/*
* Copyright (c) 2008, 2021, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* The Universal Permissive License (UPL), Version 1.0
*
* Subject to the condition set forth below, permission is hereby granted to
* any person obtaining a copy of this software, associated documentation
* and/or data (collectively the "Software"), free of charge and under any
* and all copyright rights in the Software, and any and all patent rights
* owned or freely licensable by each licensor hereunder covering either (i)
* the unmodified Software as contributed to or provided by such licensor,
* or (ii) the Larger Works (as defined below), to deal in both
*
* (a) the Software, and
*
* (b) any piece of software and/or hardware listed in the lrgrwrks.txt file
* if one is included with the Software (each a "Larger Work" to which the
* Software is contributed by such licensors),
*
* without restriction, including without limitation the rights to copy,
* create derivative works of, display, perform, and distribute the Software
* and make, use, sell, offer for sale, import, export, have made, and have
* sold the Software and the Larger Work(s), and to sublicense the foregoing
* rights on either these or other terms.
*
* This license is subject to the following condition:
*
* The above copyright notice and either this complete permission notice or
* at a minimum a reference to the UPL must be included in all copies or
* substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
* NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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*
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*/
/* hsdis.c -- dump a range of addresses as native instructions
This implements the plugin protocol required by the
HotSpot PrintAssembly option.
*/
#ifndef SYSTEM_BINUTILS
#include <config.h> /* required by bfd.h */
#endif
#include <errno.h>
#include <inttypes.h>
#include <string.h>
#include <libiberty.h>
#include <bfd.h>
#include <dis-asm.h>
#include "hsdis.h"
#ifndef bool
#define bool int
#define true 1
#define false 0
#endif /*bool*/
/* short names for stuff in hsdis.h */
typedef decode_instructions_event_callback_ftype event_callback_t;
typedef decode_instructions_printf_callback_ftype printf_callback_t;
/* disassemble_info.application_data object */
struct hsdis_app_data {
/* virtual address of data */
uintptr_t start_va, end_va;
/* the instructions to be decoded */
unsigned char* buffer;
uintptr_t length;
event_callback_t event_callback; void* event_stream;
printf_callback_t printf_callback; void* printf_stream;
bool losing;
bool do_newline;
/* the architecture being disassembled */
const char* arch_name;
const bfd_arch_info_type* arch_info;
/* the disassembler we are going to use: */
disassembler_ftype dfn;
struct disassemble_info dinfo; /* the actual struct! */
char mach_option[64];
char insn_options[256];
};
static void* decode(struct hsdis_app_data* app_data, const char* options);
#define DECL_APP_DATA(dinfo) \
struct hsdis_app_data* app_data = (struct hsdis_app_data*) (dinfo)->application_data
#define DECL_EVENT_CALLBACK(app_data) \
event_callback_t event_callback = (app_data)->event_callback; \
void* event_stream = (app_data)->event_stream
#define DECL_PRINTF_CALLBACK(app_data) \
printf_callback_t printf_callback = (app_data)->printf_callback; \
void* printf_stream = (app_data)->printf_stream
static void print_help(struct hsdis_app_data* app_data,
const char* msg, const char* arg);
static void setup_app_data(struct hsdis_app_data* app_data,
const char* options);
