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Function for reading the Aarch64 SVE vector length

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Returns 0 for systems without SVE support.

Note the defines taken from Linux kernel headers
in aarch64-sve-linux-ptrace.h.

gdb/
	* Makefile.in: Add new header.
	* gdb/arch/aarch64.h (sve_vg_from_vl): New macro.
	(sve_vl_from_vg): Likewise.
	(sve_vq_from_vl): Likewise.
	(sve_vl_from_vq): Likewise.
	(sve_vq_from_vg): Likewise.
	(sve_vg_from_vq): Likewise.
	* configure.nat: Add new c file.
	* nat/aarch64-sve-linux-ptrace.c: New file.
	* nat/aarch64-sve-linux-ptrace.h: New file.

gdbserver/
	* configure.srv: Add new c/h file.
This commit is contained in:
Alan Hayward 2018-05-31 14:36:48 +01:00
parent 95228a0d79
commit 122394f147
8 changed files with 169 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
gdb/ChangeLog
View File

@ -1,3 +1,16 @@
2018-05-31 Alan Hayward <alan.hayward@arm.com>
* Makefile.in: Add new header.
* gdb/arch/aarch64.h (sve_vg_from_vl): New macro.
(sve_vl_from_vg): Likewise.
(sve_vq_from_vl): Likewise.
(sve_vl_from_vq): Likewise.
(sve_vq_from_vg): Likewise.
(sve_vg_from_vq): Likewise.
* configure.nat: Add new c file.
* nat/aarch64-sve-linux-ptrace.c: New file.
* nat/aarch64-sve-linux-ptrace.h: New file.
2018-05-31 Alan Hayward <alan.hayward@arm.com>
* aarch64-linux-nat.c (aarch64_linux_read_description):

1
gdb/Makefile.in
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@ -1483,6 +1483,7 @@ HFILES_NO_SRCDIR = \
mi/mi-parse.h \
nat/aarch64-linux.h \
nat/aarch64-linux-hw-point.h \
nat/aarch64-sve-linux-ptrace.h \
nat/amd64-linux-siginfo.h \
nat/gdb_ptrace.h \
nat/gdb_thread_db.h \

17
gdb/arch/aarch64.h
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@ -52,6 +52,23 @@ enum aarch64_regnum
#define AARCH64_V_REGS_NUM 32
#define AARCH64_NUM_REGS AARCH64_FPCR_REGNUM + 1
/* There are a number of ways of expressing the current SVE vector size:
VL : Vector Length.
The number of bytes in an SVE Z register.
VQ : Vector Quotient.
The number of 128bit chunks in an SVE Z register.
VG : Vector Gradient.
The number of 64bit chunks in an SVE Z register. */
#define sve_vg_from_vl(vl) ((vl) / 8)
#define sve_vl_from_vg(vg) ((vg) * 8)
#define sve_vq_from_vl(vl) ((vl) / 0x10)
#define sve_vl_from_vq(vq) ((vq) * 0x10)
#define sve_vq_from_vg(vg) (sve_vq_from_vl (sve_vl_from_vg (vg)))
#define sve_vg_from_vq(vq) (sve_vg_from_vl (sve_vl_from_vq (vq)))
/* Maximum supported VQ value. Increase if required. */
#define AARCH64_MAX_SVE_VQ 16

3
gdb/configure.nat
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@ -228,7 +228,8 @@ case ${gdb_host} in
aarch64)
# Host: AArch64 based machine running GNU/Linux
NATDEPFILES="${NATDEPFILES} aarch64-linux-nat.o \
aarch32-linux-nat.o aarch64-linux-hw-point.o aarch64-linux.o"
aarch32-linux-nat.o aarch64-linux-hw-point.o aarch64-linux.o \
aarch64-sve-linux-ptrace.o"
;;
arm)
# Host: ARM based machine running GNU/Linux

4
gdb/gdbserver/ChangeLog
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@ -1,3 +1,7 @@
2018-05-31 Alan Hayward <alan.hayward@arm.com>
* configure.srv: Add new c/h file.
2018-05-31 Alan Hayward <alan.hayward@arm.com>
* linux-aarch64-tdesc.c (aarch64_linux_read_description): Add

