2 * TCC - Tiny C Compiler - Support for -run switch
4 * Copyright (c) 2001-2004 Fabrice Bellard
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #define ucontext_t CONTEXT
27 static void set_pages_executable(void *ptr
, unsigned long length
);
28 static void set_exception_handler(void);
29 static int rt_get_caller_pc(uplong
*paddr
, ucontext_t
*uc
, int level
);
30 static void rt_error(ucontext_t
*uc
, const char *fmt
, ...);
31 static int tcc_relocate_ex(TCCState
*s1
, void *ptr
);
34 static void win64_add_function_table(TCCState
*s1
);
37 /* ------------------------------------------------------------- */
38 /* Do all relocations (needed before using tcc_get_symbol())
39 Returns -1 on error. */
41 int tcc_relocate(TCCState
*s1
)
45 /* Use mmap instead of malloc for Selinux
46 Ref http://www.gnu.org/s/libc/manual/html_node/File-Size.html */
47 char tmpfname
[] = "/tmp/.tccrunXXXXXX";
48 int fd
= mkstemp (tmpfname
);
49 if ((ret
= tcc_relocate_ex(s1
,NULL
)) < 0)return -1;
51 unlink (tmpfname
); ftruncate (fd
, s1
->mem_size
);
52 s1
->write_mem
= mmap (NULL
, ret
, PROT_READ
|PROT_WRITE
,
54 if(s1
->write_mem
== MAP_FAILED
){
55 error("/tmp not writeable");
58 s1
->runtime_mem
= mmap (NULL
, ret
, PROT_READ
|PROT_EXEC
,
60 if(s1
->runtime_mem
== MAP_FAILED
){
61 error("/tmp not executable");
64 ret
= tcc_relocate_ex(s1
, s1
->write_mem
);
66 ret
= tcc_relocate_ex(s1
, NULL
);
68 s1
->runtime_mem
= tcc_malloc(ret
);
69 ret
= tcc_relocate_ex(s1
, s1
->runtime_mem
);
75 /* launch the compiled program with the given arguments */
76 int tcc_run(TCCState
*s1
, int argc
, char **argv
)
78 int (*prog_main
)(int, char **);
80 if (tcc_relocate(s1
) < 0)
83 prog_main
= tcc_get_symbol_err(s1
, "main");
85 #ifdef CONFIG_TCC_BACKTRACE
87 set_exception_handler();
90 #ifdef CONFIG_TCC_BCHECK
91 if (s1
->do_bounds_check
) {
92 void (*bound_init
)(void);
93 void (*bound_exit
)(void);
95 /* set error function */
96 rt_bound_error_msg
= tcc_get_symbol_err(s1
, "__bound_error_msg");
97 rt_prog_main
= prog_main
;
98 /* XXX: use .init section so that it also work in binary ? */
99 bound_init
= tcc_get_symbol_err(s1
, "__bound_init");
100 bound_exit
= tcc_get_symbol_err(s1
, "__bound_exit");
102 ret
= (*prog_main
)(argc
, argv
);
110 unsigned char *p
= tcc_get_symbol(s1
, "tinyc_no_getbp");
114 return (*prog_main
)(argc
, argv
);
118 /* relocate code. Return -1 on error, required size if ptr is NULL,
119 otherwise copy code into buffer passed by the caller */
120 static int tcc_relocate_ex(TCCState
*s1
, void *ptr
)
123 unsigned long offset
, length
;
127 if (0 == s1
->runtime_added
) {
128 s1
->runtime_added
= 1;
131 pe_output_file(s1
, NULL
);
134 relocate_common_syms();
135 tcc_add_linker_symbols(s1
);
136 build_got_entries(s1
);
142 offset
= 0, mem
= (uplong
)ptr
;
143 for(i
= 1; i
< s1
->nb_sections
; i
++) {
145 if (0 == (s
->sh_flags
& SHF_ALLOC
))
147 length
= s
->data_offset
;
148 s
->sh_addr
= mem
? (mem
+ offset
+ 15) & ~15 : 0;
149 offset
= (offset
+ length
+ 15) & ~15;
153 /* relocate symbols */
154 relocate_syms(s1
, 1);
158 #if (defined TCC_TARGET_X86_64 || defined TCC_TARGET_ARM) && !defined TCC_TARGET_PE
159 s1
->runtime_plt_and_got_offset
= 0;
160 s1
->runtime_plt_and_got
= (char *)(mem
+ offset
);
161 /* double the size of the buffer for got and plt entries
162 XXX: calculate exact size for them? */
169 /* relocate each section */
170 for(i
= 1; i
< s1
->nb_sections
; i
++) {
173 relocate_section(s1
, s
);
176 for(i
= 1; i
< s1
->nb_sections
; i
++) {
178 if (0 == (s
->sh_flags
& SHF_ALLOC
))
180 length
= s
->data_offset
;
181 // printf("%-12s %08x %04x\n", s->name, s->sh_addr, length);
182 ptr
= (void*)(uplong
)s
->sh_addr
;
183 if (NULL
== s
->data
|| s
->sh_type
== SHT_NOBITS
)
184 memset(ptr
, 0, length
);
186 memcpy(ptr
, s
->data