static const char* format_insn_close(const char* close,
disassemble_info* dinfo,
char* buf, size_t bufsize);
void*
#ifdef DLL_ENTRY
DLL_ENTRY
#endif
decode_instructions_virtual(uintptr_t start_va, uintptr_t end_va,
unsigned char* buffer, uintptr_t length,
event_callback_t event_callback_arg, void* event_stream_arg,
printf_callback_t printf_callback_arg, void* printf_stream_arg,
const char* options, int newline) {
struct hsdis_app_data app_data;
memset(&app_data, 0, sizeof(app_data));
app_data.start_va = start_va;
app_data.end_va = end_va;
app_data.buffer = buffer;
app_data.length = length;
app_data.event_callback = event_callback_arg;
app_data.event_stream = event_stream_arg;
app_data.printf_callback = printf_callback_arg;
app_data.printf_stream = printf_stream_arg;
app_data.do_newline = newline == 0 ? false : true;
return decode(&app_data, options);
}
/* This is the compatability interface for older version of hotspot */
void*
#ifdef DLL_ENTRY
DLL_ENTRY
#endif
decode_instructions(void* start_pv, void* end_pv,
event_callback_t event_callback_arg, void* event_stream_arg,
printf_callback_t printf_callback_arg, void* printf_stream_arg,
const char* options) {
return decode_instructions_virtual((uintptr_t)start_pv,
(uintptr_t)end_pv,
(unsigned char*)start_pv,
(uintptr_t)end_pv - (uintptr_t)start_pv,
event_callback_arg,
event_stream_arg,
printf_callback_arg,
printf_stream_arg,
options, false);
}
static void* decode(struct hsdis_app_data* app_data, const char* options) {
setup_app_data(app_data, options);
char buf[128];
{
/* now reload everything from app_data: */
DECL_EVENT_CALLBACK(app_data);
DECL_PRINTF_CALLBACK(app_data);
uintptr_t start = app_data->start_va;
uintptr_t end = app_data->end_va;
uintptr_t p = start;
(*event_callback)(event_stream, "insns", (void*)start);
(*event_callback)(event_stream, "mach name='%s'",
(void*) app_data->arch_info->printable_name);
if (app_data->dinfo.bytes_per_line != 0) {
(*event_callback)(event_stream, "format bytes-per-line='%p'/",
(void*)(intptr_t) app_data->dinfo.bytes_per_line);
}
while (p < end && !app_data->losing) {
(*event_callback)(event_stream, "insn", (void*) p);
/* reset certain state, so we can read it with confidence */
app_data->dinfo.insn_info_valid = 0;
app_data->dinfo.branch_delay_insns = 0;
app_data->dinfo.data_size = 0;
app_data->dinfo.insn_type = 0;
int size = (*app_data->dfn)((bfd_vma) p, &app_data->dinfo);
if (size > 0) p += size;
else app_data->losing = true;
if (!app_data->losing) {
const char* insn_close = format_insn_close("/insn", &app_data->dinfo,
buf, sizeof(buf));
(*event_callback)(event_stream, insn_close, (void*) p);
if (app_data->do_newline) {
/* follow each complete insn by a nice newline */
(*printf_callback)(printf_stream, "\n");
}
}
}
if (app_data->losing) (*event_callback)(event_stream, "/insns", (void*) p);
return (void*) p;
}
}
/* take the address of the function, for luck, and also test the typedef: */
const decode_func_vtype decode_func_virtual_address = &decode_instructions_virtual;
const decode_func_stype decode_func_address = &decode_instructions;
static const char* format_insn_close(const char* close,
disassemble_info* dinfo,
char* buf, size_t bufsize) {
if (!dinfo->insn_info_valid)
return close;
enum dis_insn_type itype = dinfo->insn_type;
int dsize = dinfo->data_size, delays = dinfo->branch_delay_insns;
if ((itype == dis_nonbranch && (dsize | delays) == 0)
|| (strlen(close) + 3*20 > bufsize))
return close;
const char* type = "unknown";
switch (itype) {
case dis_nonbranch: type = NULL; break;
case dis_branch: type = "branch"; break;
