[SPARC] Small ASAN fixes

[Eric Botcazou]

This automatically passes -funwind-tables when ASAN is used on Linux, as done 
for other architectures, and also adjusts the shadow offset in 64-bit mode.

Tested on SPARC64/Linux, applied on the mainline.


2019-02-15  Eric Botcazou  <ebotca...@adacore.com>

        * config/sparc/linux.h (ASAN_CC1_SPEC): Define.
        (CC1_SPEC): Use GNU_USER_TARGET_CC1_SPEC and ASAN_CC1_SPEC.
        * config/sparc/linux64.h (ASAN_CC1_SPEC): Likewise.
        (CC1_SPEC): Likewise.
        * config/sparc/sparc.c (sparc_asan_shadow_offset): Adjust for 64-bit.

-- 
Eric Botcazou
Index: config/sparc/linux.h
===================================================================
--- config/sparc/linux.h	(revision 268849)
+++ config/sparc/linux.h	(working copy)
@@ -54,10 +54,11 @@ extern const char *host_detect_local_cpu
 
 #define DRIVER_SELF_SPECS MCPU_MTUNE_NATIVE_SPECS
 
-/* This is for -profile to use -lc_p instead of -lc.  */
-#undef	CC1_SPEC
-#define	CC1_SPEC "%{profile:-p} \
-"
+#undef  ASAN_CC1_SPEC
+#define ASAN_CC1_SPEC "%{%:sanitize(address):-funwind-tables}"
+
+#undef  CC1_SPEC
+#define CC1_SPEC GNU_USER_TARGET_CC1_SPEC ASAN_CC1_SPEC
 
 #undef SIZE_TYPE
 #define SIZE_TYPE "unsigned int"
Index: config/sparc/linux64.h
===================================================================
--- config/sparc/linux64.h	(revision 268849)
+++ config/sparc/linux64.h	(working copy)
@@ -143,24 +143,25 @@ extern const char *host_detect_local_cpu
 
 #define DRIVER_SELF_SPECS MCPU_MTUNE_NATIVE_SPECS
 
-#undef	CC1_SPEC
+#undef  ASAN_CC1_SPEC
+#define ASAN_CC1_SPEC "%{%:sanitize(address):-funwind-tables}"
+
+#undef  CC1_SPEC
 #if DEFAULT_ARCH32_P
-#define CC1_SPEC "%{profile:-p} \
-%{m32:%{m64:%emay not use both -m32 and -m64}} \
+#define CC1_SPEC GNU_USER_TARGET_CC1_SPEC ASAN_CC1_SPEC \
+"%{m32:%{m64:%emay not use both -m32 and -m64}} \
 %{m64:-mptr64 -mstack-bias -mlong-double-128 \
   %{!mcpu*:-mcpu=ultrasparc} \
-  %{!mno-vis:%{!mcpu=v9:-mvis}}} \
-"
+  %{!mno-vis:%{!mcpu=v9:-mvis}}}"
 #else
-#define CC1_SPEC "%{profile:-p} \
-%{m32:%{m64:%emay not use both -m32 and -m64}} \
+#define CC1_SPEC GNU_USER_TARGET_CC1_SPEC ASAN_CC1_SPEC \
+"%{m32:%{m64:%emay not use both -m32 and -m64}} \
 %{m32:-mptr32 -mno-stack-bias %{!mlong-double-128:-mlong-double-64} \
   %{!mcpu*:-mcpu=cypress}} \
 %{mv8plus:-mptr32 -mno-stack-bias %{!mlong-double-128:-mlong-double-64} \
   %{!mcpu*:-mcpu=v9}} \
 %{!m32:%{!mcpu*:-mcpu=ultrasparc}} \
-%{!mno-vis:%{!m32:%{!mcpu=v9:-mvis}}} \
-"
+%{!mno-vis:%{!m32:%{!mcpu=v9:-mvis}}}"
 #endif
 
 /* Support for a compile-time default CPU, et cetera.  The rules are:
Index: config/sparc/sparc.c
===================================================================
--- config/sparc/sparc.c	(revision 268849)
+++ config/sparc/sparc.c	(working copy)
@@ -12524,7 +12524,7 @@ sparc_init_machine_status (void)
 static unsigned HOST_WIDE_INT
 sparc_asan_shadow_offset (void)
 {
-  return TARGET_ARCH64 ? HOST_WIDE_INT_C (0x7fff8000) : (HOST_WIDE_INT_1 << 29);
+  return TARGET_ARCH64 ? (HOST_WIDE_INT_1 << 43) : (HOST_WIDE_INT_1 << 29);
 }
 
 /* This is called from dwarf2out.c via TARGET_ASM_OUTPUT_DWARF_DTPREL.