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

Yufeng Zhang
2014-05-27T21:36:17Z

It looks good to me, but I cannot approve it. Thanks for the refactoring.

Yufeng

On 05/26/14 17:36, Andreas Arnez wrote:
> 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
>
>