case dis_condbranch: type = "condbranch"; break;
case dis_jsr: type = "jsr"; break;
case dis_condjsr: type = "condjsr"; break;
case dis_dref: type = "dref"; break;
case dis_dref2: type = "dref2"; break;
case dis_noninsn: type = "noninsn"; break;
}
strcpy(buf, close);
char* p = buf;
if (type) sprintf(p += strlen(p), " type='%s'", type);
if (dsize) sprintf(p += strlen(p), " dsize='%d'", dsize);
if (delays) sprintf(p += strlen(p), " delay='%d'", delays);
return buf;
}
/* handler functions */
static int
hsdis_read_memory_func(bfd_vma memaddr,
bfd_byte* myaddr,
unsigned int length,
struct disassemble_info* dinfo) {
DECL_APP_DATA(dinfo);
/* convert the virtual address memaddr into an address within memory buffer */
uintptr_t offset = ((uintptr_t) memaddr) - app_data->start_va;
if (offset + length > app_data->length) {
/* read is out of bounds */
return EIO;
} else {
memcpy(myaddr, (bfd_byte*) (app_data->buffer + offset), length);
return 0;
}
}
static void
hsdis_print_address_func(bfd_vma vma, struct disassemble_info* dinfo) {
/* the actual value to print: */
void* addr_value = (void*) (uintptr_t) vma;
DECL_APP_DATA(dinfo);
DECL_EVENT_CALLBACK(app_data);
/* issue the event: */
void* result =
(*event_callback)(event_stream, "addr/", addr_value);
if (result == NULL) {
/* event declined */
generic_print_address(vma, dinfo);
}
}
/* configuration */
static void set_optional_callbacks(struct hsdis_app_data* app_data);
static void parse_caller_options(struct hsdis_app_data* app_data,
const char* caller_options);
static const char* native_arch_name();
static enum bfd_endian native_endian();
static const bfd_arch_info_type* find_arch_info(const char* arch_nane);
static bfd* get_native_bfd(const bfd_arch_info_type* arch_info,
/* to avoid malloc: */
bfd* empty_bfd, bfd_target* empty_xvec);
static void init_disassemble_info_from_bfd(struct disassemble_info* dinfo,
void *stream,
fprintf_ftype fprintf_func,
bfd* bfd,
char* disassembler_options);
static void parse_fake_insn(disassembler_ftype dfn,
struct disassemble_info* dinfo);
static void setup_app_data(struct hsdis_app_data* app_data,
const char* caller_options) {
/* Make reasonable defaults for null callbacks.
A non-null stream for a null callback is assumed to be a FILE* for output.
Events are rendered as XML.
*/
set_optional_callbacks(app_data);
/* Look into caller_options for anything interesting. */
if (caller_options != NULL)
parse_caller_options(app_data, caller_options);
/* Discover which architecture we are going to disassemble. */
app_data->arch_name = &app_data->mach_option[0];
if (app_data->arch_name[0] == '\0')
app_data->arch_name = native_arch_name();
app_data->arch_info = find_arch_info(app_data->arch_name);
/* Make a fake bfd to hold the arch. and byteorder info. */
struct {
bfd_target empty_xvec;
bfd empty_bfd;
} buf;
bfd* native_bfd = get_native_bfd(app_data->arch_info,
/* to avoid malloc: */
&buf.empty_bfd, &buf.empty_xvec);
init_disassemble_info_from_bfd(&app_data->dinfo,
app_data->printf_stream,
app_data->printf_callback,
native_bfd,
/* On PowerPC we get warnings, if we pass empty options */
(caller_options == NULL) ? NULL : app_data->insn_options);
/* Finish linking together the various callback blocks. */
app_data->dinfo.application_data = (void*) app_data;
app_data->dfn = disassembler(bfd_get_arch(native_bfd),
bfd_big_endian(native_bfd),
bfd_get_mach(native_bfd),
native_bfd);
app_data->dinfo.print_address_func = hsdis_print_address_func;
app_data->dinfo.read_memory_func = hsdis_read_memory_func;
if (app_data->dfn == NULL) {
