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linux-s390-ipa.cc
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/* GNU/Linux S/390 specific low level interface, for the in-process
agent library for GDB.
Copyright (C) 2016-2024 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/mman.h>
#include "tracepoint.h"
#include "linux-s390-tdesc.h"
#include <elf.h>
#ifdef HAVE_GETAUXVAL
#include <sys/auxv.h>
#endif
#define FT_FPR(x) (0x000 + (x) * 0x10)
#define FT_VR(x) (0x000 + (x) * 0x10)
#define FT_VR_L(x) (0x008 + (x) * 0x10)
#define FT_GPR(x) (0x200 + (x) * 8)
#define FT_GPR_U(x) (0x200 + (x) * 8)
#define FT_GPR_L(x) (0x204 + (x) * 8)
#define FT_GPR(x) (0x200 + (x) * 8)
#define FT_ACR(x) (0x280 + (x) * 4)
#define FT_PSWM 0x2c0
#define FT_PSWM_U 0x2c0
#define FT_PSWA 0x2c8
#define FT_PSWA_L 0x2cc
#define FT_FPC 0x2d0
/* Mappings between registers collected by the jump pad and GDB's register
array layout used by regcache.
See linux-s390-low.c (s390_install_fast_tracepoint_jump_pad) for more
details. */
#ifndef __s390x__
/* Used for s390-linux32, s390-linux32v1, s390-linux32v2. */
static const int s390_linux32_ft_collect_regmap[] = {
/* 32-bit PSWA and PSWM. */
FT_PSWM_U, FT_PSWA_L,
/* 32-bit GPRs (mapped to lower halves of 64-bit slots). */
FT_GPR_L (0), FT_GPR_L (1), FT_GPR_L (2), FT_GPR_L (3),
FT_GPR_L (4), FT_GPR_L (5), FT_GPR_L (6), FT_GPR_L (7),
FT_GPR_L (8), FT_GPR_L (9), FT_GPR_L (10), FT_GPR_L (11),
FT_GPR_L (12), FT_GPR_L (13), FT_GPR_L (14), FT_GPR_L (15),
/* ACRs */
FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3),
FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7),
FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11),
FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15),
/* FPRs (mapped to upper halves of 128-bit VR slots). */
FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3),
FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7),
FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11),
FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15),
/* orig_r2, last_break, system_call */
-1, -1, -1,
};
/* Used for s390-linux64, s390-linux64v1, s390-linux64v2, s390-vx-linux64. */
static const int s390_linux64_ft_collect_regmap[] = {
/* 32-bit PSWA and PSWM. */
FT_PSWM_U, FT_PSWA_L,
/* 32-bit halves of 64-bit GPRs. */
FT_GPR_U (0), FT_GPR_L (0),
FT_GPR_U (1), FT_GPR_L (1),
FT_GPR_U (2), FT_GPR_L (2),
FT_GPR_U (3), FT_GPR_L (3),
FT_GPR_U (4), FT_GPR_L (4),
FT_GPR_U (5), FT_GPR_L (5),
FT_GPR_U (6), FT_GPR_L (6),
FT_GPR_U (7), FT_GPR_L (7),
FT_GPR_U (8), FT_GPR_L (8),
FT_GPR_U (9), FT_GPR_L (9),
FT_GPR_U (10), FT_GPR_L (10),
FT_GPR_U (11), FT_GPR_L (11),
FT_GPR_U (12), FT_GPR_L (12),
FT_GPR_U (13), FT_GPR_L (13),
FT_GPR_U (14), FT_GPR_L (14),
FT_GPR_U (15), FT_GPR_L (15),
/* ACRs */
FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3),
FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7),
FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11),
FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15),
/* FPRs (mapped to upper halves of 128-bit VR slots). */
FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3),
FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7),
FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11),
FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15),
/* orig_r2, last_break, system_call */
-1, -1, -1,
/* Lower halves of 128-bit VRs. */
FT_VR_L (0), FT_VR_L (1), FT_VR_L (2), FT_VR_L (3),
FT_VR_L (4), FT_VR_L (5), FT_VR_L (6), FT_VR_L (7),
