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https://github.com/frida/tinycc
synced 2024-12-22 05:02:33 +03:00
ef42295fe8
This makes it possible to get backtraces with executables
(including DLLs/SOs) like we had it already with -g -run.
Option -b includes -bt, and -bt includes -g.
- new file lib/bt-exe.c: used to link rt_printline and the
exception handler from tccrun.c into executables/DLLs.
- new file lib/bt-log.c: provides a function that may be
called from user code to print out a backtrace with a
message (currently for i386/x86_64 only):
int (*tcc_backtrace)(const char *fmt, ...);
As an extra hack, if 'fmt' is prefixed like "^file.c^..."
then the backtrace will skip calls from within 'file.c'.
- new file lib/bt-dll.c: used on win32 to link the backtrace
and bcheck functions with the main module at runtime
- bcheck.c: now uses the tcc_backtrace function from above
- tccgen.c: minor cleanups
- tccelf.c: stab sections get SHF_ALLOC for easy access.
Also in relocate_section(): 64bit relocations for stabs
in DLLs cannot work. To find DLL addresses, the DLL base
is added manually in tccrun.c via rc.prog_base instead.
- tccpe.c: there are some changes to allow merging sections,
used to merge .finit_array into .data in the first place.
- tccpp.c: tcc -run now #defines __TCC_RUN__
also: refactor a line in tal_realloc that was incompatible
with bcheck
- tcctest.c: fixed a problem with r12 which tcc cannot preserve
as well as gcc does.
- tests2/112_backtrace.c: test the feature and the bcheck test18
that previously was in boundtest.c
68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
/* ------------------------------------------------------------- */
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/* stubs for calling bcheck functions from a dll. */
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#include <windows.h>
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#include <stdio.h>
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#define REDIR_ALL \
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REDIR(__bt_init) \
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REDIR(tcc_backtrace) \
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\
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REDIR(__bound_ptr_add) \
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REDIR(__bound_ptr_indir1) \
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REDIR(__bound_ptr_indir2) \
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REDIR(__bound_ptr_indir4) \
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REDIR(__bound_ptr_indir8) \
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REDIR(__bound_ptr_indir12) \
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REDIR(__bound_ptr_indir16) \
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REDIR(__bound_local_new) \
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REDIR(__bound_local_delete) \
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REDIR(__bound_new_region) \
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\
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REDIR(__bound_free) \
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REDIR(__bound_malloc) \
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REDIR(__bound_realloc) \
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REDIR(__bound_memcpy) \
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REDIR(__bound_memcmp) \
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REDIR(__bound_memmove) \
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REDIR(__bound_memset) \
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REDIR(__bound_strlen) \
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REDIR(__bound_strcpy) \
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REDIR(__bound_strncpy) \
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REDIR(__bound_strcmp) \
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REDIR(__bound_strncmp) \
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REDIR(__bound_strcat) \
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REDIR(__bound_strchr) \
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REDIR(__bound_strdup)
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#define REDIR(s) void *s;
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static struct { REDIR_ALL } all_ptrs;
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#undef REDIR
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#define REDIR(s) #s"\0"
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static const char all_names[] = REDIR_ALL;
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#undef REDIR
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#define REDIR(s) __asm__(".global "#s";"#s": jmp *%0" : : "m" (all_ptrs.s) );
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static void all_jmps() { REDIR_ALL }
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#undef REDIR
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void __bt_init_dll(int bcheck)
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{
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const char *s = all_names;
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void **p = (void**)&all_ptrs;
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do {
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*p = (void*)GetProcAddress(GetModuleHandle(NULL), (char*)s);
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if (NULL == *p) {
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char buf[100];
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sprintf(buf,
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"Error: function '%s()' not found in executable. "
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"(Need -bt or -b for linking the exe.)", s);
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if (GetStdHandle(STD_ERROR_HANDLE))
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fprintf(stderr, "TCC/BCHECK: %s\n", buf), fflush(stderr);
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else
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MessageBox(NULL, buf, "TCC/BCHECK", MB_ICONERROR);
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ExitProcess(1);
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}
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s = strchr(s,'\0') + 1, ++p;
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} while (*s && (bcheck || p < &all_ptrs.__bound_ptr_add));
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}
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