const char* bad = app_data->arch_name;
static bool complained;
if (bad == &app_data->mach_option[0])
print_help(app_data, "bad mach=%s", bad);
else if (!complained)
print_help(app_data, "bad native mach=%s; please port hsdis to this platform", bad);
complained = true;
/* must bail out */
app_data->losing = true;
return;
}
parse_fake_insn(app_data->dfn, &app_data->dinfo);
}
/* ignore all events, return a null */
static void* null_event_callback(void* ignore_stream, const char* ignore_event, void* arg) {
return NULL;
}
/* print all events as XML markup */
static void* xml_event_callback(void* stream, const char* event, void* arg) {
FILE* fp = (FILE*) stream;
#define NS_PFX "dis:"
if (event[0] != '/') {
/* issue the tag, with or without a formatted argument */
fprintf(fp, "<"NS_PFX);
fprintf(fp, event, arg);
fprintf(fp, ">");
} else {
++event; /* skip slash */
const char* argp = strchr(event, ' ');
if (argp == NULL) {
/* no arguments; just issue the closing tag */
fprintf(fp, "NS_PFX"%s>", event);
} else {
/* split out the closing attributes as <dis:foo_done attr='val'/> */
int event_prefix = (argp - event);
fprintf(fp, "<"NS_PFX"%.*s_done", event_prefix, event);
fprintf(fp, argp, arg);
fprintf(fp, "/>NS_PFX"%.*s>", event_prefix, event);
}
}
return NULL;
}
static void set_optional_callbacks(struct hsdis_app_data* app_data) {
if (app_data->printf_callback == NULL) {
int (*fprintf_callback)(FILE*, const char*, ...) = &fprintf;
FILE* fprintf_stream = stdout;
app_data->printf_callback = (printf_callback_t) fprintf_callback;
if (app_data->printf_stream == NULL)
app_data->printf_stream = (void*) fprintf_stream;
}
if (app_data->event_callback == NULL) {
if (app_data->event_stream == NULL)
app_data->event_callback = &null_event_callback;
else
app_data->event_callback = &xml_event_callback;
}
}
static void parse_caller_options(struct hsdis_app_data* app_data, const char* caller_options) {
char* iop_base = app_data->insn_options;
char* iop_limit = iop_base + sizeof(app_data->insn_options) - 1;
char* iop = iop_base;
const char* p;
for (p = caller_options; p != NULL; ) {
const char* q = strchr(p, ',');
size_t plen = (q == NULL) ? strlen(p) : ((q++) - p);
if (plen == 4 && strncmp(p, "help", plen) == 0) {
print_help(app_data, NULL, NULL);
} else if (plen >= 5 && strncmp(p, "mach=", 5) == 0) {
char* mach_option = app_data->mach_option;
size_t mach_size = sizeof(app_data->mach_option);
mach_size -= 1; /*leave room for the null*/
if (plen > mach_size) plen = mach_size;
strncpy(mach_option, p, plen);
mach_option[plen] = '\0';
} else if (plen > 6 && strncmp(p, "hsdis-", 6) == 0) {
// do not pass these to the next level
} else {
/* just copy it; {i386,sparc}-dis.c might like to see it */
if (iop > iop_base && iop < iop_limit) (*iop++) = ',';
if (iop + plen > iop_limit)
plen = iop_limit - iop;
strncpy(iop, p, plen);
iop += plen;
}
p = q;
}
*iop = '\0';
}
static void print_help(struct hsdis_app_data* app_data,
const char* msg, const char* arg) {
DECL_PRINTF_CALLBACK(app_data);
if (msg != NULL) {
(*printf_callback)(printf_stream, "hsdis: ");
(*printf_callback)(printf_stream, msg, arg);
(*printf_callback)(printf_stream, "\n");
}
(*printf_callback)(printf_stream, "hsdis output options:\n");
if (printf_callback == (printf_callback_t) &fprintf)
disassembler_usage((FILE*) printf_stream);
else
disassembler_usage(stderr); /* better than nothing */
(*printf_callback)(printf_stream, " mach= select disassembly mode\n");
#if defined(LIBARCH_i386) || defined(LIBARCH_amd64)
(*printf_callback)(printf_stream, " mach=i386 select 32-bit mode\n");
