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/* GNU/Linux/PowerPC 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 "server.h"
#include <sys/mman.h>
#include "tracepoint.h"
#include "arch/ppc-linux-tdesc.h"
#include "linux-ppc-tdesc-init.h"
#include <elf.h>
#ifdef HAVE_GETAUXVAL
#include <sys/auxv.h>
#endif
/* These macros define the position of registers in the buffer collected
by the fast tracepoint jump pad. */
#define FT_CR_R0 0
#define FT_CR_CR 32
#define FT_CR_XER 33
#define FT_CR_LR 34
#define FT_CR_CTR 35
#define FT_CR_PC 36
#define FT_CR_GPR(n) (FT_CR_R0 + (n))
static const int ppc_ft_collect_regmap[] = {
/* GPRs */
FT_CR_GPR (0), FT_CR_GPR (1), FT_CR_GPR (2),
FT_CR_GPR (3), FT_CR_GPR (4), FT_CR_GPR (5),
FT_CR_GPR (6), FT_CR_GPR (7), FT_CR_GPR (8),
FT_CR_GPR (9), FT_CR_GPR (10), FT_CR_GPR (11),
FT_CR_GPR (12), FT_CR_GPR (13), FT_CR_GPR (14),
FT_CR_GPR (15), FT_CR_GPR (16), FT_CR_GPR (17),
FT_CR_GPR (18), FT_CR_GPR (19), FT_CR_GPR (20),
FT_CR_GPR (21), FT_CR_GPR (22), FT_CR_GPR (23),
FT_CR_GPR (24), FT_CR_GPR (25), FT_CR_GPR (26),
FT_CR_GPR (27), FT_CR_GPR (28), FT_CR_GPR (29),
FT_CR_GPR (30), FT_CR_GPR (31),
/* FPRs - not collected. */
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
FT_CR_PC, /* PC */
-1, /* MSR */
FT_CR_CR, /* CR */
FT_CR_LR, /* LR */
FT_CR_CTR, /* CTR */
FT_CR_XER, /* XER */
-1, /* FPSCR */
};
#define PPC_NUM_FT_COLLECT_GREGS \
(sizeof (ppc_ft_collect_regmap) / sizeof(ppc_ft_collect_regmap[0]))
/* Supply registers collected by the fast tracepoint jump pad.
BUF is the second argument we pass to gdb_collect in jump pad. */
void
supply_fast_tracepoint_registers (struct regcache *regcache,
const unsigned char *buf)
{
int i;
for (i = 0; i < PPC_NUM_FT_COLLECT_GREGS; i++)
{
if (ppc_ft_collect_regmap[i] == -1)
continue;
supply_register (regcache, i,
((char *) buf)
+ ppc_ft_collect_regmap[i] * sizeof (long));
}
}
/* Return the value of register REGNUM. RAW_REGS is collected buffer
by jump pad. This function is called by emit_reg. */
ULONGEST
get_raw_reg (const unsigned char *raw_regs, int regnum)
{
if (regnum >= PPC_NUM_FT_COLLECT_GREGS)
return 0;
if (ppc_ft_collect_regmap[regnum] == -1)
return 0;
return *(unsigned long *) (raw_regs
+ ppc_ft_collect_regmap[regnum] * sizeof (long));
}
/* Allocate buffer for the jump pads. The branch instruction has a reach
of +/- 32MiB, and the executable is loaded at 0x10000000 (256MiB).
64-bit: To maximize the area of executable that can use tracepoints,
try allocating at 0x10000000 - size initially, decreasing until we hit
a free area.
32-bit: ld.so loads dynamic libraries right below the executable, so
we cannot depend on that area (dynamic libraries can be quite large).
