* config/mips/linux.mh (TDEP_XML): New.

	* features/mips-linux.xml, features/mips64-linux.xml: New files.
	* mips-linux-nat.c (mips_linux_register_addr): Handle
	MIPS_RESTART_REGNUM.
	(mips64_linux_register_addr): Likewise.
	(super_xfer_partial, mips_linux_xfer_partial): New.
	(_initialize_mips_linux_nat): Add them to the target_ops.
	* mips-linux-tdep.c (mips_supply_gregset): Handle MIPS_RESTART_REGNUM.
	(mips_fill_gregset, mips64_supply_gregset, mips64_fill_gregset)
	(mips_linux_o32_sigframe_init)
	(mips_linux_n32n64_sigframe_init): Likewise.
	(mips_linux_write_pc, mips_linux_restart_reg_p): New.
	(mips_linux_init_abi): Use mips_linux_write_pc.  Check for the
	"org.gnu.gdb.mips.linux" feature.
	* mips-linux-tdep.h (MIPS_RESTART_REGNUM): New constant.
	(mips_linux_restart_reg_p): New prototype.
	* mips-tdep.c (mips_gdbarch_init): Pass tdesc_data to the OS/ABI
	initialization routine.
	* Makefile.in (mips-linux-tdep.o, mips-linux-nat.o): Update.

	* gdb.texinfo (MIPS Features): Document org.gnu.gdb.mips.linux.

1 files changed, 10 insertions, 0 deletions

diff --git a/gdb/mips-linux-tdep.h b/gdb/mips-linux-tdep.h
index 213a745e2bc..764208ae0f5 100644
--- a/gdb/mips-linux-tdep.h
+++ b/gdb/mips-linux-tdep.h
@@ -92,3 +92,13 @@ void mips64_supply_gregset (struct regcache *, const mips64_elf_gregset_t *);
 void mips64_fill_gregset (const struct regcache *, mips64_elf_gregset_t *, int);
 void mips64_supply_fpregset (struct regcache *, const mips64_elf_fpregset_t *);
 void mips64_fill_fpregset (const struct regcache *, mips64_elf_fpregset_t *, int);
+
+enum {
+  /* The Linux kernel stores an error code from any interrupted
+     syscall in a "register" (in $0's save slot).  */
+  MIPS_RESTART_REGNUM = MIPS_LAST_EMBED_REGNUM + 1
+};
+
+/* Return 1 if MIPS_RESTART_REGNUM is usable.  */
+
+int mips_linux_restart_reg_p (struct gdbarch *gdbarch);