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macos: support bounds checking

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* non-process-shared POSIX semaphores aren't supported on
  Darwin, we use the dispatch framework
* dlsym segfaults with RTLD_NEXT from JIT code, so we must not
  even try this for -run.  So we need to know in __bound_init
  if called from -run code, or from normal code, which means passing
  this down also from __bt_init and hence from the stub added in
  tcc_add_btstub
* Darwin uses different structures for <ctype.h> facilities, this
  merely adds a warning about this
* __libc_freeres doesn't exist
* for non -run modus the context (.prog_base member) is constructed
  incorrectly (uses symbol zero for trying to get at the load bias,
  which doesn't really work that way), on Mach-O this errors out
  (and could also error out on ELF).  For now deactivate this, which
  makes backtraces not be symbolic on MacOS for not -run.
This commit is contained in:
Michael Matz
2020-05-22 05:06:08 +02:00
parent 0b3c8360a0
commit 57ba50e611
5 changed files with 36 additions and 17 deletions
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8
lib/bt-exe.c
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@@ -12,12 +12,12 @@ int (*__rt_error)(void*, void*, const char *, va_list);
#endif
__declspec(dllexport)
void __bt_init(rt_context *p, int num_callers)
void __bt_init(rt_context *p, int num_callers, int mode)
{
__attribute__((weak)) int main();
__attribute__((weak)) void __bound_init(void*);
__attribute__((weak)) void __bound_init(void*, int);
struct rt_context *rc = &g_rtctxt;
//fprintf(stderr, "__bt_init %d %p %p\n", num_callers, p->stab_sym, p->bounds_start), fflush(stderr);
//fprintf(stderr, "__bt_init %d %p %p %d\n", num_callers, p->stab_sym, p->bounds_start, mode), fflush(stderr);
if (num_callers) {
memcpy(rc, p, offsetof(rt_context, next));
rc->num_callers = num_callers - 1;
@@ -28,7 +28,7 @@ void __bt_init(rt_context *p, int num_callers)
p->next = rc->next, rc->next = p;
}
if (__bound_init && p->bounds_start)
__bound_init(p->bounds_start);
__bound_init(p->bounds_start, mode);
}
/* copy a string and truncate it. */