Instead, aim right after the executable - at sbrk(0). This will
cause future brk to fail, and malloc will fallback to mmap. */
void *
alloc_jump_pad_buffer (size_t size)
{
#ifdef __powerpc64__
uintptr_t addr;
uintptr_t exec_base = getauxval (AT_PHDR);
int pagesize;
void *res;
if (exec_base == 0)
exec_base = 0x10000000;
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 *target = sbrk (0);
void *res = mmap (target, size, PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (res == target)
return res;
if (res != MAP_FAILED)
munmap (res, size);
return NULL;
#endif
}
/* Return target_desc to use for IPA, given the tdesc index passed by
gdbserver. */
const struct target_desc *
get_ipa_tdesc (int idx)
{
switch (idx)
{
#ifdef __powerpc64__
case PPC_TDESC_BASE:
return tdesc_powerpc_64l;
case PPC_TDESC_ALTIVEC:
return tdesc_powerpc_altivec64l;
case PPC_TDESC_VSX:
return tdesc_powerpc_vsx64l;
case PPC_TDESC_ISA205:
return tdesc_powerpc_isa205_64l;
case PPC_TDESC_ISA205_ALTIVEC:
return tdesc_powerpc_isa205_altivec64l;
case PPC_TDESC_ISA205_VSX:
return tdesc_powerpc_isa205_vsx64l;
case PPC_TDESC_ISA205_PPR_DSCR_VSX:
return tdesc_powerpc_isa205_ppr_dscr_vsx64l;
case PPC_TDESC_ISA207_VSX:
return tdesc_powerpc_isa207_vsx64l;
case PPC_TDESC_ISA207_HTM_VSX:
return tdesc_powerpc_isa207_htm_vsx64l;
#else
case PPC_TDESC_BASE:
return tdesc_powerpc_32l;
case PPC_TDESC_ALTIVEC:
return tdesc_powerpc_altivec32l;
case PPC_TDESC_VSX:
return tdesc_powerpc_vsx32l;
case PPC_TDESC_ISA205:
return tdesc_powerpc_isa205_32l;
case PPC_TDESC_ISA205_ALTIVEC:
return tdesc_powerpc_isa205_altivec32l;
case PPC_TDESC_ISA205_VSX:
return tdesc_powerpc_isa205_vsx32l;
case PPC_TDESC_ISA205_PPR_DSCR_VSX:
return tdesc_powerpc_isa205_ppr_dscr_vsx32l;
case PPC_TDESC_ISA207_VSX:
return tdesc_powerpc_isa207_vsx32l;
case PPC_TDESC_ISA207_HTM_VSX:
return tdesc_powerpc_isa207_htm_vsx32l;
case PPC_TDESC_E500:
return tdesc_powerpc_e500l;
#endif
default:
internal_error ("unknown ipa tdesc index: %d", idx);
#ifdef __powerpc64__
return tdesc_powerpc_64l;
#else
return tdesc_powerpc_32l;
#endif
}
}
/* Initialize ipa_tdesc and others. */
void
initialize_low_tracepoint (void)
{
#ifdef __powerpc64__
init_registers_powerpc_64l ();
init_registers_powerpc_altivec64l ();
init_registers_powerpc_vsx64l ();
init_registers_powerpc_isa205_64l ();
init_registers_powerpc_isa205_altivec64l ();
init_registers_powerpc_isa205_vsx64l ();
init_registers_powerpc_isa205_ppr_dscr_vsx64l ();
init_registers_powerpc_isa207_vsx64l ();
init_registers_powerpc_isa207_htm_vsx64l ();
#else
init_registers_powerpc_32l ();
init_registers_powerpc_altivec32l ();
init_registers_powerpc_vsx32l ();
init_registers_powerpc_isa205_32l ();
init_registers_powerpc_isa205_altivec32l ();
init_registers_powerpc_isa205_vsx32l ();
init_registers_powerpc_isa205_ppr_dscr_vsx32l ();
init_registers_powerpc_isa207_vsx32l ();
init_registers_powerpc_isa207_htm_vsx32l ();
init_registers_powerpc_e500l ();
#endif
}
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