Non-SFI mode: Add Linux asynchronous signal support

src/nonsfi/linux/nonsfi_signal.h

Index: src/nonsfi/linux/nonsfi_signal.h
diff --git a/src/nonsfi/linux/nonsfi_signal.h b/src/nonsfi/linux/nonsfi_signal.h
new file mode 100644
index 0000000000000000000000000000000000000000..403691130b42833c86432029a8ecba53175ae42f
--- /dev/null
+++ b/src/nonsfi/linux/nonsfi_signal.h
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2015 The Native Client Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef NATIVE_CLIENT_SRC_NONSFI_LINUX_NONSFI_SIGNAL_H_
+#define NATIVE_CLIENT_SRC_NONSFI_LINUX_NONSFI_SIGNAL_H_ 1
+
+#include "native_client/src/include/nacl/nacl_exception.h"
+
+EXTERN_C_BEGIN
+
+#if defined(__i386__)
+
+/* From linux/arch/x86/include/uapi/asm/sigcontext32.h */
+struct sigcontext_ia32 {
+  uint16_t gs, __gsh;
+  uint16_t fs, __fsh;
+  uint16_t es, __esh;
+  uint16_t ds, __dsh;
+  uint32_t di;
+  uint32_t si;
+  uint32_t bp;
+  uint32_t sp;
+  uint32_t bx;
+  uint32_t dx;
+  uint32_t cx;
+  uint32_t ax;
+  uint32_t trapno;
+  uint32_t err;
+  uint32_t ip;
+  uint16_t cs, __csh;
+  uint32_t flags;
+  uint32_t sp_at_signal;
+  uint16_t ss, __ssh;
+  uint32_t fpstate;
+  uint32_t oldmask;
+  uint32_t cr2;
+};
+
+typedef struct sigcontext_ia32 linux_mcontext_t;
+
+#elif defined(__arm__)
+
+/* From linux/arch/arm/include/uapi/asm/sigcontext.h */
+struct sigcontext_arm {
+  uint32_t trap_no;
+  uint32_t error_code;
+  uint32_t oldmask;
+  uint32_t arm_r0;
+  uint32_t arm_r1;
+  uint32_t arm_r2;
+  uint32_t arm_r3;
+  uint32_t arm_r4;
+  uint32_t arm_r5;
+  uint32_t arm_r6;
+  uint32_t arm_r7;
+  uint32_t arm_r8;
+  uint32_t arm_r9;
+  uint32_t arm_r10;
+  uint32_t arm_r11;  /* fp */
+  uint32_t arm_r12;  /* ip */
+  uint32_t arm_sp;
+  uint32_t arm_lr;
+  uint32_t arm_pc;
+  uint32_t arm_cpsr;
+  uint32_t fault_address;
+};
+
+typedef struct sigcontext_arm linux_mcontext_t;
+
+#else
+#error "unsupported architecture"
+#endif
+
+struct NonSfiExceptionFrame {
+  struct NaClExceptionContext context;
+  struct NaClExceptionPortableContext portable;
+};
+
+extern pthread_mutex_t g_signal_handler_mutex;
+void nonsfi_initialize_signal_handler_locked(void);
+void nonsfi_install_exception_handler_locked(void);
+void exception_frame_from_signal_context(

[Mark Seaborn, 2015/08/12 01:43:07]

How about prefixing this with "nonsfi_" too?

[Luis Héctor Chávez, 2015/08/12 22:14:27]

Done.

+    struct NonSfiExceptionFrame *frame,
+    const void *raw_ctx);
+
+EXTERN_C_END
+
+#endif