* config/rs6000/linux-unwind.h (get_regs): Remove type

	puns. Change the type of `pc' to an array of unsigned ints and
	update all users.  Constify frame24.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@146615 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index af6b957..34f8081 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2009-04-23  Ben Elliston  <bje@au.ibm.com>
+
+       * config/rs6000/linux-unwind.h (get_regs): Remove type
+       puns. Change the type of `pc' to an array of unsigned ints and
+       update all users.  Constify frame24.
+
 2009-04-22  DJ Delorie  <dj@redhat.com>
 
        * config/m32c/m32c.c (m32c_special_page_vector_p): Move

diff --git a/gcc/config/rs6000/linux-unwind.h b/gcc/config/rs6000/linux-unwind.h
index ba573ae..a16df97 100644 (file)
--- a/gcc/config/rs6000/linux-unwind.h
+++ b/gcc/config/rs6000/linux-unwind.h
@@ -91,14 +91,13 @@ enum { SIGNAL_FRAMESIZE = 128 };
 static struct gcc_regs *
 get_regs (struct _Unwind_Context *context)
 {
-  const unsigned char *pc = context->ra;
+  const unsigned int *pc = context->ra;
 
   /* addi r1, r1, 128; li r0, 0x0077; sc  (sigreturn) */
   /* addi r1, r1, 128; li r0, 0x00AC; sc  (rt_sigreturn) */
-  if (*(unsigned int *) (pc + 0) != 0x38210000 + SIGNAL_FRAMESIZE
-      || *(unsigned int *) (pc + 8) != 0x44000002)
+  if (pc[0] != 0x38210000 + SIGNAL_FRAMESIZE || pc[2] != 0x44000002)
     return NULL;
-  if (*(unsigned int *) (pc + 4) == 0x38000077)
+  if (pc[1] == 0x38000077)
     {
       struct sigframe {
        char gap[SIGNAL_FRAMESIZE];
@@ -107,17 +106,17 @@ get_regs (struct _Unwind_Context *context)
       } *frame = (struct sigframe *) context->cfa;
       return frame->regs;
     }
-  else if (*(unsigned int *) (pc + 4) == 0x380000AC)
+  else if (pc[1] == 0x380000AC)
     {
       /* This works for 2.4 kernels, but not for 2.6 kernels with vdso
         because pc isn't pointing into the stack.  Can be removed when
         no one is running 2.4.19 or 2.4.20, the first two ppc64
         kernels released.  */
-      struct rt_sigframe_24 {
+      const struct rt_sigframe_24 {
        int tramp[6];
        void *pinfo;
        struct gcc_ucontext *puc;
-      } *frame24 = (struct rt_sigframe_24 *) pc;
+      } *frame24 = (const struct rt_sigframe_24 *) context->ra;
 
       /* Test for magic value in *puc of vdso.  */
       if ((long) frame24->puc != -21 * 8)
@@ -146,16 +145,15 @@ enum { SIGNAL_FRAMESIZE = 64 };
 static struct gcc_regs *
 get_regs (struct _Unwind_Context *context)
 {
-  const unsigned char *pc = context->ra;
+  const unsigned int *pc = context->ra;
 
   /* li r0, 0x7777; sc  (sigreturn old)  */
   /* li r0, 0x0077; sc  (sigreturn new)  */
   /* li r0, 0x6666; sc  (rt_sigreturn old)  */
   /* li r0, 0x00AC; sc  (rt_sigreturn new)  */
-  if (*(const unsigned int *) (pc + 4) != 0x44000002)
+  if (pc[1] != 0x44000002)
     return NULL;
-  if (*(const unsigned int *) (pc + 0) == 0x38007777
-      || *(const unsigned int *) (pc + 0) == 0x38000077)
+  if (pc[0] == 0x38007777 || pc[0] == 0x38000077)
     {
       struct sigframe {
        char gap[SIGNAL_FRAMESIZE];
@@ -164,8 +162,7 @@ get_regs (struct _Unwind_Context *context)
       } *frame = (struct sigframe *) context->cfa;
       return frame->regs;
     }
-  else if (*(const unsigned int *) (pc + 0) == 0x38006666
-          || *(const unsigned int *) (pc + 0) == 0x380000AC)
+  else if (pc[0] == 0x38006666 || pc[0] == 0x380000AC)
     {
       struct rt_sigframe {
        char gap[SIGNAL_FRAMESIZE + 16];