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/* memory.c -- Memory accessor functions for the AArch64 simulator
Copyright (C) 2015-2021 Free Software Foundation, Inc.
Contributed by Red Hat.
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 "config.h"
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "libiberty.h"
#include "memory.h"
#include "simulator.h"
#include "sim-core.h"
static inline void
mem_error (sim_cpu *cpu, const char *message, uint64_t addr)
{
TRACE_MEMORY (cpu, "ERROR: %s: %" PRIx64, message, addr);
}
/* FIXME: AArch64 requires aligned memory access if SCTRLR_ELx.A is set,
but we are not implementing that here. */
#define FETCH_FUNC64(RETURN_TYPE, ACCESS_TYPE, NAME, N) \
RETURN_TYPE \
aarch64_get_mem_##NAME (sim_cpu *cpu, uint64_t address) \
{ \
RETURN_TYPE val = (RETURN_TYPE) (ACCESS_TYPE) \
sim_core_read_unaligned_##N (cpu, 0, read_map, address); \
TRACE_MEMORY (cpu, "read of %" PRIx64 " (%d bytes) from %" PRIx64, \
val, N, address); \
\
return val; \
}
FETCH_FUNC64 (uint64_t, uint64_t, u64, 8)
FETCH_FUNC64 (int64_t, int64_t, s64, 8)
#define FETCH_FUNC32(RETURN_TYPE, ACCESS_TYPE, NAME, N) \
RETURN_TYPE \
aarch64_get_mem_##NAME (sim_cpu *cpu, uint64_t address) \
{ \
RETURN_TYPE val = (RETURN_TYPE) (ACCESS_TYPE) \
sim_core_read_unaligned_##N (cpu, 0, read_map, address); \
TRACE_MEMORY (cpu, "read of %8x (%d bytes) from %" PRIx64, \
val, N, address); \
\
return val; \
}
FETCH_FUNC32 (uint32_t, uint32_t, u32, 4)
FETCH_FUNC32 (int32_t, int32_t, s32, 4)
FETCH_FUNC32 (uint32_t, uint16_t, u16, 2)
FETCH_FUNC32 (int32_t, int16_t, s16, 2)
FETCH_FUNC32 (uint32_t, uint8_t, u8, 1)
FETCH_FUNC32 (int32_t, int8_t, s8, 1)
void
aarch64_get_mem_long_double (sim_cpu *cpu, uint64_t address, FRegister *a)
{
a->v[0] = sim_core_read_unaligned_8 (cpu, 0, read_map, address);
a->v[1] = sim_core_read_unaligned_8 (cpu, 0, read_map, address + 8);
}
/* FIXME: Aarch64 requires aligned memory access if SCTRLR_ELx.A is set,
but we are not implementing that here. */
#define STORE_FUNC(TYPE, NAME, N) \
void \
aarch64_set_mem_##NAME (sim_cpu *cpu, uint64_t address, TYPE value) \
{ \
TRACE_MEMORY (cpu, \
"write of %" PRIx64 " (%d bytes) to %" PRIx64, \
(uint64_t) value, N, address); \
\
sim_core_write_unaligned_##N (cpu, 0, write_map, address, value); \
}
STORE_FUNC (uint64_t, u64, 8)
STORE_FUNC (int64_t, s64, 8)
STORE_FUNC (uint32_t, u32, 4)
STORE_FUNC (int32_t, s32, 4)
STORE_FUNC (uint16_t, u16, 2)
STORE_FUNC (int16_t, s16, 2)
STORE_FUNC (uint8_t, u8, 1)
STORE_FUNC (int8_t, s8, 1)
void
aarch64_set_mem_long_double (sim_cpu *cpu, uint64_t address, FRegister a)
{
TRACE_MEMORY (cpu,
"write of long double %" PRIx64 " %" PRIx64 " to %" PRIx64,
a.v[0], a.v[1], address);
sim_core_write_unaligned_8 (cpu, 0, write_map, address, a.v[0]);
sim_core_write_unaligned_8 (cpu, 0, write_map, address + 8, a.v[1]);
}
void
aarch64_get_mem_blk (sim_cpu * cpu,
uint64_t address,
char * buffer,
unsigned length)
{
unsigned len;
len = sim_core_read_buffer (CPU_STATE (cpu), cpu, read_map,
buffer, address, length);
if (len == length)
return;
memset (buffer, 0, length);
if (cpu)
mem_error (cpu, "read of non-existant mem block at", address);
sim_engine_halt (CPU_STATE (cpu), cpu, NULL, aarch64_get_PC (cpu),
sim_stopped, SIM_SIGBUS);
}
const char *
aarch64_get_mem_ptr (sim_cpu *cpu, uint64_t address)
{
char *addr = sim_core_trans_addr (CPU_STATE (cpu), cpu, read_map, address);
if (addr == NULL)
{
mem_error (cpu, "request for non-existant mem addr of", address);
sim_engine_halt (CPU_STATE (cpu), cpu, NULL, aarch64_get_PC (cpu),
sim_stopped, SIM_SIGBUS);
}
return addr;
}
/* We implement a combined stack and heap. That way the sbrk()
function in libgloss/aarch64/syscalls.c has a chance to detect
an out-of-memory condition by noticing a stack/heap collision.
The heap starts at the end of loaded memory and carries on up
to an arbitary 2Gb limit. */
uint64_t
aarch64_get_heap_start (sim_cpu *cpu)
{
uint64_t heap = trace_sym_value (CPU_STATE (cpu), "end");
if (heap == 0)
heap = trace_sym_value (CPU_STATE (cpu), "_end");
if (heap == 0)
{
heap = STACK_TOP - 0x100000;
sim_io_eprintf (CPU_STATE (cpu),
"Unable to find 'end' symbol - using addr based "
"upon stack instead %" PRIx64 "\n",
heap);
}
return heap;
}
uint64_t
aarch64_get_stack_start (sim_cpu *cpu)
{
if (aarch64_get_heap_start (cpu) >= STACK_TOP)
mem_error (cpu, "executable is too big", aarch64_get_heap_start (cpu));
return STACK_TOP;
}
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