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-rw-r--r--system/gcc/341-gccgo-libucontext-stack.patch42
1 files changed, 42 insertions, 0 deletions
diff --git a/system/gcc/341-gccgo-libucontext-stack.patch b/system/gcc/341-gccgo-libucontext-stack.patch
new file mode 100644
index 000000000..cc88bda5a
--- /dev/null
+++ b/system/gcc/341-gccgo-libucontext-stack.patch
@@ -0,0 +1,42 @@
+Similar to Solaris, libucontext does not clear the stack below makecontext.
+This causes the Go frontend to sometimes go below the stack.
+
+On 32-bit Arm systems, this resulted in #832. It is likely, though not known,
+that this could have caused other issues we've seen in gccgo as well.
+
+Additionally, since we strip libgo.so, filename is always NULL. This caused
+the unwinder to continue through runtime_mstart which caused the same issue.
+--- gcc-8.5.0/libgo/runtime/go-callers.c.old 2023-01-01 17:56:27.302982459 -0600
++++ gcc-8.5.0/libgo/runtime/go-callers.c 2023-01-01 17:58:00.612903483 -0600
+@@ -165,26 +165,11 @@
+ if (function != NULL)
+ {
+- if (__builtin_strcmp (function, "makecontext") == 0)
++ if (__builtin_strcmp (function, "makecontext") == 0
++ || __builtin_strcmp (function, "libucontext_makecontext") == 0
++ || __builtin_strcmp (function, "runtime_mstart") == 0
++ || __builtin_strcmp (function, "runtime.kickoff") == 0
++ || __builtin_strcmp (function, "runtime.main") == 0)
+ return 1;
+- if (filename != NULL)
+- {
+- const char *p;
+-
+- p = strrchr (filename, '/');
+- if (p == NULL)
+- p = filename;
+- if (__builtin_strcmp (p, "/proc.c") == 0)
+- {
+- if (__builtin_strcmp (function, "runtime_mstart") == 0)
+- return 1;
+- }
+- else if (__builtin_strcmp (p, "/proc.go") == 0)
+- {
+- if (__builtin_strcmp (function, "runtime.kickoff") == 0
+- || __builtin_strcmp (function, "runtime.main") == 0)
+- return 1;
+- }
+- }
+ }
+
+ return arg->index >= arg->max;