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disas/capstone: Add skipdata hook for s390x

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It is always possible to tell the length of an insn, even if the
actual insn is unknown.  Skip the correct number of bytes, so that
we stay in sync with the instruction stream.

Acked-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2020-09-11 18:19:41 -07:00
parent 3d56284524
commit c6d3da962f
1 changed files with 41 additions and 1 deletions
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42
disas/capstone.c
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@ -16,6 +16,39 @@
*/
static __thread cs_insn *cap_insn;
/*
* The capstone library always skips 2 bytes for S390X.
* This is less than ideal, since we can tell from the first two bits
* the size of the insn and thus stay in sync with the insn stream.
*/
static size_t CAPSTONE_API
cap_skipdata_s390x_cb(const uint8_t *code, size_t code_size,
size_t offset, void *user_data)
{
size_t ilen;
/* See get_ilen() in target/s390x/internal.h. */
switch (code[offset] >> 6) {
case 0:
ilen = 2;
break;
case 1:
case 2:
ilen = 4;
break;
default:
ilen = 6;
break;
}
return ilen;
}
static const cs_opt_skipdata cap_skipdata_s390x = {
.mnemonic = ".byte",
.callback = cap_skipdata_s390x_cb
};
/*
* Initialize the Capstone library.
*
@ -42,13 +75,20 @@ static cs_err cap_disas_start(disassemble_info *info, csh *handle)
/* "Disassemble" unknown insns as ".byte W,X,Y,Z". */
cs_option(*handle, CS_OPT_SKIPDATA, CS_OPT_ON);
if (info->cap_arch == CS_ARCH_X86) {
switch (info->cap_arch) {
case CS_ARCH_SYSZ:
cs_option(*handle, CS_OPT_SKIPDATA_SETUP,
(uintptr_t)&cap_skipdata_s390x);
break;
case CS_ARCH_X86:
/*
* We don't care about errors (if for some reason the library
* is compiled without AT&T syntax); the user will just have
* to deal with the Intel syntax.
*/
cs_option(*handle, CS_OPT_SYNTAX, CS_OPT_SYNTAX_ATT);
break;
}
/* Allocate temp space for cs_disasm_iter. */