* sparc-linux-tdep.c (sparc32_linux_sigframe_init): New function.

	(sparc32_linux_sigframe, sparc32_linux_rt_sigframe): New tramp_frames.
	(sparc_linux_sigtramp_start, sparc32_linux_sigtramp_start,
	sparc32_linux_rt_sigtramp_start, sparc32_linux_sigtramp_p,
	sparc32_linux_sigtramp_frame_cache,
	sparc32_linux_sigtramp_frame_this_id,
	sparc32_linux_sigtramp_frame_prev_register,
	sparc32_linux_sigtramp_frame_unwind,
	sparc32_linux_sigtramp_frame_sniffer): Delete.
	(sparc32_linux_init_abi): Register new tramp unwinders.  Kill
	register of old sigtramp sniffer.
	* sparc64-linux-tdep.c (sparc64_linux_sigframe_init): New
	function.
	(sparc64_linux_rt_sigframe): New tramp frame.
	(sparc64_linux_sigtramp_start, sparc64_linux_sigtramp_p,
	sparc64_linux_sigtramp_frame_cache,
	sparc64_linux_sigtramp_frame_this_id,
	sparc64_linux_sigtramp_frame_prev_register,
	sparc64_linux_sigtramp_frame_unwind,
	sparc64_linux_sigtramp_frame_sniffer): Delete.
	(sparc64_linux_init_abi): Register new tramp unwinders.  Kill
	register of old sigtramp sniffer.
	Makefile.in (sparc64-linux-tdep.o): Update dependencies.
	(sparc-linux-tdep.o): Likewise.

1 files changed, 45 insertions, 147 deletions

diff --git a/gdb/sparc64-linux-tdep.c b/gdb/sparc64-linux-tdep.c
index 0047625..3401d2b 100644
--- a/gdb/sparc64-linux-tdep.c
+++ b/gdb/sparc64-linux-tdep.c
@@ -22,15 +22,13 @@
 #include "defs.h"
 #include "frame.h"
 #include "frame-unwind.h"
+#include "tramp-frame.h"
 #include "gdbarch.h"
 #include "osabi.h"
 #include "solib-svr4.h"
 #include "symtab.h"
 #include "trad-frame.h"
 
-#include "gdb_assert.h"
-#include "gdb_string.h"
-
 #include "sparc64-tdep.h"
 
 /* The instruction sequence for RT signals is
@@ -43,162 +41,62 @@
 #define LINUX64_RT_SIGTRAMP_INSN0	0x82102065
 #define LINUX64_RT_SIGTRAMP_INSN1	0x91d0206d
 
-/* If PC is in a sigtramp routine consisting of the instructions
-   LINUX64_RT_SIGTRAMP_INSN0 and LINUX64_RT_SIGTRAMP_INSN1, return
-   the address of the start of the routine.  Otherwise, return 0.  */
-
-static CORE_ADDR
-sparc64_linux_sigtramp_start (struct frame_info *next_frame)
-{
-  CORE_ADDR pc = frame_pc_unwind (next_frame);
-  ULONGEST word0, word1;
-  unsigned char buf[8];		/* Two instructions.  */
-
-  /* We only recognize a signal trampoline if PC is at the start of
-     one of the instructions.  We optimize for finding the PC at the
-     start of the instruction sequence, as will be the case when the
-     trampoline is not the first frame on the stack.  We assume that
-     in the case where the PC is not at the start of the instruction
-     sequence, there will be a few trailing readable bytes on the
-     stack.  */
-
-  if (!safe_frame_unwind_memory (next_frame, pc, buf, sizeof buf))
-    return 0;
-
-  word0 = extract_unsigned_integer (buf, 4);
-  if (word0 != LINUX64_RT_SIGTRAMP_INSN0)
-    {
-      if (word0 != LINUX64_RT_SIGTRAMP_INSN1)
-	return 0;
-
-      pc -= 4;
-      if (!safe_frame_unwind_memory (next_frame, pc, buf, sizeof buf))
-	return 0;
-
-      word0 = extract_unsigned_integer (buf, 4);
-    }
-
-  word1 = extract_unsigned_integer (buf + 4, 4);
-  if (word0 != LINUX64_RT_SIGTRAMP_INSN0
-      || word1 != LINUX64_RT_SIGTRAMP_INSN1)
-    return 0;
-
-  return pc;
-}
-
-static int
-sparc64_linux_sigtramp_p (struct frame_info *next_frame)
-{
-  CORE_ADDR pc = frame_pc_unwind (next_frame);
-  char *name;
 
-  find_pc_partial_function (pc, &name, NULL, NULL);
+static void sparc64_linux_sigframe_init (const struct tramp_frame *self,
+					 struct frame_info *next_frame,
+					 struct trad_frame_cache *this_cache,
+					 CORE_ADDR func);
 
-  /* If we have NAME, we can optimize the search.  The trampolines is
-     named __rt_sigreturn_stub.  However, is isn't dynamically exported
-     from the shared C library, so the trampoline may appear to be part
-     of the preceding function.  This should always be sigaction,
-     __sigaction, or __libc_sigaction (all aliases to the same function).  */
-  if (name == NULL || strstr (name, "sigaction") != NULL)
-    return (sparc64_linux_sigtramp_start (next_frame) != 0);
-
-  return (strcmp ("__rt_sigreturn_stub", name) == 0);
-}
+static const struct tramp_frame sparc64_linux_rt_sigframe = {
+  SIGTRAMP_FRAME,
+  4,
+  {
+    { LINUX64_RT_SIGTRAMP_INSN0, -1 },
+    { LINUX64_RT_SIGTRAMP_INSN1, -1 },
+    { TRAMP_SENTINEL_INSN, -1 }
+  },
+  sparc64_linux_sigframe_init
+};
 