(*printf_callback)(printf_stream, " mach=x86-64 select 64-bit mode\n");
(*printf_callback)(printf_stream, " suffix always print instruction suffix\n");
#endif
(*printf_callback)(printf_stream, " help print this message\n");
}
/* low-level bfd and arch stuff that binutils doesn't do for us */
static const bfd_arch_info_type* find_arch_info(const char* arch_name) {
const bfd_arch_info_type* arch_info = bfd_scan_arch(arch_name);
if (arch_info == NULL) {
extern const bfd_arch_info_type bfd_default_arch_struct;
arch_info = &bfd_default_arch_struct;
}
return arch_info;
}
static const char* native_arch_name() {
const char* res = NULL;
#ifdef LIBARCH_i386
res = "i386";
#endif
#ifdef LIBARCH_amd64
res = "i386:x86-64";
#endif
#if defined(LIBARCH_ppc64) || defined(LIBARCH_ppc64le)
res = "powerpc:common64";
#endif
#ifdef LIBARCH_arm
res = "arm";
#endif
#ifdef LIBARCH_aarch64
res = "aarch64";
#endif
#ifdef LIBARCH_s390x
res = "s390:64-bit";
#endif
#ifdef LIBARCH_riscv64
res = "riscv:rv64";
#endif
if (res == NULL)
res = "architecture not set in Makefile!";
return res;
}
static enum bfd_endian native_endian() {
int32_t endian_test = 'x';
if (*(const char*) &endian_test == 'x')
return BFD_ENDIAN_LITTLE;
else
return BFD_ENDIAN_BIG;
}
static bfd* get_native_bfd(const bfd_arch_info_type* arch_info,
bfd* empty_bfd, bfd_target* empty_xvec) {
memset(empty_bfd, 0, sizeof(*empty_bfd));
memset(empty_xvec, 0, sizeof(*empty_xvec));
empty_xvec->flavour = bfd_target_unknown_flavour;
empty_xvec->byteorder = native_endian();
empty_bfd->xvec = empty_xvec;
empty_bfd->arch_info = arch_info;
return empty_bfd;
}
static int read_zero_data_only(bfd_vma ignore_p,
bfd_byte* myaddr, unsigned int length,
struct disassemble_info *ignore_info) {
memset(myaddr, 0, length);
return 0;
}
static int print_to_dev_null(void* ignore_stream, const char* ignore_format, ...) {
return 0;
}
/* Prime the pump by running the selected disassembler on a null input.
This forces the machine-specific disassembler to divulge invariant
information like bytes_per_line.
*/
static void parse_fake_insn(disassembler_ftype dfn,
struct disassemble_info* dinfo) {
typedef int (*read_memory_ftype)
(bfd_vma memaddr, bfd_byte *myaddr, unsigned int length,
struct disassemble_info *info);
read_memory_ftype read_memory_func = dinfo->read_memory_func;
fprintf_ftype fprintf_func = dinfo->fprintf_func;
dinfo->read_memory_func = &read_zero_data_only;
dinfo->fprintf_func = &print_to_dev_null;
(*dfn)(0, dinfo);
/* put it back */
dinfo->read_memory_func = read_memory_func;
dinfo->fprintf_func = fprintf_func;
}
static void init_disassemble_info_from_bfd(struct disassemble_info* dinfo,
void *stream,
fprintf_ftype fprintf_func,
bfd* abfd,
char* disassembler_options) {
init_disassemble_info(dinfo, stream, fprintf_func);
dinfo->flavour = bfd_get_flavour(abfd);
dinfo->arch = bfd_get_arch(abfd);
dinfo->mach = bfd_get_mach(abfd);
dinfo->disassembler_options = disassembler_options;
#ifdef SEC_ELF_OCTETS
/* bfd_octets_per_byte() has 2 args since binutils 2.34 */
dinfo->octets_per_byte = bfd_octets_per_byte (abfd, NULL);
#else
dinfo->octets_per_byte = bfd_octets_per_byte (abfd);
#endif
dinfo->skip_zeroes = sizeof(void*) * 2;
dinfo->skip_zeroes_at_end = sizeof(void*)-1;
dinfo->disassembler_needs_relocs = FALSE;
if (bfd_big_endian(abfd))
dinfo->display_endian = dinfo->endian = BFD_ENDIAN_BIG;
else if (bfd_little_endian(abfd))
dinfo->display_endian = dinfo->endian = BFD_ENDIAN_LITTLE;
else
dinfo->endian = native_endian();
disassemble_init_for_target(dinfo);
}
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