, length
);
187 /* mark executable sections as executable in memory */
188 if (s
->sh_flags
& SHF_EXECINSTR
)
189 set_pages_executable(ptr
, length
);
192 #if (defined TCC_TARGET_X86_64 || defined TCC_TARGET_ARM) && !defined TCC_TARGET_PE
193 set_pages_executable(s1
->runtime_plt_and_got
,
194 s1
->runtime_plt_and_got_offset
);
198 win64_add_function_table(s1
);
203 /* ------------------------------------------------------------- */
204 /* allow to run code in memory */
206 static void set_pages_executable(void *ptr
, unsigned long length
)
209 unsigned long old_protect
;
210 VirtualProtect(ptr
, length
, PAGE_EXECUTE_READWRITE
, &old_protect
);
212 unsigned long start
, end
;
213 start
= (uplong
)ptr
& ~(PAGESIZE
- 1);
214 end
= (uplong
)ptr
+ length
;
215 end
= (end
+ PAGESIZE
- 1) & ~(PAGESIZE
- 1);
216 mprotect((void *)start
, end
- start
, PROT_READ
| PROT_WRITE
| PROT_EXEC
);
220 /* ------------------------------------------------------------- */
221 #ifdef CONFIG_TCC_BACKTRACE
223 /* print the position in the source file of PC value 'pc' by reading
224 the stabs debug information */
225 static uplong
rt_printline(uplong wanted_pc
, const char *msg
)
227 Stab_Sym
*sym
, *sym_end
;
228 char func_name
[128], last_func_name
[128];
229 unsigned long func_addr
, last_pc
, pc
;
230 const char *incl_files
[INCLUDE_STACK_SIZE
];
231 int incl_index
, len
, last_line_num
, i
;
237 last_func_name
[0] = '\0';
238 last_pc
= 0xffffffff;
240 sym
= (Stab_Sym
*)stab_section
->data
+ 1;
241 sym_end
= (Stab_Sym
*)(stab_section
->data
+ stab_section
->data_offset
);
242 while (sym
< sym_end
) {
243 switch(sym
->n_type
) {
244 /* function start or end */
246 if (sym
->n_strx
== 0) {
247 /* we test if between last line and end of function */
248 pc
= sym
->n_value
+ func_addr
;
249 if (wanted_pc
>= last_pc
&& wanted_pc
< pc
)
254 str
= stabstr_section
->data
+ sym
->n_strx
;
255 p
= strchr(str
, ':');
257 pstrcpy(func_name
, sizeof(func_name
), str
);
260 if (len
> sizeof(func_name
) - 1)
261 len
= sizeof(func_name
) - 1;
262 memcpy(func_name
, str
, len
);
263 func_name
[len
] = '\0';
265 func_addr
= sym
->n_value
;
268 /* line number info */
270 pc
= sym
->n_value
+ func_addr
;
271 if (wanted_pc
>= last_pc
&& wanted_pc
< pc
)
274 last_line_num
= sym
->n_desc
;
276 strcpy(last_func_name
, func_name
);
280 str
= stabstr_section
->data
+ sym
->n_strx
;
282 if (incl_index
< INCLUDE_STACK_SIZE
) {
283 incl_files
[incl_index
++] = str
;
291 if (sym
->n_strx
== 0) {
292 incl_index
= 0; /* end of translation unit */
294 str
= stabstr_section
->data
+ sym
->n_strx
;
295 /* do not add path */
297 if (len
> 0 && str
[len
- 1] != '/')
305 /* second pass: we try symtab symbols (no line number info) */
308 ElfW(Sym
) *sym
, *sym_end
;
311 sym_end
= (ElfW(Sym
) *)(symtab_section
->data
+ symtab_section
->data_offset
);
312 for(sym
= (ElfW(Sym
) *)symtab_section
->data
+ 1;
315 type
= ELFW(ST_TYPE
)(sym
->st_info
);
316 if (type
== STT_FUNC
|| type
== STT_GNU_IFUNC
) {
317 if (wanted_pc
>= sym
->st_value
&&
318 wanted_pc
< sym
->st_value
+ sym
->st_size
) {
319 pstrcpy(last_func_name
, sizeof(last_func_name
),
320 strtab_section
->data
+ sym
->st_name
);
321 func_addr
= sym
->st_value
;
327 /* did not find any info: */
328 fprintf(stderr
, "%s %p ???\n", msg
, (void*)wanted_pc
);
334 fprintf(stderr
, "%s:%d: ", incl_files
[--i
], last_line_num
);
335 fprintf(stderr
, "%s %p", msg
, (void*)wanted_pc
);
336 if (last_func_name
[0] != '\0')
337 fprintf(stderr
, " %s()", last_func_name
);
339 fprintf(stderr
, " (included from ");
341 fprintf(stderr
, "%s", incl_files
[i
]);
344 fprintf(stderr
, ", ");
346 fprintf(stderr
, ")");
348 fprintf(stderr
, "\n");
353 /* emit a run time error at position 'pc' */
354 static void rt_error(ucontext_t
*uc
, const char *fmt
, ...)
