gdb

[deliverable/binutils-gdb.git] / gdb / mips-linux-tdep.c

diff --git a/gdb/mips-linux-tdep.c b/gdb/mips-linux-tdep.c
index e0592853d46ae98972218d545bf2db1c4ff0b2a5..c78d5d649f1d7be61258384accf961b81b7ef1f9 100644 (file)
--- a/gdb/mips-linux-tdep.c
+++ b/gdb/mips-linux-tdep.c
@@ -40,6 +40,7 @@
 #include "mips-linux-tdep.h"
 #include "glibc-tdep.h"
 #include "linux-tdep.h"
+#include "xml-syscall.h"
 
 static struct target_so_ops mips_svr4_so_ops;
 
@@ -413,7 +414,8 @@ mips64_fill_gregset (const struct regcache *regcache,
       mips64_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->lo);
       mips64_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->hi);
       mips64_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->pc);
-      mips64_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->badvaddr);
+      mips64_fill_gregset (regcache, gregsetp,
+                          mips_regnum (gdbarch)->badvaddr);
       mips64_fill_gregset (regcache, gregsetp, MIPS_PS_REGNUM);
       mips64_fill_gregset (regcache, gregsetp,  mips_regnum (gdbarch)->cause);
       mips64_fill_gregset (regcache, gregsetp, MIPS_RESTART_REGNUM);
@@ -538,7 +540,8 @@ mips64_fill_fpregset (const struct regcache *regcache,
        }
       else
        {
-         to = (gdb_byte *) (*fpregsetp + regno - gdbarch_fp0_regnum (gdbarch));
+         to = (gdb_byte *) (*fpregsetp + regno
+                            - gdbarch_fp0_regnum (gdbarch));
          regcache_raw_collect (regcache, regno, to);
        }
     }
@@ -1205,6 +1208,38 @@ mips_linux_syscall_next_pc (struct frame_info *frame)
   return pc + 4;
 }
 
+/* Return the current system call's number present in the
+   v0 register.  When the function fails, it returns -1.  */
+
+static LONGEST
+mips_linux_get_syscall_number (struct gdbarch *gdbarch,
+                              ptid_t ptid)
+{
+  struct regcache *regcache = get_thread_regcache (ptid);
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+  int regsize = register_size (gdbarch, MIPS_V0_REGNUM);
+  /* The content of a register */
+  gdb_byte buf[8];
+  /* The result */
+  LONGEST ret;
+
+  /* Make sure we're in a known ABI */
+  gdb_assert (tdep->mips_abi == MIPS_ABI_O32
+             || tdep->mips_abi == MIPS_ABI_N32
+             || tdep->mips_abi == MIPS_ABI_N64);
+
+  gdb_assert (regsize <= sizeof (buf));
+
+  /* Getting the system call number from the register.
+     syscall number is in v0 or $2.  */
+  regcache_cooked_read (regcache, MIPS_V0_REGNUM, buf);
+
+  ret = extract_signed_integer (buf, regsize, byte_order);
+
+  return ret;
+}
+
 /* Initialize one of the GNU/Linux OS ABIs.  */
 
 static void
@@ -1217,6 +1252,9 @@ mips_linux_init_abi (struct gdbarch_info info,
 
   linux_init_abi (info, gdbarch);
 
+  /* Get the syscall number from the arch's register.  */
+  set_gdbarch_get_syscall_number (gdbarch, mips_linux_get_syscall_number);
+
   switch (abi)
     {
       case MIPS_ABI_O32:
@@ -1226,6 +1264,7 @@ mips_linux_init_abi (struct gdbarch_info info,
          (gdbarch, svr4_ilp32_fetch_link_map_offsets);
        tramp_frame_prepend_unwinder (gdbarch, &mips_linux_o32_sigframe);
        tramp_frame_prepend_unwinder (gdbarch, &mips_linux_o32_rt_sigframe);
+       set_xml_syscall_file_name ("syscalls/mips-o32-linux.xml");
        break;
       case MIPS_ABI_N32:
        set_gdbarch_get_longjmp_target (gdbarch,
@@ -1239,6 +1278,7 @@ mips_linux_init_abi (struct gdbarch_info info,
           does not distinguish between quiet and signalling NaNs).  */
        set_gdbarch_long_double_format (gdbarch, floatformats_ia64_quad);
        tramp_frame_prepend_unwinder (gdbarch, &mips_linux_n32_rt_sigframe);
+       set_xml_syscall_file_name ("syscalls/mips-n32-linux.xml");
        break;
       case MIPS_ABI_N64:
        set_gdbarch_get_longjmp_target (gdbarch,
@@ -1252,6 +1292,7 @@ mips_linux_init_abi (struct gdbarch_info info,
           does not distinguish between quiet and signalling NaNs).  */
        set_gdbarch_long_double_format (gdbarch, floatformats_ia64_quad);
        tramp_frame_prepend_unwinder (gdbarch, &mips_linux_n64_rt_sigframe);
+       set_xml_syscall_file_name ("syscalls/mips-n64-linux.xml");
        break;
       default:
        break;