Add support for single register window model on SPARC

        2011-06-27  Eric Botcazou  <ebotcazou@adacore.com>
        * sparc-tdep.h (struct sparc_frame_cache): Add frame_offset,
        saved_regs_mask and copied_regs_mask fields.
        (sparc_record_save_insn): New prototype.
        * sparc-tdep.c (sparc_alloc_frame_cache): Initialize the new fields.
        (sparc_record_save_insn): New function.
        (sparc_analyze_prologue): Add head comment.  Recognize store insns
        of call-saved registers.  Use OFFSET consistently.  Recognize flat
        frames and cache their settings.
        (sparc32_skip_prologue): Handle flat frames.
        (sparc_frame_cache): Add frame_offset to the base address.
        (sparc32_frame_cache): Adjust to new frame description.
        (sparc32_frame_prev_register): Likewise.
        * sparc64-tdep.c (sparc64_frame_prev_register): Likewise.
        * sparc-sol2-tdep.c (sparc32_sol2_sigtramp_frame_cache): Likewise.
        * sparc64-sol2-tdep.c (sparc64_sol2_sigtramp_frame_cache): Likewise.
        * sparcnbsd-tdep.c (sparc32nbsd_sigcontext_frame_cache): Force the
        frame by calling sparc_record_save_insn.
        * sparc64nbsd-tdep.c (sparc64nbsd_sigcontext_frame_cache): Likewise.
        * sparcobsd-tdep.c (sparc32obsd_sigtramp_frame_cache): Likewise.
        * sparc64obsd-tdep.c (sparc64obsd_frame_cache): Likewise.

1 files changed, 13 insertions, 0 deletions

diff --git a/gdb/sparc-tdep.h b/gdb/sparc-tdep.h
index 0eb7afaeeb0..d4e8b067c61 100644
--- a/gdb/sparc-tdep.h
+++ b/gdb/sparc-tdep.h
@@ -146,6 +146,15 @@ struct sparc_frame_cache
   /* Do we have a frame?  */
   int frameless_p;
 
+  /* The offset from the base register to the CFA.  */
+  int frame_offset;
+
+  /* Mask of `local' and `in' registers saved in the register save area.  */
+  unsigned short int saved_regs_mask;
+
+  /* Mask of `out' registers copied or renamed to their `in' sibling.  */
+  unsigned char copied_regs_mask;
+
   /* Do we have a Structure, Union or Quad-Precision return value?  */
   int struct_return_p;
 
@@ -159,6 +168,10 @@ extern unsigned long sparc_fetch_instruction (CORE_ADDR pc);
 /* Fetch StackGhost Per-Process XOR cookie.  */
 extern ULONGEST sparc_fetch_wcookie (struct gdbarch *gdbarch);
 
+/* Record the effect of a SAVE instruction on CACHE.  */
+extern void sparc_record_save_insn (struct sparc_frame_cache *cache);
+
+/* Do a full analysis of the prologue at PC and update CACHE accordingly.  */
 extern CORE_ADDR sparc_analyze_prologue (struct gdbarch *gdbarch,
 					 CORE_ADDR pc, CORE_ADDR current_pc,
 					 struct sparc_frame_cache *cache);