[PATCH 03/12] AARCH64 Linux: Fill 'collect_regset' in regset structures.

Andreas Arnez
2014-05-26T16:37:04Z

In order to provide 'collect_regset' support, the generic function
regcache_collect_regset is exploited. Since this requires writing
appropriate register maps, these can be used for supply_regset as
well.

gdb/
* aarch64-linux-nat.c (fill_gregset, fill_fpregset): Replace logic
by call to regcache_collect_regset.
(supply_gregset, supply_fpregset): Call regcache_supply_regset
instead of aarch64_linux_supply_gregset/_fpregset.
* aarch64-linux-tdep.c (AARCH64_LINUX_SIZEOF_GREGSET)
(AARCH64_LINUX_SIZEOF_FPREGSET): Delete macros here, move to
header file instead.
(aarch64_linux_supply_gregset, supply_gregset_from_core)
(aarch64_linux_suply_fpregset, supply_fpregset_from_core): Delete
functions. Move logic to ...
(aarch64_linux_gregmap, aarch64_linux_fpregmap): ... these new
register maps.
(aarch64_linux_gregset, aarch64_linux_fpregset): Make global,
refer to new register maps, replace *_regset_from_core by
regcache_supply_regset, and also use regcache_collect_regset.
* aarch64-linux-tdep.h: Include "regset.h".
(aarch64_linux_supply_gregset, aarch64_linux_supply_fpregset):
Delete prototypes.
(AARCH64_LINUX_SIZEOF_GREGSET, AARCH64_LINUX_SIZEOF_FPREGSET): New
macros, moved from C source file.
(aarch64_linux_gregset, aarch64_linux_fpregset): New global
variable declarations.
---
gdb/aarch64-linux-nat.c | 38 +++++++-------------
gdb/aarch64-linux-tdep.c | 90 +++++++++++++-----------------------------------
gdb/aarch64-linux-tdep.h | 18 +++++++---
3 files changed, 48 insertions(+), 98 deletions(-)

diff --git a/gdb/aarch64-linux-nat.c b/gdb/aarch64-linux-nat.c
index 877e702..4ae789b 100644
--- a/gdb/aarch64-linux-nat.c
+++ b/gdb/aarch64-linux-nat.c
@@ -616,14 +616,9 @@ void
fill_gregset (const struct regcache *regcache,
gdb_gregset_t *gregsetp, int regno)
{
- gdb_byte *gregs_buf = (gdb_byte *) gregsetp;
- int i;
-
- for (i = AARCH64_X0_REGNUM; i <= AARCH64_CPSR_REGNUM; i++)
- if (regno == -1 || regno == i)
- regcache_raw_collect (regcache, i,
- gregs_buf + X_REGISTER_SIZE
- * (i - AARCH64_X0_REGNUM));
+ regcache_collect_regset (&aarch64_linux_gregset, regcache,
+ regno, (gdb_byte *) gregsetp,
+ AARCH64_LINUX_SIZEOF_GREGSET);
}

/* Fill GDB's register array with the general-purpose register values
@@ -632,7 +627,9 @@ fill_gregset (const struct regcache *regcache,
void
supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
{
- aarch64_linux_supply_gregset (regcache, (const gdb_byte *) gregsetp);
+ regcache_supply_regset (&aarch64_linux_gregset, regcache, -1,
+ (const gdb_byte *) gregsetp,
+ AARCH64_LINUX_SIZEOF_GREGSET);
}

/* Fill register REGNO (if it is a floating-point register) in
@@ -643,22 +640,9 @@ void
fill_fpregset (const struct regcache *regcache,
gdb_fpregset_t *fpregsetp, int regno)
{
- gdb_byte *fpregs_buf = (gdb_byte *) fpregsetp;
- int i;
-
- for (i = AARCH64_V0_REGNUM; i <= AARCH64_V31_REGNUM; i++)
- if (regno == -1 || regno == i)
- regcache_raw_collect (regcache, i,
- fpregs_buf + V_REGISTER_SIZE
- * (i - AARCH64_V0_REGNUM));
-
- if (regno == -1 || regno == AARCH64_FPSR_REGNUM)
- regcache_raw_collect (regcache, AARCH64_FPSR_REGNUM,
- fpregs_buf + V_REGISTER_SIZE * 32);
-
- if (regno == -1 || regno == AARCH64_FPCR_REGNUM)
- regcache_raw_collect (regcache, AARCH64_FPCR_REGNUM,
- fpregs_buf + V_REGISTER_SIZE * 32 + 4);
+ regcache_collect_regset (&aarch64_linux_fpregset, regcache,
+ regno, (gdb_byte *) fpregsetp,
+ AARCH64_LINUX_SIZEOF_FPREGSET);
}

/* Fill GDB's register array with the floating-point register values
@@ -667,7 +651,9 @@ fill_fpregset (const struct regcache *regcache,
void
supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp)
{
- aarch64_linux_supply_fpregset (regcache, (const gdb_byte *) fpregsetp);
+ regcache_supply_regset (&aarch64_linux_fpregset, regcache, -1,
+ (const gdb_byte *) fpregsetp,
+ AARCH64_LINUX_SIZEOF_FPREGSET);
}

/* Called when resuming a thread.
diff --git a/gdb/aarch64-linux-tdep.c b/gdb/aarch64-linux-tdep.c
index 30ed73f..b3eaa95 100644
--- a/gdb/aarch64-linux-tdep.c
+++ b/gdb/aarch64-linux-tdep.c
@@ -41,16 +41,6 @@
#include "user-regs.h"
#include <ctype.h>

-/* The general-purpose regset consists of 31 X registers, plus SP, PC,
- and PSTATE registers, as defined in the AArch64 port of the Linux
- kernel. */
-#define AARCH64_LINUX_SIZEOF_GREGSET (34 * X_REGISTER_SIZE)
-
-/* The fp regset consists of 32 V registers, plus FPCR and FPSR which
- are 4 bytes wide each, and the whole structure is padded to 128 bit
- alignment. */
-#define AARCH64_LINUX_SIZEOF_FPREGSET (33 * V_REGISTER_SIZE)
-
/* Signal frame handling.

