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Re: PATCH: Support "ah", "bh", "ch", "dh" in amd64
- From: Mark Kettenis <mark dot kettenis at xs4all dot nl>
- To: hjl dot tools at gmail dot com
- Cc: gdb-patches at sourceware dot org
- Date: Thu, 1 Apr 2010 21:52:06 +0200 (CEST)
- Subject: Re: PATCH: Support "ah", "bh", "ch", "dh" in amd64
- References: <20100303205313.GA25695@intel.com> <20100401131339.GA3457@intel.com> <20100401194201.GA27051@intel.com>
> Date: Thu, 1 Apr 2010 12:42:01 -0700
> From: "H.J. Lu" <hongjiu.lu@intel.com>
>
> On Thu, Apr 01, 2010 at 06:13:39AM -0700, H.J. Lu wrote:
> > On Wed, Mar 03, 2010 at 12:53:13PM -0800, H.J. Lu wrote:
> > > Hi,
> > >
> > > AMD64 can access "ah", "bh", "ch", "dh". I missed them in my x86
> > > pseudo register support. This patch adds them. OK to install?
> > >
> > > Thanks.
> > >
> > >
> > > H.J.
> > > ---
> > > gdb/
> > >
> > > 2010-03-03 H.J. Lu <hongjiu.lu@intel.com>
> > >
> > > * amd64-tdep.c (amd64_byte_names): Add "ah", "bh", "ch", "dh".
> > > (amd64_pseudo_register_read): Handle "ah", "bh", "ch", "dh".
> > > (amd64_pseudo_register_write): Likewise.
> > > (amd64_init_abi): Set num_byte_regs to 20.
> > >
> > > gdb/testsuite/
> > >
> > > 2010-03-03 H.J. Lu <hongjiu.lu@intel.com>
> > >
> > > * gdb.arch/amd64-byte.exp: Check "ah", "bh", "ch", "dh".
> > >
>
> This is the updated patch to add AMD64_NUM_LOWER_BYTE_REGS instead
> of using 16. OK to install?
>
> Thanks.
Can you move the AMD64_NUM_LOWER_BYTE_REGS just below the
amd64_byte_names array? With that change this is ok.
> 2010-04-01 H.J. Lu <hongjiu.lu@intel.com>
>
> * amd64-tdep.c (amd64_byte_names): Add "ah", "bh", "ch", "dh".
> (AMD64_NUM_LOWER_BYTE_REGS): New.
> (amd64_pseudo_register_read): Handle "ah", "bh", "ch", "dh".
> (amd64_pseudo_register_write): Likewise.
> (amd64_init_abi): Set num_byte_regs to 20.
>
> gdb/testsuite/
>
> 2010-04-01 H.J. Lu <hongjiu.lu@intel.com>
>
> * gdb.arch/amd64-byte.exp: Check "ah", "bh", "ch", "dh".
>
> diff --git a/gdb/amd64-tdep.c b/gdb/amd64-tdep.c
> index e5cfa71..e53a67a 100644
> --- a/gdb/amd64-tdep.c
> +++ b/gdb/amd64-tdep.c
> @@ -215,7 +215,8 @@ amd64_arch_reg_to_regnum (int reg)
> static const char *amd64_byte_names[] =
> {
> "al", "bl", "cl", "dl", "sil", "dil", "bpl", "spl",
> - "r8l", "r9l", "r10l", "r11l", "r12l", "r13l", "r14l", "r15l"
> + "r8l", "r9l", "r10l", "r11l", "r12l", "r13l", "r14l", "r15l",
> + "ah", "bh", "ch", "dh"
> };
>
> /* Register names for word pseudo-registers. */
> @@ -250,6 +251,9 @@ amd64_pseudo_register_name (struct gdbarch *gdbarch, int regnum)
> return i386_pseudo_register_name (gdbarch, regnum);
> }
>
> +/* Number of lower byte registers. */
> +#define AMD64_NUM_LOWER_BYTE_REGS 16
> +
> static void
> amd64_pseudo_register_read (struct gdbarch *gdbarch,
> struct regcache *regcache,
> @@ -263,8 +267,18 @@ amd64_pseudo_register_read (struct gdbarch *gdbarch,
> int gpnum = regnum - tdep->al_regnum;
>
> /* Extract (always little endian). */
> - regcache_raw_read (regcache, gpnum, raw_buf);
> - memcpy (buf, raw_buf, 1);
> + if (gpnum >= AMD64_NUM_LOWER_BYTE_REGS)
> + {
> + /* Special handling for AH, BH, CH, DH. */
> + regcache_raw_read (regcache,
> + gpnum - AMD64_NUM_LOWER_BYTE_REGS, raw_buf);
> + memcpy (buf, raw_buf + 1, 1);
> + }
> + else
> + {
> + regcache_raw_read (regcache, gpnum, raw_buf);
> + memcpy (buf, raw_buf, 1);
> + }
> }
> else if (i386_dword_regnum_p (gdbarch, regnum))
> {
> @@ -289,12 +303,26 @@ amd64_pseudo_register_write (struct gdbarch *gdbarch,
> {
> int gpnum = regnum - tdep->al_regnum;
>
> - /* Read ... */
> - regcache_raw_read (regcache, gpnum, raw_buf);
> - /* ... Modify ... (always little endian). */
> - memcpy (raw_buf, buf, 1);
> - /* ... Write. */