-static struct sparc_frame_cache *
-sparc64_linux_sigtramp_frame_cache (struct frame_info *next_frame,
-				    void **this_cache)
+static void
+sparc64_linux_sigframe_init (const struct tramp_frame *self,
+			     struct frame_info *next_frame,
+			     struct trad_frame_cache *this_cache,
+			     CORE_ADDR func)
 {
-  struct sparc_frame_cache *cache;
-  CORE_ADDR sigcontext_addr, addr;
+  CORE_ADDR base, addr;
   int regnum;
 
-  if (*this_cache)
-    return *this_cache;
-
-  cache = sparc_frame_cache (next_frame, this_cache);
-  gdb_assert (cache == *this_cache);
-
-  regnum = SPARC_SP_REGNUM;
-  cache->base = frame_unwind_register_unsigned (next_frame, regnum);
-  if (cache->base & 1)
-    cache->base += BIAS;
-
-  regnum = SPARC_O1_REGNUM;
-  sigcontext_addr = frame_unwind_register_unsigned (next_frame, regnum);
-
-  /* If this is a RT signal trampoline, adjust SIGCONTEXT_ADDR
-     accordingly.  */
-  addr = sparc64_linux_sigtramp_start (next_frame);
-  if (addr)
-    sigcontext_addr += 128;
-  else
-    addr = frame_func_unwind (next_frame);
-
-  cache->pc = addr;
-
-  cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
+  base = frame_unwind_register_unsigned (next_frame, SPARC_O1_REGNUM);
+  base += 128;
 
   /* Offsets from <bits/sigcontext.h> */
 
   /* Since %g0 is always zero, keep the identity encoding.  */
-  for (addr = sigcontext_addr + 8, regnum = SPARC_G1_REGNUM;
-       regnum <= SPARC_O7_REGNUM; regnum++, addr += 8)
-    cache->saved_regs[regnum].addr = addr;
-
-  cache->saved_regs[SPARC64_STATE_REGNUM].addr = addr + 0;
-  cache->saved_regs[SPARC64_PC_REGNUM].addr = addr + 8;
-  cache->saved_regs[SPARC64_NPC_REGNUM].addr = addr + 16;
-  cache->saved_regs[SPARC64_Y_REGNUM].addr = addr + 24;
-  cache->saved_regs[SPARC64_FPRS_REGNUM].addr = addr + 28;
-
-  for (regnum = SPARC_L0_REGNUM, addr = cache->base;
-       regnum <= SPARC_I7_REGNUM; regnum++, addr += 8)
-    cache->saved_regs[regnum].addr = addr;
-
-  return cache;
-}
-
-static void
-sparc64_linux_sigtramp_frame_this_id (struct frame_info *next_frame,
-				      void **this_cache,
-				      struct frame_id *this_id)
-{
-  struct sparc_frame_cache *cache =
-    sparc64_linux_sigtramp_frame_cache (next_frame, this_cache);
-
-  (*this_id) = frame_id_build (cache->base, cache->pc);
-}
-
-static void
-sparc64_linux_sigtramp_frame_prev_register (struct frame_info *next_frame,
-					    void **this_cache,
-					    int regnum, int *optimizedp,
-					    enum lval_type *lvalp,
-					    CORE_ADDR *addrp,
-					    int *realnump, void *valuep)
-{
-  struct sparc_frame_cache *cache =
-    sparc64_linux_sigtramp_frame_cache (next_frame, this_cache);
+  addr = base + 0x08;
+  for (regnum = SPARC_G1_REGNUM; regnum <= SPARC_O7_REGNUM; regnum++)
+    {
+      trad_frame_set_reg_addr (this_cache, regnum, addr);
+      addr += 8;
+    }
 
-  trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum,
-				optimizedp, lvalp, addrp, realnump, valuep);
-}
+  trad_frame_set_reg_addr (this_cache, SPARC64_STATE_REGNUM, addr + 0x00);
+  trad_frame_set_reg_addr (this_cache, SPARC64_PC_REGNUM,    addr + 0x08);
+  trad_frame_set_reg_addr (this_cache, SPARC64_NPC_REGNUM,   addr + 0x10);
+  trad_frame_set_reg_addr (this_cache, SPARC64_Y_REGNUM,     addr + 0x18);
+  trad_frame_set_reg_addr (this_cache, SPARC64_FPRS_REGNUM,  addr + 0x1c);
 
-static const struct frame_unwind sparc64_linux_sigtramp_frame_unwind =
-{
-  SIGTRAMP_FRAME,
-  sparc64_linux_sigtramp_frame_this_id,
-  sparc64_linux_sigtramp_frame_prev_register
-};
-
-static const struct frame_unwind *
-sparc64_linux_sigtramp_frame_sniffer (struct frame_info *next_frame)
-{
-  if (sparc64_linux_sigtramp_p (next_frame))
-    return &sparc64_linux_sigtramp_frame_unwind;
+  addr = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM);
+  if (addr & 1)
+    addr += BIAS;
 
-  return NULL;
+  base = addr;
+  for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
+    {
+      trad_frame_set_reg_addr (this_cache, regnum, addr);
+      addr += 8;
+    }
+  trad_frame_set_id (this_cache, frame_id_build (base, func));
 }
 
 static void
@@ -206,7 +104,7 @@ sparc64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 
-  frame_unwind_append_sniffer (gdbarch, sparc64_linux_sigtramp_frame_sniffer);
+  tramp_frame_prepend_unwinder (gdbarch, &sparc64_linux_rt_sigframe);
 
   /* GNU/Linux is very similar to Solaris ...  */
   sparc64_sol2_init_abi (info, gdbarch);