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target/arm: Move BE32 disassembler fixup

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The Capstone disassembler has its own big-endian fixup.
Doing this twice does not work, of course.  Move our current
fixup from target/arm/cpu.c to disas/arm.c.

This makes read_memory_inner_func unused and can be removed.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2017-10-19 14:10:45 -07:00
parent 0eea8cdd6d
commit 6cd61517fb
3 changed files with 16 additions and 31 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

21
disas/arm.c
View file

@ -70,6 +70,17 @@ static void floatformat_to_double (unsigned char *data, double *dest)
*dest = u.f;
}
static int arm_read_memory(bfd_vma memaddr, bfd_byte *b, int length,
struct disassemble_info *info)
{
assert((info->flags & INSN_ARM_BE32) == 0 || length == 2 || length == 4);
if ((info->flags & INSN_ARM_BE32) != 0 && length == 2) {
memaddr ^= 2;
}
return info->read_memory_func(memaddr, b, length, info);
}
/* End of qemu specific additions. */
struct opcode32
@ -3810,7 +3821,7 @@ find_ifthen_state (bfd_vma pc, struct disassemble_info *info,
return;
}
addr -= 2;
status = info->read_memory_func (addr, (bfd_byte *)b, 2, info);
status = arm_read_memory (addr, (bfd_byte *)b, 2, info);
if (status)
return;
@ -3882,7 +3893,7 @@ print_insn_arm (bfd_vma pc, struct disassemble_info *info)
info->bytes_per_chunk = size;
printer = print_insn_data;
status = info->read_memory_func (pc, (bfd_byte *)b, size, info);
status = arm_read_memory (pc, (bfd_byte *)b, size, info);
given = 0;
if (little)
for (i = size - 1; i >= 0; i--)
@ -3899,7 +3910,7 @@ print_insn_arm (bfd_vma pc, struct disassemble_info *info)
info->bytes_per_chunk = 4;
size = 4;
status = info->read_memory_func (pc, (bfd_byte *)b, 4, info);
status = arm_read_memory (pc, (bfd_byte *)b, 4, info);
if (little)
given = (b[0]) | (b[1] << 8) | (b[2] << 16) | ((unsigned)b[3] << 24);
else
@ -3915,7 +3926,7 @@ print_insn_arm (bfd_vma pc, struct disassemble_info *info)
info->bytes_per_chunk = 2;
size = 2;
status = info->read_memory_func (pc, (bfd_byte *)b, 2, info);
status = arm_read_memory (pc, (bfd_byte *)b, 2, info);
if (little)
given = (b[0]) | (b[1] << 8);
else
@ -3929,7 +3940,7 @@ print_insn_arm (bfd_vma pc, struct disassemble_info *info)
|| (given & 0xF800) == 0xF000
|| (given & 0xF800) == 0xE800)
{
status = info->read_memory_func (pc + 2, (bfd_byte *)b, 2, info);
status = arm_read_memory (pc + 2, (bfd_byte *)b, 2, info);
if (little)
given = (b[0]) | (b[1] << 8) | (given << 16);
else

7
include/disas/bfd.h
View file

@ -307,12 +307,6 @@ typedef struct disassemble_info {
(bfd_vma memaddr, bfd_byte *myaddr, int length,
struct disassemble_info *info);
/* A place to stash the real read_memory_func if read_memory_func wants to
do some funky address arithmetic or similar (e.g. for ARM BE32 mode). */
int (*read_memory_inner_func)
(bfd_vma memaddr, bfd_byte *myaddr, int length,
struct disassemble_info *info);
/* Function which should be called if we get an error that we can't
recover from. STATUS is the errno value from read_memory_func and
MEMADDR is the address that we were trying to read. INFO is a
@ -479,7 +473,6 @@ int generic_symbol_at_address(bfd_vma, struct disassemble_info *);
(INFO).buffer_vma = 0, \
(INFO).buffer_length = 0, \
(INFO).read_memory_func = buffer_read_memory, \
(INFO).read_memory_inner_func = NULL, \
(INFO).memory_error_func = perror_memory, \
(INFO).print_address_func = generic_print_address, \
(INFO).print_insn = NULL, \

19
target/arm/cpu.c
View file

@ -473,21 +473,6 @@ print_insn_thumb1(bfd_vma pc, disassemble_info *info)
return print_insn_arm(pc | 1, info);
}
static int arm_read_memory_func(bfd_vma memaddr, bfd_byte *b,
int length, struct disassemble_info *info)
{
assert(info->read_memory_inner_func);
assert((info->flags & INSN_ARM_BE32) == 0 || length == 2 || length == 4);
if ((info->flags & INSN_ARM_BE32) != 0 && length == 2) {
assert(info->endian == BFD_ENDIAN_LITTLE);
return info->read_memory_inner_func(memaddr ^ 2, (bfd_byte *)b, 2,
info);
} else {
return info->read_memory_inner_func(memaddr, b, length, info);
}
}
static void arm_disas_set_info(CPUState *cpu, disassemble_info *info)
{
ARMCPU *ac = ARM_CPU(cpu);
@ -513,10 +498,6 @@ static void arm_disas_set_info(CPUState *cpu, disassemble_info *info)
info->endian = BFD_ENDIAN_BIG;
#endif
}
if (info->read_memory_inner_func == NULL) {
info->read_memory_inner_func = info->read_memory_func;
info->read_memory_func = arm_read_memory_func;
}
info->flags &= ~INSN_ARM_BE32;
if (arm_sctlr_b(env)) {
info->flags |= INSN_ARM_BE32;