FT_VR_L (8), FT_VR_L (9), FT_VR_L (10), FT_VR_L (11),
FT_VR_L (12), FT_VR_L (13), FT_VR_L (14), FT_VR_L (15),
/* And the next 16 VRs. */
FT_VR (16), FT_VR (17), FT_VR (18), FT_VR (19),
FT_VR (20), FT_VR (21), FT_VR (22), FT_VR (23),
FT_VR (24), FT_VR (25), FT_VR (26), FT_VR (27),
FT_VR (28), FT_VR (29), FT_VR (30), FT_VR (31),
};
/* Used for s390-te-linux64, s390-tevx-linux64, and s390-gs-linux64. */
static const int s390_te_linux64_ft_collect_regmap[] = {
/* 32-bit PSWA and PSWM. */
FT_PSWM_U, FT_PSWA_L,
/* 32-bit halves of 64-bit GPRs. */
FT_GPR_U (0), FT_GPR_L (0),
FT_GPR_U (1), FT_GPR_L (1),
FT_GPR_U (2), FT_GPR_L (2),
FT_GPR_U (3), FT_GPR_L (3),
FT_GPR_U (4), FT_GPR_L (4),
FT_GPR_U (5), FT_GPR_L (5),
FT_GPR_U (6), FT_GPR_L (6),
FT_GPR_U (7), FT_GPR_L (7),
FT_GPR_U (8), FT_GPR_L (8),
FT_GPR_U (9), FT_GPR_L (9),
FT_GPR_U (10), FT_GPR_L (10),
FT_GPR_U (11), FT_GPR_L (11),
FT_GPR_U (12), FT_GPR_L (12),
FT_GPR_U (13), FT_GPR_L (13),
FT_GPR_U (14), FT_GPR_L (14),
FT_GPR_U (15), FT_GPR_L (15),
/* ACRs */
FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3),
FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7),
FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11),
FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15),
/* FPRs (mapped to upper halves of 128-bit VR slots). */
FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3),
FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7),
FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11),
FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15),
/* orig_r2, last_break, system_call */
-1, -1, -1,
/* TDB */
-1, -1, -1, -1,
-1, -1, -1, -1,
-1, -1, -1, -1,
-1, -1, -1, -1,
-1, -1, -1, -1,
/* Lower halves of 128-bit VRs. */
FT_VR_L (0), FT_VR_L (1), FT_VR_L (2), FT_VR_L (3),
FT_VR_L (4), FT_VR_L (5), FT_VR_L (6), FT_VR_L (7),
FT_VR_L (8), FT_VR_L (9), FT_VR_L (10), FT_VR_L (11),
FT_VR_L (12), FT_VR_L (13), FT_VR_L (14), FT_VR_L (15),
/* And the next 16 VRs. */
FT_VR (16), FT_VR (17), FT_VR (18), FT_VR (19),
FT_VR (20), FT_VR (21), FT_VR (22), FT_VR (23),
FT_VR (24), FT_VR (25), FT_VR (26), FT_VR (27),
FT_VR (28), FT_VR (29), FT_VR (30), FT_VR (31),
};
#else /* __s390x__ */
/* Used for s390x-linux64, s390x-linux64v1, s390x-linux64v2, s390x-vx-linux64. */
static const int s390x_ft_collect_regmap[] = {
/* 64-bit PSWA and PSWM. */
FT_PSWM, FT_PSWA,
/* 64-bit GPRs. */
FT_GPR (0), FT_GPR (1), FT_GPR (2), FT_GPR (3),
FT_GPR (4), FT_GPR (5), FT_GPR (6), FT_GPR (7),
FT_GPR (8), FT_GPR (9), FT_GPR (10), FT_GPR (11),
FT_GPR (12), FT_GPR (13), FT_GPR (14), FT_GPR (15),
/* ACRs */
FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3),
FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7),
FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11),
FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15),
/* FPRs (mapped to upper halves of 128-bit VR slots). */
FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3),
FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7),
FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11),
FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15),
/* orig_r2, last_break, system_call */
-1, -1, -1,
/* Lower halves of 128-bit VRs. */
FT_VR_L (0), FT_VR_L (1), FT_VR_L (2), FT_VR_L (3),
FT_VR_L (4), FT_VR_L (5), FT_VR_L (6), FT_VR_L (7),
FT_VR_L (8), FT_VR_L (9), FT_VR_L (10), FT_VR_L (11),
FT_VR_L (12), FT_VR_L (13), FT_VR_L (14), FT_VR_L (15),
/* And the next 16 VRs. */
