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disas/nanomips: Split out read_u16

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Split out a helper function for reading a uint16_t
with the correct endianness.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20221106023735.5277-4-richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2022-11-06 13:37:32 +11:00 committed by Philippe Mathieu-Daudé
parent ad120616ed
commit 1414e3f565
1 changed files with 19 additions and 29 deletions
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48
disas/nanomips.c
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@ -21918,10 +21918,24 @@ static bool nanomips_dis(const uint16_t *data, char **buf, Dis_info *info)
return Disassemble(data, buf, &type, MAJOR, ARRAY_SIZE(MAJOR), info) >= 0;
}
static bool read_u16(uint16_t *ret, bfd_vma memaddr,
struct disassemble_info *info)
{
int status = (*info->read_memory_func)(memaddr, (bfd_byte *)ret, 2, info);
if (status != 0) {
(*info->memory_error_func)(status, memaddr, info);
return false;
}
if ((info->endian == BFD_ENDIAN_BIG) != HOST_BIG_ENDIAN) {
bswap16s(ret);
}
return true;
}
int print_insn_nanomips(bfd_vma memaddr, struct disassemble_info *info)
{
int status, length;
bfd_byte buffer[2];
int length;
uint16_t words[3] = { };
g_autofree char *buf = NULL;
@ -21939,48 +21953,24 @@ int print_insn_nanomips(bfd_vma memaddr, struct disassemble_info *info)
disassm_info.fprintf_func = info->fprintf_func;
disassm_info.stream = info->stream;
status = (*info->read_memory_func)(memaddr, buffer, 2, info);
if (status != 0) {
(*info->memory_error_func)(status, memaddr, info);
if (!read_u16(&words[0], memaddr, info)) {
return -1;
}
if (info->endian == BFD_ENDIAN_BIG) {
words[0] = bfd_getb16(buffer);
} else {
words[0] = bfd_getl16(buffer);
}
length = 2;
/* Handle 32-bit opcodes. */
if ((words[0] & 0x1000) == 0) {
status = (*info->read_memory_func)(memaddr + 2, buffer, 2, info);
if (status != 0) {
(*info->memory_error_func)(status, memaddr + 2, info);
if (!read_u16(&words[1], memaddr + 2, info)) {
return -1;
}
if (info->endian == BFD_ENDIAN_BIG) {
words[1] = bfd_getb16(buffer);
} else {
words[1] = bfd_getl16(buffer);
}
length = 4;
}
/* Handle 48-bit opcodes. */
if ((words[0] >> 10) == 0x18) {
status = (*info->read_memory_func)(memaddr + 4, buffer, 2, info);
if (status != 0) {
(*info->memory_error_func)(status, memaddr + 4, info);
if (!read_u16(&words[1], memaddr + 4, info)) {
return -1;
}
if (info->endian == BFD_ENDIAN_BIG) {
words[2] = bfd_getb16(buffer);
} else {
words[2] = bfd_getl16(buffer);
}
length = 6;
}