Use general instruction/stack pointer convenience method instead of manually

finding the instruction/stack pointer for exploitability rating.

There was already a method that found the instruction pointer, so the files
for exploitability ratings had repeated code. Also a method for finding the
stack pointer is implemented in this CL.

R=ivanpe@chromium.org

Review URL: https://codereview.chromium.org/1210943005

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1468 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/google_breakpad/common/minidump_cpu_ppc.h

@@ -140,6 +140,11 @@ typedef struct {
   MDVectorSaveAreaPPC   vector_save;
 } MDRawContextPPC;  /* Based on ppc_thread_state */
 
+/* Indices into gpr for registers with a dedicated or conventional purpose. */
+enum MDPPCRegisterNumbers {
+  MD_CONTEXT_PPC_REG_SP = 1
+};
+
 #if defined(__SUNPRO_C) || defined(__SUNPRO_CC)
 #pragma pack(0)
 #else

src/google_breakpad/common/minidump_cpu_ppc64.h

@@ -112,6 +112,11 @@ typedef struct {
   MDVectorSaveAreaPPC   vector_save;
 } MDRawContextPPC64;  /* Based on ppc_thread_state */
 
+/* Indices into gpr for registers with a dedicated or conventional purpose. */
+enum MDPPC64RegisterNumbers {
+  MD_CONTEXT_PPC64_REG_SP = 1
+};
+
 /* For (MDRawContextPPC).context_flags.  These values indicate the type of
  * context stored in the structure.  MD_CONTEXT_PPC is Breakpad-defined.  Its
  * value was chosen to avoid likely conflicts with MD_CONTEXT_* for other

src/google_breakpad/common/minidump_cpu_sparc.h

@@ -138,6 +138,11 @@ typedef struct {
 
 } MDRawContextSPARC;  /* CONTEXT_SPARC */
 
+/* Indices into g_r for registers with a dedicated or conventional purpose. */
+enum MDSPARCRegisterNumbers {
+  MD_CONTEXT_SPARC_REG_SP = 14
+};
+
 /* For (MDRawContextSPARC).context_flags.  These values indicate the type of
  * context stored in the structure.  MD_CONTEXT_SPARC is Breakpad-defined.  Its
  * value was chosen to avoid likely conflicts with MD_CONTEXT_* for other