> - regcache_raw_write (regcache, gpnum, raw_buf);
> + if (gpnum >= AMD64_NUM_LOWER_BYTE_REGS)
> + {
> + /* Read ... AH, BH, CH, DH. */
> + regcache_raw_read (regcache,
> + gpnum - AMD64_NUM_LOWER_BYTE_REGS, raw_buf);
> + /* ... Modify ... (always little endian). */
> + memcpy (raw_buf + 1, buf, 1);
> + /* ... Write. */
> + regcache_raw_write (regcache,
> + gpnum - AMD64_NUM_LOWER_BYTE_REGS, raw_buf);
> + }
> + else
> + {
> + /* Read ... */
> + regcache_raw_read (regcache, gpnum, raw_buf);
> + /* ... Modify ... (always little endian). */
> + memcpy (raw_buf, buf, 1);
> + /* ... Write. */
> + regcache_raw_write (regcache, gpnum, raw_buf);
> + }
> }
> else if (i386_dword_regnum_p (gdbarch, regnum))
> {
> @@ -2228,7 +2256,7 @@ amd64_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
> tdep->num_core_regs = AMD64_NUM_GREGS + I387_NUM_REGS;
> tdep->register_names = amd64_register_names;
>
> - tdep->num_byte_regs = 16;
> + tdep->num_byte_regs = 20;
> tdep->num_word_regs = 16;
> tdep->num_dword_regs = 16;
> /* Avoid wiring in the MMX registers for now. */
> diff --git a/gdb/testsuite/gdb.arch/amd64-byte.exp b/gdb/testsuite/gdb.arch/amd64-byte.exp
> index 9a14099..c76876b 100644
> --- a/gdb/testsuite/gdb.arch/amd64-byte.exp
> +++ b/gdb/testsuite/gdb.arch/amd64-byte.exp
> @@ -52,7 +52,6 @@ if ![runto_main] then {
> gdb_suppress_tests
> }
>
> -set nr_regs 14
> set byte_regs(1) al
> set byte_regs(2) bl
> set byte_regs(3) cl
> @@ -67,6 +66,10 @@ set byte_regs(11) r12l
> set byte_regs(12) r13l
> set byte_regs(13) r14l
> set byte_regs(14) r15l
> +set byte_regs(15) ah
> +set byte_regs(16) bh
> +set byte_regs(17) ch
> +set byte_regs(18) dh
>
> gdb_test "break [gdb_get_line_number "first breakpoint here"]" \
> "Breakpoint .* at .*${srcfile}.*" \
> @@ -79,12 +82,19 @@ for { set r 1 } { $r <= 6 } { incr r } {
> "check contents of %$byte_regs($r)"
> }
>
> +for { set r 1 } { $r <= 4 } { incr r } {
> + set h [expr $r + 14]
> + gdb_test "print/x \$$byte_regs($h)" \
> + ".. = 0x[format %x $r]2" \
> + "check contents of %$byte_regs($h)"
> +}
> +
> gdb_test "break [gdb_get_line_number "second breakpoint here"]" \
> "Breakpoint .* at .*${srcfile}.*" \
> "set second breakpoint in main"
> gdb_continue_to_breakpoint "continue to second breakpoint in main"
>
> -for { set r 7 } { $r <= $nr_regs } { incr r } {
> +for { set r 7 } { $r <= 14 } { incr r } {
> gdb_test "print/x \$$byte_regs($r)" \
> ".. = 0x[format %x $r]1" \
> "check contents of %$byte_regs($r)"
> @@ -94,6 +104,11 @@ for { set r 1 } { $r <= 6 } { incr r } {
> gdb_test "set var \$$byte_regs($r) = $r" "" "set %$byte_regs($r)"
> }
>
> +for { set r 1 } { $r <= 4 } { incr r } {
> + set h [expr $r + 14]
> + gdb_test "set var \$$byte_regs($h) = $h" "" "set %$byte_regs($h)"
> +}
> +
> gdb_test "break [gdb_get_line_number "third breakpoint here"]" \
> "Breakpoint .* at .*${srcfile}.*" \
> "set third breakpoint in main"
> @@ -105,7 +120,14 @@ for { set r 1 } { $r <= 6 } { incr r } {
> "check contents of %$byte_regs($r)"
> }
>
> -for { set r 7 } { $r <= $nr_regs } { incr r } {
> +for { set r 1 } { $r <= 4 } { incr r } {
> + set h [expr $r + 14]
> + gdb_test "print \$$byte_regs($h)" \
> + ".. = $h" \
> + "check contents of %$byte_regs($h)"
> +}
> +
> +for { set r 7 } { $r <= 14 } { incr r } {
> gdb_test "set var \$$byte_regs($r) = $r" "" "set %$byte_regs($r)"
> }
>
> @@ -114,7 +136,7 @@ gdb_test "break [gdb_get_line_number "forth breakpoint here"]" \
> "set forth breakpoint in main"
> gdb_continue_to_breakpoint "continue to forth breakpoint in main"
>
> -for { set r 7 } { $r <= $nr_regs } { incr r } {
> +for { set r 7 } { $r <= 14 } { incr r } {
> gdb_test "print \$$byte_regs($r)" \
> ".. = $r" \
> "check contents of %$byte_regs($r)"
>