1
gdb/gdbserver/configure.srv
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@ -54,6 +54,7 @@ case "${target}" in
srv_tgtobj="$srv_tgtobj arch/aarch64-insn.o"
srv_tgtobj="$srv_tgtobj arch/aarch64.o"
srv_tgtobj="$srv_tgtobj linux-aarch64-tdesc.o"
srv_tgtobj="$srv_tgtobj aarch64-sve-linux-ptrace.o"
srv_tgtobj="${srv_tgtobj} $srv_linux_obj"
srv_linux_regsets=yes
srv_linux_thread_db=yes

58
gdb/nat/aarch64-sve-linux-ptrace.c Normal file
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@ -0,0 +1,58 @@
/* Common target dependent for AArch64 systems.
Copyright (C) 2018 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <sys/utsname.h>
#include <sys/uio.h>
#include "common-defs.h"
#include "elf/external.h"
#include "elf/common.h"
#include "aarch64-sve-linux-ptrace.h"
#include "arch/aarch64.h"
/* See nat/aarch64-sve-linux-ptrace.h. */
unsigned long
aarch64_sve_get_vq (int tid)
{
struct iovec iovec;
struct user_sve_header header;
iovec.iov_len = sizeof (header);
iovec.iov_base = &header;
/* Ptrace gives the vector length in bytes. Convert it to VQ, the number of
128bit chunks in a Z register. We use VQ because 128bits is the minimum
a Z register can increase in size. */
if (ptrace (PTRACE_GETREGSET, tid, NT_ARM_SVE, &iovec) < 0)
{
/* SVE is not supported. */
return 0;
}
long vq = sve_vq_from_vl (header.vl);
if (!sve_vl_valid (header.vl))
{
warning (_("Invalid SVE state from kernel; SVE disabled."));
return 0;
}
return vq;
}

73
gdb/nat/aarch64-sve-linux-ptrace.h Normal file
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@ -0,0 +1,73 @@
/* Common target dependent for AArch64 systems.
Copyright (C) 2018 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef AARCH64_SVE_LINUX_PTRACE_H
#define AARCH64_SVE_LINUX_PTRACE_H
/* Where indicated, this file contains defines and macros lifted directly from
the Linux kernel headers, with no modification.
Refer to Linux kernel documentation for details. */
#include <asm/sigcontext.h>
#include <sys/utsname.h>
#include <sys/ptrace.h>
#include <asm/ptrace.h>
/* Read VQ for the given tid using ptrace. If SVE is not supported then zero
is returned (on a system that supports SVE, then VQ cannot be zero). */
extern unsigned long aarch64_sve_get_vq (int tid);
/* Structures and defines taken from sigcontext.h. */
#ifndef SVE_SIG_ZREGS_SIZE
#define SVE_VQ_BYTES 16 /* number of bytes per quadword */
#define SVE_VQ_MIN 1
#define SVE_VQ_MAX 512
#define SVE_VL_MIN (SVE_VQ_MIN * SVE_VQ_BYTES)
#define SVE_VL_MAX (SVE_VQ_MAX * SVE_VQ_BYTES)
#define SVE_NUM_ZREGS 32
#define SVE_NUM_PREGS 16
#define sve_vl_valid(vl) \
((vl) % SVE_VQ_BYTES == 0 && (vl) >= SVE_VL_MIN && (vl) <= SVE_VL_MAX)
#endif /* SVE_SIG_ZREGS_SIZE. */
/* Structures and defines taken from ptrace.h. */
#ifndef SVE_PT_SVE_ZREG_SIZE
struct user_sve_header {
__u32 size; /* total meaningful regset content in bytes */
__u32 max_size; /* maxmium possible size for this thread */
__u16 vl; /* current vector length */
__u16 max_vl; /* maximum possible vector length */
__u16 flags;
__u16 __reserved;
};
#endif /* SVE_PT_SVE_ZREG_SIZE. */
#endif /* aarch64-sve-linux-ptrace.h */