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Ptrace support for AArch64 SVE gdbserver 

Add checks to detect SVE tdesc. Easiest way to do this is by checking the
size of the vector registers.

Use the common aarch64 ptrace copy functions for reading/writing registers.
A wrapper is required due to the common functions using reg_buffer_common.

gdbserver/
	* linux-aarch64-low.c (is_sve_tdesc): New function.
	(aarch64_sve_regs_copy_to_regcache): Likewise.
	(aarch64_sve_regs_copy_from_regcache):  Likewise.
	(aarch64_regs_info): Add SVE checks.
	(initialize_low_arch): Initialize SVE.
This commit is contained in:
Alan Hayward 2018-06-15 12:23:23 +01:00
parent e9902bfc28
commit 02895270ec
2 changed files with 68 additions and 3 deletions
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8
gdb/gdbserver/ChangeLog
View File

@ -1,3 +1,11 @@
2018-06-18 Alan Hayward <alan.hayward@arm.com>
* linux-aarch64-low.c (is_sve_tdesc): New function.
(aarch64_sve_regs_copy_to_regcache): Likewise.
(aarch64_sve_regs_copy_from_regcache): Likewise.
(aarch64_regs_info): Add SVE checks.
(initialize_low_arch): Initialize SVE.
2018-06-18 Alan Hayward <alan.hayward@arm.com>
* Makefile.in: Add aarch64-sve-linux-ptrace.c.

63
gdb/gdbserver/linux-aarch64-low.c
View File

@ -41,6 +41,7 @@
#include "arch/aarch64.h"
#include "linux-aarch64-tdesc.h"
#include "nat/aarch64-sve-linux-ptrace.h"
#include "tdesc.h"
#ifdef HAVE_SYS_REG_H
#include <sys/reg.h>
@ -73,6 +74,16 @@ is_64bit_tdesc (void)
return register_size (regcache->tdesc, 0) == 8;
}
/* Return true if the regcache contains the number of SVE registers. */
static bool
is_sve_tdesc (void)
{
struct regcache *regcache = get_thread_regcache (current_thread, 0);
return regcache->tdesc->reg_defs.size () == AARCH64_SVE_NUM_REGS;
}
/* Implementation of linux_target_ops method "cannot_store_register". */
static int
@ -514,6 +525,22 @@ aarch64_arch_setup (void)
aarch64_linux_get_debug_reg_capacity (lwpid_of (current_thread));
}
/* Wrapper for aarch64_sve_regs_copy_to_reg_buf. */
static void
aarch64_sve_regs_copy_to_regcache (struct regcache *regcache, const void *buf)
{
return aarch64_sve_regs_copy_to_reg_buf (regcache, buf);
}
/* Wrapper for aarch64_sve_regs_copy_from_reg_buf. */
static void
aarch64_sve_regs_copy_from_regcache (struct regcache *regcache, void *buf)
{
return aarch64_sve_regs_copy_from_reg_buf (regcache, buf);
}
static struct regset_info aarch64_regsets[] =
{
{ PTRACE_GETREGSET, PTRACE_SETREGSET, NT_PRSTATUS,
@ -540,15 +567,44 @@ static struct regs_info regs_info_aarch64 =
&aarch64_regsets_info,
};
static struct regset_info aarch64_sve_regsets[] =
{
{ PTRACE_GETREGSET, PTRACE_SETREGSET, NT_PRSTATUS,
sizeof (struct user_pt_regs), GENERAL_REGS,
aarch64_fill_gregset, aarch64_store_gregset },
{ PTRACE_GETREGSET, PTRACE_SETREGSET, NT_ARM_SVE,
SVE_PT_SIZE (AARCH64_MAX_SVE_VQ, SVE_PT_REGS_SVE), EXTENDED_REGS,
aarch64_sve_regs_copy_from_regcache, aarch64_sve_regs_copy_to_regcache
},
NULL_REGSET
};
static struct regsets_info aarch64_sve_regsets_info =
{
aarch64_sve_regsets, /* regsets. */
0, /* num_regsets. */
NULL, /* disabled_regsets. */
};
static struct regs_info regs_info_aarch64_sve =
{
NULL, /* regset_bitmap. */
NULL, /* usrregs. */
&aarch64_sve_regsets_info,
};
/* Implementation of linux_target_ops method "regs_info". */
static const struct regs_info *
aarch64_regs_info (void)
{
if (is_64bit_tdesc ())
return &regs_info_aarch64;
else
if (!is_64bit_tdesc ())
return &regs_info_aarch32;
if (is_sve_tdesc ())
return &regs_info_aarch64_sve;
return &regs_info_aarch64;
}
/* Implementation of linux_target_ops method "supports_tracepoints". */
@ -3027,6 +3083,7 @@ initialize_low_arch (void)
initialize_low_arch_aarch32 ();
initialize_regsets_info (&aarch64_regsets_info);
initialize_regsets_info (&aarch64_sve_regsets_info);
#if GDB_SELF_TEST
initialize_low_tdesc ();