in_sdl: give names to gamepad buttons
[libpicofe.git] / linux / host_dasm.c
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1/*
2 * (C) GraÅžvydas "notaz" Ignotas, 2009-2010
3 *
4 * This work is licensed under the terms of any of these licenses
5 * (at your option):
6 * - GNU GPL, version 2 or later.
7 * - GNU LGPL, version 2.1 or later.
8 * - MAME license.
9 * See the COPYING file in the top-level directory.
10 */
11
12#include <stdio.h>
13#include <stdlib.h>
14#include <string.h>
15#include <stdarg.h>
16#include <bfd.h>
17#include <dis-asm.h>
18
19#include "host_dasm.h"
20
21extern char **g_argv;
22
23static struct disassemble_info di;
24static disassembler_ftype print_insn_func;
25
26#if defined __arm__
27//#define print_insn_func print_insn_little_arm
28#define BFD_ARCH bfd_arch_arm
29#define BFD_MACH bfd_mach_arm_unknown
30#define DASM_OPTS "reg-names-std"
31#elif defined __aarch64__
32//#define print_insn_func print_insn_aarch64
33#define BFD_ARCH bfd_arch_aarch64
34#define BFD_MACH bfd_mach_aarch64
35#define DASM_OPTS NULL
36#elif defined __mips__
37//#define print_insn_func print_insn_little_mips
38#define BFD_ARCH bfd_arch_mips
39#define BFD_MACH bfd_mach_mipsisa64r2
40#define DASM_OPTS NULL
41#elif defined __riscv
42//#define print_insn_func print_insn_riscv
43#define BFD_ARCH bfd_arch_riscv
44#define BFD_MACH bfd_mach_riscv64
45#define DASM_OPTS NULL
46#elif defined __powerpc__
47//#define print_insn_func print_insn_little_powerpc
48#define BFD_ARCH bfd_arch_powerpc
49#define BFD_MACH bfd_mach_ppc64
50#define DASM_OPTS NULL
51#elif defined(__x86_64__) || defined(__i386__)
52//#define print_insn_func print_insn_i386_intel
53#define BFD_ARCH bfd_arch_i386
54#ifdef __x86_64__
55#define BFD_MACH bfd_mach_x86_64_intel_syntax
56#else
57#define BFD_MACH bfd_mach_i386_i386_intel_syntax
58#endif
59#define DASM_OPTS NULL
60#else
61#error "missing arch support"
62#endif
63
64/* symbols */
65static asymbol **symbols;
66static long symcount, symstorage;
67static int init_done;
68
69/* Filter out (in place) symbols that are useless for disassembly.
70 COUNT is the number of elements in SYMBOLS.
71 Return the number of useful symbols. */
72static long
73remove_useless_symbols (asymbol **symbols, long count)
74{
75 asymbol **in_ptr = symbols, **out_ptr = symbols;
76
77 while (--count >= 0)
78 {
79 asymbol *sym = *in_ptr++;
80
81 if (sym->name == NULL || sym->name[0] == '\0' || sym->name[0] == '$')
82 continue;
83 if (sym->flags & (BSF_DEBUGGING | BSF_SECTION_SYM))
84 continue;
85 if (bfd_is_und_section (sym->section)
86 || bfd_is_com_section (sym->section))
87 continue;
88 if (sym->value + sym->section->vma == 0)
89 continue;
90/*
91 printf("sym: %08lx %04x %08x v %08x \"%s\"\n",
92 (unsigned int)sym->value, (unsigned int)sym->flags, (unsigned int)sym->udata.i,
93 (unsigned int)sym->section->vma, sym->name);
94*/
95 *out_ptr++ = sym;
96 }
97
98 return out_ptr - symbols;
99}
100
101static void slurp_symtab(const char *filename)
102{
103 bfd *abfd;
104
105 symcount = 0;
106
107 abfd = bfd_openr(filename, NULL);
108 if (abfd == NULL) {
109 fprintf(stderr, "failed to open: %s\n", filename);
110 goto no_symbols;
111 }
112
113 if (!bfd_check_format(abfd, bfd_object))
114 goto no_symbols;
115
116 if (!(bfd_get_file_flags(abfd) & HAS_SYMS))
117 goto no_symbols;
118
119 symstorage = bfd_get_symtab_upper_bound(abfd);
120 if (symstorage <= 0)
121 goto no_symbols;
122
123 symbols = malloc(symstorage);
124 if (symbols == NULL)
125 goto no_symbols;
126
127 symcount = bfd_canonicalize_symtab(abfd, symbols);
128 if (symcount < 0)
129 goto no_symbols;
130
131 symcount = remove_useless_symbols(symbols, symcount);
132// bfd_close(abfd);
133 return;
134
135no_symbols:
136 fprintf(stderr, "no symbols in %s\n", bfd_get_filename(abfd));
137 if (symbols != NULL)
138 free(symbols);
139 symbols = NULL;
140 if (abfd != NULL)
141 bfd_close(abfd);
142}
143
144static const char *lookup_name(bfd_vma addr)
145{
146 asymbol **sptr = symbols;
147 int i;
148
149 for (i = 0; i < symcount; i++) {
150 asymbol *sym = *sptr++;
151
152 if (addr == sym->value + sym->section->vma)
153 return sym->name;
154 }
155
156 return NULL;
157}
158
159/* Like target_read_memory, but slightly different parameters. */
160static int
161dis_asm_read_memory(bfd_vma memaddr, bfd_byte *myaddr, unsigned int len,
162 struct disassemble_info *info)
163{
164 memcpy(myaddr, (void *)memaddr, len);
165 return 0;
166}
167
168static void
169dis_asm_memory_error(int status, bfd_vma memaddr,
170 struct disassemble_info *info)
171{
172 fprintf(stderr, "memory_error %p\n", (void *)(long)memaddr);
173}
174
175static void
176dis_asm_print_address(bfd_vma addr, struct disassemble_info *info)
177{
178 const char *name;
179
180 printf("%08x", (int)addr);
181
182 name = lookup_name(addr);
183 if (name != NULL)
184 printf(" <%s>", name);
185}
186
187static int insn_printf(void *f, const char *format, ...)