+------------+ ^
@@ -190,71 +180,37 @@ static const struct tramp_frame aarch64_linux_rt_sigframe =
aarch64_linux_sigframe_init
};

-/* Fill GDB's register array with the general-purpose register values
- in the buffer pointed by GREGS_BUF. */
-
-void
-aarch64_linux_supply_gregset (struct regcache *regcache,
- const gdb_byte *gregs_buf)
-{
- int regno;
-
- for (regno = AARCH64_X0_REGNUM; regno <= AARCH64_CPSR_REGNUM; regno++)
- regcache_raw_supply (regcache, regno,
- gregs_buf + X_REGISTER_SIZE
- * (regno - AARCH64_X0_REGNUM));
-}
-
-/* The "supply_regset" function for the general-purpose register set. */
-
-static void
-supply_gregset_from_core (const struct regset *regset,
- struct regcache *regcache,
- int regnum, const void *regbuf, size_t len)
-{
- aarch64_linux_supply_gregset (regcache, (const gdb_byte *) regbuf);
-}
-
-/* Fill GDB's register array with the floating-point register values
- in the buffer pointed by FPREGS_BUF. */
+/* Register maps. */

-void
-aarch64_linux_supply_fpregset (struct regcache *regcache,
- const gdb_byte *fpregs_buf)
-{
- int regno;
-
- for (regno = AARCH64_V0_REGNUM; regno <= AARCH64_V31_REGNUM; regno++)
- regcache_raw_supply (regcache, regno,
- fpregs_buf + V_REGISTER_SIZE
- * (regno - AARCH64_V0_REGNUM));
-
- regcache_raw_supply (regcache, AARCH64_FPSR_REGNUM,
- fpregs_buf + V_REGISTER_SIZE * 32);
- regcache_raw_supply (regcache, AARCH64_FPCR_REGNUM,
- fpregs_buf + V_REGISTER_SIZE * 32 + 4);
-}
-
-/* The "supply_regset" function for the floating-point register set. */
+static const struct regcache_map_entry aarch64_linux_gregmap[] =
+ {
+ { 31, AARCH64_X0_REGNUM }, /* x0 ... x30 */
+ { 1, AARCH64_SP_REGNUM },
+ { 1, AARCH64_PC_REGNUM },
+ { 1, AARCH64_CPSR_REGNUM },
+ { 0 }
+ };

-static void
-supply_fpregset_from_core (const struct regset *regset,
- struct regcache *regcache,
- int regnum, const void *regbuf, size_t len)
-{
- aarch64_linux_supply_fpregset (regcache, (const gdb_byte *) regbuf);
-}
+static const struct regcache_map_entry aarch64_linux_fpregmap[] =
+ {
+ { 32, AARCH64_V0_REGNUM }, /* v0 ... v31 */
+ { 1, AARCH64_FPSR_REGNUM },
+ { 1, AARCH64_FPCR_REGNUM },
+ { 0 }
+ };

-/* Register set definitions. */
+/* Register set definitions. */

-static const struct regset aarch64_linux_gregset =
+const struct regset aarch64_linux_gregset =
{
- NULL, supply_gregset_from_core, NULL
+ aarch64_linux_gregmap,
+ regcache_supply_regset, regcache_collect_regset
};

-static const struct regset aarch64_linux_fpregset =
+const struct regset aarch64_linux_fpregset =
{
- NULL, supply_fpregset_from_core, NULL
+ aarch64_linux_fpregmap,
+ regcache_supply_regset, regcache_collect_regset
};

/* Implement the "regset_from_core_section" gdbarch method. */
diff --git a/gdb/aarch64-linux-tdep.h b/gdb/aarch64-linux-tdep.h
index 48c7092..2e1de60 100644
--- a/gdb/aarch64-linux-tdep.h
+++ b/gdb/aarch64-linux-tdep.h
@@ -18,9 +18,17 @@
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */

-struct regcache;
+#include "regset.h"

-extern void aarch64_linux_supply_gregset (struct regcache *regcache,
- const gdb_byte *gregs_buf);
-extern void aarch64_linux_supply_fpregset (struct regcache *regcache,
- const gdb_byte *fpregs_buf);
+/* The general-purpose regset consists of 31 X registers, plus SP, PC,
+ and PSTATE registers, as defined in the AArch64 port of the Linux
+ kernel. */
+#define AARCH64_LINUX_SIZEOF_GREGSET (34 * X_REGISTER_SIZE)
+
+/* The fp regset consists of 32 V registers, plus FPCR and FPSR which
+ are 4 bytes wide each, and the whole structure is padded to 128 bit
+ alignment. */
+#define AARCH64_LINUX_SIZEOF_FPREGSET (33 * V_REGISTER_SIZE)
+
+extern const struct regset aarch64_linux_gregset;
+extern const struct regset aarch64_linux_fpregset;
--
1.8.4.2