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authorAndrew Cagney <cagney@redhat.com>2004-10-30 22:36:34 +0000
committerAndrew Cagney <cagney@redhat.com>2004-10-30 22:36:34 +0000
commit613e114ff9d8c0f2bbe5177ef94f702123bb8885 (patch)
tree0430c3bc647f9b87f9b1b8867b9f74b36dfd8db1 /gdb/mips-tdep.h
parentd37cca3d684da261b7982e9b854d532048a355e2 (diff)
downloadbinutils-gdb-613e114ff9d8c0f2bbe5177ef94f702123bb8885.tar.gz
2004-10-30 Andrew Cagney <cagney@gnu.org>
* mips-tdep.h: Add comments on registers. (MIPS_UNUSED_REGNUM): Define. * config/mips/tm-mips.h (ZERO_REGNUM, UNUSED_REGNUM) (T9_REGNUM, V0_REGNUM, A0_REGNUM): Delete. * irix5-nat.c, mipsv4-nat.c, mips-linux-tdep.c: Update. * mips-linux-nat.c, remote-mips.c: Update.
Diffstat (limited to 'gdb/mips-tdep.h')
-rw-r--r--gdb/mips-tdep.h18
1 files changed, 13 insertions, 5 deletions
diff --git a/gdb/mips-tdep.h b/gdb/mips-tdep.h
index 404ec7d76c7..9dac4c2946a 100644
--- a/gdb/mips-tdep.h
+++ b/gdb/mips-tdep.h
@@ -61,13 +61,20 @@ struct mips_regnum
};
extern const struct mips_regnum *mips_regnum (struct gdbarch *gdbarch);
+/* Register numbers of various important registers. Note that some of
+ these values are "real" register numbers, and correspond to the
+ general registers of the machine, and some are "phony" register
+ numbers which are too large to be actual register numbers as far as
+ the user is concerned but do serve to get the desired values when
+ passed to read_register. */
+
enum
{
- MIPS_ZERO_REGNUM = 0,
+ MIPS_ZERO_REGNUM = 0, /* Read-only register, always 0. */
MIPS_AT_REGNUM = 1,
- MIPS_V0_REGNUM = 2,
- MIPS_A0_REGNUM = 4,
- MIPS_T9_REGNUM = 25,
+ MIPS_V0_REGNUM = 2, /* Function integer return value. */
+ MIPS_A0_REGNUM = 4, /* Loc of first arg during a subr call */
+ MIPS_T9_REGNUM = 25, /* Contains address of callee in PIC. */
MIPS_SP_REGNUM = 29,
MIPS_RA_REGNUM = 31,
MIPS_EMBED_LO_REGNUM = 33,
@@ -75,7 +82,8 @@ enum
MIPS_EMBED_BADVADDR_REGNUM = 35,
MIPS_EMBED_CAUSE_REGNUM = 36,
MIPS_EMBED_PC_REGNUM = 37,
- MIPS_EMBED_FP0_REGNUM = 38
+ MIPS_EMBED_FP0_REGNUM = 38,
+ MIPS_UNUSED_REGNUM = 73 /* Never used, FIXME */
};
/* Defined in mips-tdep.c and used in remote-mips.c */