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[Qemu-devel] [PATCH 3/3] capstone: Enable disassembly for s390x
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PATCH 3/3] capstone: Enable disassembly for s390x |
Date: |
Wed, 22 May 2019 22:42:29 -0400 |
Enable s390x, aka SYSZ, in the git submodule build.
Set the capstone parameters for both s390x host and guest.
Install a skipdata hook to keep capstone in sync with the
instruction stream for unknown opcodes.
Signed-off-by: Richard Henderson <address@hidden>
---
Makefile | 1 +
disas.c | 40 ++++++++++++++++++++++++++++++++++++++++
target/s390x/cpu.c | 4 ++++
3 files changed, 45 insertions(+)
diff --git a/Makefile b/Makefile
index 155f066a20..a37e872825 100644
--- a/Makefile
+++ b/Makefile
@@ -477,6 +477,7 @@ CAP_CFLAGS += -DCAPSTONE_USE_SYS_DYN_MEM
CAP_CFLAGS += -DCAPSTONE_HAS_ARM
CAP_CFLAGS += -DCAPSTONE_HAS_ARM64
CAP_CFLAGS += -DCAPSTONE_HAS_POWERPC
+CAP_CFLAGS += -DCAPSTONE_HAS_SYSZ
CAP_CFLAGS += -DCAPSTONE_HAS_X86
subdir-capstone: .git-submodule-status
diff --git a/disas.c b/disas.c
index 41ad0102e2..c1ecd2d769 100644
--- a/disas.c
+++ b/disas.c
@@ -179,6 +179,39 @@ static int print_insn_od_target(bfd_vma pc,
disassemble_info *info)
to share this across calls and across host vs target disassembly. */
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. */
/* ??? It would be nice to cache this. We would need one handle for the
host and one for the target. For most targets we can reset specific
@@ -209,6 +242,10 @@ 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_SYSZ) {
+ cs_option(*handle, CS_OPT_SKIPDATA_SETUP,
+ (uintptr_t)&cap_skipdata_s390x);
+ }
/* Allocate temp space for cs_disasm_iter. */
if (cap_insn == NULL) {
@@ -551,6 +588,9 @@ void disas(FILE *out, void *code, unsigned long size)
print_insn = print_insn_m68k;
#elif defined(__s390__)
print_insn = print_insn_s390;
+ s.info.cap_arch = CS_ARCH_SYSZ;
+ s.info.cap_insn_unit = 2;
+ s.info.cap_insn_split = 6;
#elif defined(__hppa__)
print_insn = print_insn_hppa;
#endif
diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c
index b1df63d82c..553571d86b 100644
--- a/target/s390x/cpu.c
+++ b/target/s390x/cpu.c
@@ -41,6 +41,7 @@
#include "sysemu/sysemu.h"
#endif
#include "fpu/softfloat.h"
+#include "disas/capstone.h"
#define CR0_RESET 0xE0UL
#define CR14_RESET 0xC2000000UL;
@@ -175,6 +176,9 @@ static void s390_cpu_disas_set_info(CPUState *cpu,
disassemble_info *info)
{
info->mach = bfd_mach_s390_64;
info->print_insn = print_insn_s390;
+ info->cap_arch = CS_ARCH_SYSZ;
+ info->cap_insn_unit = 2;
+ info->cap_insn_split = 6;
}
static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
--
2.17.1