188{
189 va_list args;
190 size_t n;
191
192 va_start(args, format);
193 n = vprintf(format, args);
194 va_end(args);
195
196 return n;
197}
198
199static int print_insn_hex(bfd_vma addr, struct disassemble_info *info)
200{
201 unsigned op;
202
203 dis_asm_read_memory(addr, (bfd_byte *)&op, 4, info);
204 printf("%p %08lx",(void *)addr, (long)op);
205 return 4;
206}
207
208#ifdef BFD_COMPRESS_ZSTD
209static int insn_printf_styled(void *f, enum disassembler_style style, const char* format, ...)
210{
211 va_list args;
212 size_t n;
213
214 va_start(args, format);
215 n = vprintf(format, args);
216 va_end(args);
217
218 return n;
219}
220#endif
221
222static void host_dasm_init(void)
223{
224 bfd_init();
225 if (g_argv && g_argv[0])
226 slurp_symtab(g_argv[0]);
227
228#ifdef BFD_COMPRESS_ZSTD
229 init_disassemble_info(&di, NULL, insn_printf, insn_printf_styled);
230#else
231 init_disassemble_info(&di, NULL, insn_printf);
232#endif
233 di.flavour = bfd_target_unknown_flavour;
234 di.memory_error_func = dis_asm_memory_error;
235 di.print_address_func = dis_asm_print_address;
236// di.symbol_at_address_func = dis_asm_symbol_at_address;
237 di.read_memory_func = dis_asm_read_memory;
238 di.arch = BFD_ARCH;
239 di.mach = BFD_MACH;
240 di.endian = BFD_ENDIAN_LITTLE;
241 di.disassembler_options = DASM_OPTS;
242 disassemble_init_for_target(&di);
243#ifndef print_insn_func
244 print_insn_func = disassembler(BFD_ARCH, 0, BFD_MACH, NULL);
245 if (!print_insn_func) print_insn_func = print_insn_hex;
246#endif
247 init_done = 1;
248}
249
250void host_dasm(void *addr, int len)
251{
252 bfd_vma vma_end, vma = (bfd_vma)addr;
253 const char *name;
254
255 if (!init_done)
256 host_dasm_init();
257
258 vma_end = vma + len;
259 while (vma < vma_end) {
260 name = lookup_name(vma);
261 if (name != NULL)
262 printf("%s:\n", name);
263
264 printf(" %08lx ", (long)vma);
265 vma += print_insn_func(vma, &di);
266 printf("\n");
267 }
268}
269
270void host_dasm_new_symbol_(void *addr, const char *name)
271{
272 bfd_vma vma = (bfd_vma)(long)addr;
273 asymbol *sym, **tmp;
274
275 if (!init_done)
276 host_dasm_init();
277 if (symbols == NULL)
278 return;
279 if (symstorage <= symcount * sizeof(symbols[0])) {
280 tmp = realloc(symbols, symstorage * 2);
281 if (tmp == NULL)
282 return;
283 symstorage *= 2;
284 symbols = tmp;
285 }
286
287 symbols[symcount] = calloc(sizeof(*symbols[0]), 1);
288 if (symbols[symcount] == NULL)
289 return;
290
291 // a HACK (should use correct section), but ohwell
292 sym = symbols[symcount];
293 sym->section = symbols[0]->section;
294 sym->value = vma - sym->section->vma;
295 sym->name = name;
296 symcount++;
297}
298