FT_VR (16), FT_VR (17), FT_VR (18), FT_VR (19),
FT_VR (20), FT_VR (21), FT_VR (22), FT_VR (23),
FT_VR (24), FT_VR (25), FT_VR (26), FT_VR (27),
FT_VR (28), FT_VR (29), FT_VR (30), FT_VR (31),
};
/* Used for s390x-te-linux64, s390x-tevx-linux64, and
s390x-gs-linux64. */
static const int s390x_te_ft_collect_regmap[] = {
/* 64-bit PSWA and PSWM. */
FT_PSWM, FT_PSWA,
/* 64-bit GPRs. */
FT_GPR (0), FT_GPR (1), FT_GPR (2), FT_GPR (3),
FT_GPR (4), FT_GPR (5), FT_GPR (6), FT_GPR (7),
FT_GPR (8), FT_GPR (9), FT_GPR (10), FT_GPR (11),
FT_GPR (12), FT_GPR (13), FT_GPR (14), FT_GPR (15),
/* ACRs */
FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3),
FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7),
FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11),
FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15),
/* FPRs (mapped to upper halves of 128-bit VR slots). */
FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3),
FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7),
FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11),
FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15),
/* orig_r2, last_break, system_call */
-1, -1, -1,
/* TDB */
-1, -1, -1, -1,
-1, -1, -1, -1,
-1, -1, -1, -1,
-1, -1, -1, -1,
-1, -1, -1, -1,
/* Lower halves of 128-bit VRs. */
FT_VR_L (0), FT_VR_L (1), FT_VR_L (2), FT_VR_L (3),
FT_VR_L (4), FT_VR_L (5), FT_VR_L (6), FT_VR_L (7),
FT_VR_L (8), FT_VR_L (9), FT_VR_L (10), FT_VR_L (11),
FT_VR_L (12), FT_VR_L (13), FT_VR_L (14), FT_VR_L (15),
/* And the next 16 VRs. */
FT_VR (16), FT_VR (17), FT_VR (18), FT_VR (19),
FT_VR (20), FT_VR (21), FT_VR (22), FT_VR (23),
FT_VR (24), FT_VR (25), FT_VR (26), FT_VR (27),
FT_VR (28), FT_VR (29), FT_VR (30), FT_VR (31),
};
#endif
/* Initialized by get_ipa_tdesc according to the tdesc in use. */
static const int *s390_regmap;
static int s390_regnum;
/* Fill in REGCACHE with registers saved by the jump pad in BUF. */
void
supply_fast_tracepoint_registers (struct regcache *regcache,
const unsigned char *buf)
{
int i;
for (i = 0; i < s390_regnum; i++)
if (s390_regmap[i] != -1)
supply_register (regcache, i, ((char *) buf) + s390_regmap[i]);
}
ULONGEST
get_raw_reg (const unsigned char *raw_regs, int regnum)
{
int offset;
if (regnum >= s390_regnum)
return 0;
offset = s390_regmap[regnum];
if (offset == -1)
return 0;
/* The regnums are variable, better to figure out size by FT offset. */
/* 64-bit ones. */
if (offset < FT_VR(16)
#ifdef __s390x__
|| (offset >= FT_GPR(0) && offset < FT_ACR(0))
|| offset == FT_PSWM
|| offset == FT_PSWA
#endif
)
return *(uint64_t *) (raw_regs + offset);
if (offset >= FT_ACR(0 && offset < FT_PSWM)
|| offset == FT_FPC
#ifndef __s390x__
|| (offset >= FT_GPR(0) && offset < FT_ACR(0))
|| offset == FT_PSWM_U
|| offset == FT_PSWA_L
#endif
)
return *(uint32_t *) (raw_regs + offset);
/* This leaves 128-bit VX. No way to return them. */
return 0;
}
/* Return target_desc to use for IPA, given the tdesc index passed by
gdbserver. For s390, it also sets s390_regmap and s390_regnum. */
const struct target_desc *
get_ipa_tdesc (int idx)
{
#define SET_REGMAP(regmap, skip_last) \
do { \
s390_regmap = regmap; \
s390_regnum = (sizeof regmap / sizeof regmap[0]) - skip_last; \
} while(0)
switch (idx)
{
#ifdef __s390x__
case S390_TDESC_64:
/* Subtract number of VX regs. */
SET_REGMAP(s390x_ft_collect_regmap, 32);
return tdesc_s390x_linux64;
case S390_TDESC_64V1:
SET_REGMAP(s390x_ft_collect_regmap, 32);
return tdesc_s390x_linux64v1;