361 fprintf(stderr
, "Runtime error: ");
362 vfprintf(stderr
, fmt
, ap
);
363 fprintf(stderr
, "\n");
365 for(i
=0;i
<num_callers
;i
++) {
366 if (rt_get_caller_pc(&pc
, uc
, i
) < 0)
368 pc
= rt_printline(pc
, i
? "by" : "at");
369 if (pc
== (uplong
)rt_prog_main
&& pc
)
376 /* ------------------------------------------------------------- */
379 /* signal handler for fatal errors */
380 static void sig_error(int signum
, siginfo_t
*siginf
, void *puc
)
382 ucontext_t
*uc
= puc
;
386 switch(siginf
->si_code
) {
389 rt_error(uc
, "division by zero");
392 rt_error(uc
, "floating point exception");
398 if (rt_bound_error_msg
&& *rt_bound_error_msg
)
399 rt_error(uc
, *rt_bound_error_msg
);
401 rt_error(uc
, "dereferencing invalid pointer");
404 rt_error(uc
, "illegal instruction");
407 rt_error(uc
, "abort() called");
410 rt_error(uc
, "caught signal %d", signum
);
416 /* Generate a stack backtrace when a CPU exception occurs. */
417 static void set_exception_handler(void)
419 struct sigaction sigact
;
420 /* install TCC signal handlers to print debug info on fatal
422 sigact
.sa_flags
= SA_SIGINFO
| SA_RESETHAND
;
423 sigact
.sa_sigaction
= sig_error
;
424 sigemptyset(&sigact
.sa_mask
);
425 sigaction(SIGFPE
, &sigact
, NULL
);
426 sigaction(SIGILL
, &sigact
, NULL
);
427 sigaction(SIGSEGV
, &sigact
, NULL
);
428 sigaction(SIGBUS
, &sigact
, NULL
);
429 sigaction(SIGABRT
, &sigact
, NULL
);
432 /* ------------------------------------------------------------- */
435 /* fix for glibc 2.1 */
441 /* return the PC at frame level 'level'. Return non zero if not found */
442 static int rt_get_caller_pc(unsigned long *paddr
, ucontext_t
*uc
, int level
)
448 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
449 *paddr
= uc
->uc_mcontext
.mc_eip
;
450 #elif defined(__dietlibc__)
451 *paddr
= uc
->uc_mcontext
.eip
;
453 *paddr
= uc
->uc_mcontext
.gregs
[REG_EIP
];
457 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
458 fp
= uc
->uc_mcontext
.mc_ebp
;
459 #elif defined(__dietlibc__)
460 fp
= uc
->uc_mcontext
.ebp
;
462 fp
= uc
->uc_mcontext
.gregs
[REG_EBP
];
464 for(i
=1;i
<level
;i
++) {
465 /* XXX: check address validity with program info */
466 if (fp
<= 0x1000 || fp
>= 0xc0000000)
468 fp
= ((unsigned long *)fp
)[0];
470 *paddr
= ((unsigned long *)fp
)[1];
475 /* ------------------------------------------------------------- */
476 #elif defined(__x86_64__)
478 /* return the PC at frame level 'level'. Return non zero if not found */
479 static int rt_get_caller_pc(unsigned long *paddr
,
480 ucontext_t
*uc
, int level
)
486 /* XXX: only support linux */
487 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
488 *paddr
= uc
->uc_mcontext
.mc_rip
;
490 *paddr
= uc
->uc_mcontext
.gregs
[REG_RIP
];
494 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
495 fp
= uc
->uc_mcontext
.mc_rbp
;
497 fp
= uc
->uc_mcontext
.gregs
[REG_RBP
];
499 for(i
=1;i
<level
;i
++) {
500 /* XXX: check address validity with program info */
503 fp
= ((unsigned long *)fp
)[0];
505 *paddr
= ((unsigned long *)fp
)[1];
510 /* ------------------------------------------------------------- */
511 #elif defined(__arm__)
