH == "mipsle" || GOARCH == "mips64" || GOARCH == "mips64le" || GOARCH == "ppc64" || GOARCH == "ppc64le" || GOARCH == "riscv64" || GOARCH == "s390x" || GOARCH == "wasm") && GOOS != "windows"
 
 //go:noescape
 func switchToCrashStack0(fn func()) // in assembly