case S390_TDESC_64V2:
SET_REGMAP(s390x_ft_collect_regmap, 32);
return tdesc_s390x_linux64v2;
case S390_TDESC_TE:
SET_REGMAP(s390x_te_ft_collect_regmap, 32);
return tdesc_s390x_te_linux64;
case S390_TDESC_VX:
SET_REGMAP(s390x_ft_collect_regmap, 0);
return tdesc_s390x_vx_linux64;
case S390_TDESC_TEVX:
SET_REGMAP(s390x_te_ft_collect_regmap, 0);
return tdesc_s390x_tevx_linux64;
case S390_TDESC_GS:
SET_REGMAP(s390x_te_ft_collect_regmap, 0);
return tdesc_s390x_gs_linux64;
#else
case S390_TDESC_32:
SET_REGMAP(s390_linux32_ft_collect_regmap, 0);
return tdesc_s390_linux32;
case S390_TDESC_32V1:
SET_REGMAP(s390_linux32_ft_collect_regmap, 0);
return tdesc_s390_linux32v1;
case S390_TDESC_32V2:
SET_REGMAP(s390_linux32_ft_collect_regmap, 0);
return tdesc_s390_linux32v2;
case S390_TDESC_64:
SET_REGMAP(s390_linux64_ft_collect_regmap, 32);
return tdesc_s390_linux64;
case S390_TDESC_64V1:
SET_REGMAP(s390_linux64_ft_collect_regmap, 32);
return tdesc_s390_linux64v1;
case S390_TDESC_64V2:
SET_REGMAP(s390_linux64_ft_collect_regmap, 32);
return tdesc_s390_linux64v2;
case S390_TDESC_TE:
SET_REGMAP(s390_te_linux64_ft_collect_regmap, 32);
return tdesc_s390_te_linux64;
case S390_TDESC_VX:
SET_REGMAP(s390_linux64_ft_collect_regmap, 0);
return tdesc_s390_vx_linux64;
case S390_TDESC_TEVX:
SET_REGMAP(s390_te_linux64_ft_collect_regmap, 0);
return tdesc_s390_tevx_linux64;
case S390_TDESC_GS:
SET_REGMAP(s390_te_linux64_ft_collect_regmap, 0);
return tdesc_s390_gs_linux64;
#endif
default:
internal_error ("unknown ipa tdesc index: %d", idx);
#ifdef __s390x__
return tdesc_s390x_linux64;
#else
return tdesc_s390_linux32;
#endif
}
}
/* Allocate buffer for the jump pads. On 31-bit, JG reaches everywhere,
so just allocate normally. On 64-bit, we have +/-4GiB of reach, and
the executable is usually mapped at 0x80000000 - aim for somewhere
below it. */
void *
alloc_jump_pad_buffer (size_t size)
{
#ifdef __s390x__
uintptr_t addr;
uintptr_t exec_base = getauxval (AT_PHDR);
int pagesize;
void *res;
if (exec_base == 0)
exec_base = 0x80000000;
pagesize = sysconf (_SC_PAGE_SIZE);
if (pagesize == -1)
perror_with_name ("sysconf");
addr = exec_base - size;
/* size should already be page-aligned, but this can't hurt. */
addr &= ~(pagesize - 1);
/* Search for a free area. If we hit 0, we're out of luck. */
for (; addr; addr -= pagesize)
{
/* No MAP_FIXED - we don't want to zap someone's mapping. */
res = mmap ((void *) addr, size,
PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
/* If we got what we wanted, return. */
if ((uintptr_t) res == addr)
return res;
/* If we got a mapping, but at a wrong address, undo it. */
if (res != MAP_FAILED)
munmap (res, size);
}
return NULL;
#else
void *res = mmap (NULL, size, PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (res == MAP_FAILED)
return NULL;
return res;
#endif
}
void
initialize_low_tracepoint (void)
{
#ifdef __s390x__
init_registers_s390x_linux64 ();
init_registers_s390x_linux64v1 ();
init_registers_s390x_linux64v2 ();
init_registers_s390x_te_linux64 ();
init_registers_s390x_vx_linux64 ();
init_registers_s390x_tevx_linux64 ();
init_registers_s390x_gs_linux64 ();
#else
init_registers_s390_linux32 ();
init_registers_s390_linux32v1 ();
init_registers_s390_linux32v2 ();
init_registers_s390_linux64 ();
init_registers_s390_linux64v1 ();
init_registers_s390_linux64v2 ();
init_registers_s390_te_linux64 ();
init_registers_s390_vx_linux64 ();
init_registers_s390_tevx_linux64 ();
init_registers_s390_gs_linux64 ();
#endif
}