[patch, nios2] Update Linux parts for new syscall ABI

[Chung-Lin Tang <cltang@codesourcery.com>]

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This patch updates the nios2-linux code for the new Linux generic system
call interface. Mainly removing (non-rt) sigreturn related definitions,
and updating the rt_sigreturn syscall NR.

Will commit after Sandra's approval.

Thanks,
Chung-Lin

2013-12-01  Chung-Lin Tang  <cltang@codesourcery.com>

        gdb/
        * nios2-linux-tdep.c (nios2_linux_sigreturn_init): Remove.
        (nios2_linux_sigreturn_tramp_frame): Remove.
        (nios2_linux_rt_sigreturn_tramp_frame): Update rt_sigreturn syscall
        number.
        (nios2_linux_syscall_next_pc): Likewise. Remove sigreturn case.
        (nios2_linux_init_abi):
        Remove registration of nios2_linux_sigreturn_tramp_frame.

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diff --git a/gdb/nios2-linux-tdep.c b/gdb/nios2-linux-tdep.c
index fe29e7a..2051d45 100644
--- a/gdb/nios2-linux-tdep.c
+++ b/gdb/nios2-linux-tdep.c
@@ -97,33 +97,6 @@ nios2_regset_from_core_section (struct gdbarch *gdbarch,
    FUNC is the address of the instruction TRAMP[0] in memory.  */
 
 static void
-nios2_linux_sigreturn_init (const struct tramp_frame *self,
-			    struct frame_info *next_frame,
-			    struct trad_frame_cache *this_cache,
-			    CORE_ADDR func)
-{
-  CORE_ADDR base = func + 16;
-  int i;
-
-  for (i = 0; i < 8; i++)
-    trad_frame_set_reg_addr (this_cache, i + 8, base + i * 4);
-  for (i = 0; i < 7; i++)
-    trad_frame_set_reg_addr (this_cache, i + 1, base + (i + 8) * 4);
-  trad_frame_set_reg_addr (this_cache, NIOS2_RA_REGNUM, base + 16 * 4);
-  trad_frame_set_reg_addr (this_cache, NIOS2_FP_REGNUM, base + 17 * 4);
-  trad_frame_set_reg_addr (this_cache, NIOS2_SP_REGNUM, base + 18 * 4);
-  trad_frame_set_reg_addr (this_cache, NIOS2_GP_REGNUM, base + 19 * 4);
-  trad_frame_set_reg_addr (this_cache, NIOS2_ESTATUS_REGNUM, base + 20 * 4);
-  trad_frame_set_reg_addr (this_cache, NIOS2_PC_REGNUM, base + 21 * 4);
-
-  /* Save a frame ID.  */
-  trad_frame_set_id (this_cache, frame_id_build (base, func));
-}
-
-/* Initialize a trad-frame cache corresponding to the tramp-frame.
-   FUNC is the address of the instruction TRAMP[0] in memory.  */
-
-static void
 nios2_linux_rt_sigreturn_init (const struct tramp_frame *self,
 			       struct frame_info *next_frame,
 			       struct trad_frame_cache *this_cache,
@@ -144,24 +117,12 @@ nios2_linux_rt_sigreturn_init (const struct tramp_frame *self,
   trad_frame_set_id (this_cache, frame_id_build (base, func));
 }
 
-static struct tramp_frame nios2_linux_sigreturn_tramp_frame =
-{
-  SIGTRAMP_FRAME,
-  4,
-  {
-    { 0x00800004 | (119 << 6), -1 },  /* movi r2,__NR_sigreturn */
-    { 0x003b683a, -1 },               /* trap */
-    { TRAMP_SENTINEL_INSN }
-  },
-  nios2_linux_sigreturn_init
-};
-
 static struct tramp_frame nios2_linux_rt_sigreturn_tramp_frame =
 {
   SIGTRAMP_FRAME,
   4,
   {
-    { 0x00800004 | (173 << 6), -1 },  /* movi r2,__NR_rt_sigreturn */
+    { 0x00800004 | (139 << 6), -1 },  /* movi r2,__NR_rt_sigreturn */
     { 0x003b683a, -1 },               /* trap */
     { TRAMP_SENTINEL_INSN }
   },
@@ -179,8 +140,7 @@ nios2_linux_syscall_next_pc (struct frame_info *frame)
 
   /* If we are about to make a sigreturn syscall, use the unwinder to
      decode the signal frame.  */
-  if (syscall_nr == 119 /* sigreturn */
-      || syscall_nr == 173 /* rt_sigreturn */)
+  if (syscall_nr == 139 /* rt_sigreturn */)
     return frame_unwind_caller_pc (frame);
 
   return pc + NIOS2_OPCODE_SIZE;
@@ -209,8 +169,6 @@ nios2_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
                                         nios2_regset_from_core_section);
   /* Linux signal frame unwinders.  */
   tramp_frame_prepend_unwinder (gdbarch,
-                                &nios2_linux_sigreturn_tramp_frame);
-  tramp_frame_prepend_unwinder (gdbarch,
                                 &nios2_linux_rt_sigreturn_tramp_frame);
 
   tdep->syscall_next_pc = nios2_linux_syscall_next_pc;