513 /* return the PC at frame level 'level'. Return negative if not found */
514 static int rt_get_caller_pc(unsigned long *paddr
,
515 ucontext_t
*uc
, int level
)
521 /* XXX: only supports linux */
522 #if defined(__linux__)
523 *paddr
= uc
->uc_mcontext
.arm_pc
;
529 #if defined(__linux__)
530 fp
= uc
->uc_mcontext
.arm_fp
;
531 sp
= uc
->uc_mcontext
.arm_sp
;
537 /* XXX: specific to tinycc stack frames */
538 if (fp
< sp
+ 12 || fp
& 3)
540 for(i
= 1; i
< level
; i
++) {
541 sp
= ((uint32_t *)fp
)[-2];
542 if (sp
< fp
|| sp
- fp
> 16 || sp
& 3)
544 fp
= ((uint32_t *)fp
)[-3];
545 if (fp
<= sp
|| fp
- sp
< 12 || fp
& 3)
548 /* XXX: check address validity with program info */
549 *paddr
= ((uint32_t *)fp
)[-1];
554 /* ------------------------------------------------------------- */
557 #warning add arch specific rt_get_caller_pc()
558 static int rt_get_caller_pc(unsigned long *paddr
,
559 ucontext_t
*uc
, int level
)
564 #endif /* !__i386__ */
566 /* ------------------------------------------------------------- */
569 static long __stdcall
cpu_exception_handler(EXCEPTION_POINTERS
*ex_info
)
571 CONTEXT
*uc
= ex_info
->ContextRecord
;
573 EXCEPTION_RECORD *er = ex_info->ExceptionRecord;
574 printf("CPU exception: code=%08lx addr=%p\n",
575 er->ExceptionCode, er->ExceptionAddress);
577 if (rt_bound_error_msg
&& *rt_bound_error_msg
)
578 rt_error(uc
, *rt_bound_error_msg
);
580 rt_error(uc
, "dereferencing invalid pointer");
582 //return EXCEPTION_CONTINUE_SEARCH;
585 /* Generate a stack backtrace when a CPU exception occurs. */
586 static void set_exception_handler(void)
588 SetUnhandledExceptionFilter(cpu_exception_handler
);
592 static void win64_add_function_table(TCCState
*s1
)
595 (RUNTIME_FUNCTION
*)(uplong
)s1
->uw_pdata
->sh_addr
,
596 s1
->uw_pdata
->data_offset
/ sizeof (RUNTIME_FUNCTION
),
597 (uplong
)text_section
->sh_addr
607 /* return the PC at frame level 'level'. Return non zero if not found */
608 static int rt_get_caller_pc(uplong
*paddr
, CONTEXT
*uc
, int level
)
618 for(i
=1;i
<level
;i
++) {
619 /* XXX: check address validity with program info */
620 if (fp
<= 0x1000 || fp
>= 0xc0000000)
622 fp
= ((uplong
*)fp
)[0];
624 *paddr
= ((uplong
*)fp
)[1];
633 #endif /* CONFIG_TCC_BACKTRACE */
634 /* ------------------------------------------------------------- */
636 #ifdef CONFIG_TCC_STATIC
638 #define RTLD_LAZY 0x001
639 #define RTLD_NOW 0x002
640 #define RTLD_GLOBAL 0x100
641 #define RTLD_DEFAULT NULL
643 /* dummy function for profiling */
644 void *dlopen(const char *filename
, int flag
)
649 void dlclose(void *p
)
653 const char *dlerror(void)
658 typedef struct TCCSyms
{
663 #define TCCSYM(a) { #a, &a, },
665 /* add the symbol you want here if no dynamic linking is done */
666 static TCCSyms tcc_syms
[] = {
667 #if !defined(CONFIG_TCCBOOT)
676 void *resolve_sym(TCCState
*s1
, const char *symbol
)
680 while (p
->str
!= NULL
) {
681 if (!strcmp(p
->str
, symbol
))
688 #elif !defined(_WIN32)
690 void *resolve_sym(TCCState
*s1
, const char *sym
)
692 return dlsym(RTLD_DEFAULT
, sym
);
695 #endif /* CONFIG_TCC_STATIC */
697 /* ------------------------------------------------------------- */