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-rw-r--r--src/wrapper/wrapper.c112
1 files changed, 59 insertions, 53 deletions
diff --git a/src/wrapper/wrapper.c b/src/wrapper/wrapper.c
index 51d17a6..d78f1a4 100644
--- a/src/wrapper/wrapper.c
+++ b/src/wrapper/wrapper.c
@@ -11,9 +11,14 @@
#include "verbose.h"
#include <pthread.h>
+static __thread bool skip_trace;
+
void
verbose_log(const char *fmt, ...)
{
+ if (skip_trace)
+ return;
+
static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_lock(&mutex);
fprintf(stderr, "%lu: ", pthread_self());
@@ -26,56 +31,57 @@ verbose_log(const char *fmt, ...)
}
#ifdef VERBOSE_FUNCTIONS
-# ifdef ANDROID_X86_LINKER
+# ifdef ANDROID_X86_LINKER
__asm__(
- "wrapper_start: nop\n"
- "wrapper_symbol: pushl $0xFAFBFCFD\n"
- "wrapper_trace: movl $0xFAFBFCFD, %eax\ncall *%eax\npop %eax\n"
- "wrapper_call: movl $0xFAFBFCFD, %eax\njmp *%eax\n"
- "wrapper_end: nop\n"
+ "wrapper_start: nop\n"
+ "wrapper_symbol: pushl $0xFAFBFCFD\n"
+ "wrapper_trace: movl $0xFAFBFCFD, %eax\ncall *%eax\npop %eax\n"
+ "wrapper_call: movl $0xFAFBFCFD, %eax\njmp *%eax\n"
+ "wrapper_end: nop\n"
);
-# define WRAPPER_TRACE
-# else
-# warning "no wrapper asm for this platform, function tracing is not available"
-# endif
+# define WRAPPER_TRACE
+# else
+# warning "no wrapper asm for this platform, function tracing is not available"
+# endif
#endif
#ifdef WRAPPER_TRACE
extern char wrapper_start, wrapper_symbol, wrapper_trace, wrapper_call, wrapper_end;
static union {
- void *ptr;
- char* (*fun)(const char *mangled_name, char *output_buffer, size_t *length, int *status);
+ void *ptr;
+ char* (*fun)(const char *mangled_name, char *output_buffer, size_t *length, int *status);
} __cxa_demangle;
static void
trace(const char *const symbol)
{
- assert(symbol);
-
- if (__cxa_demangle.ptr) {
- // >If output_buffer is not long enough, it is expanded using realloc
- // Holy fuck gcc what the fuck? Guess we don't use stack then, thanks
- int status;
- char *demangled;
- static __thread char *data;
- static __thread size_t size;
- static __thread bool skip_trace;
-
- // Avoid infinite recursion and tracing calls made by __cxa_demangle.fun
- if (skip_trace)
- return;
-
- skip_trace = true;
- if ((demangled = __cxa_demangle.fun(symbol, data, &size, &status))) {
- data = (data != demangled ? demangled : data);
- verbose("trace: %s", demangled);
- return;
- }
- skip_trace = false;
- }
-
- verbose("trace: %s", symbol);
+ assert(symbol);
+
+ if (__cxa_demangle.ptr) {
+ // >If output_buffer is not long enough, it is expanded using realloc
+ // Holy fuck gcc what the fuck? Guess we don't use stack then, thanks
+ int status;
+ char *demangled;
+ static __thread char *data;
+ static __thread size_t size;
+
+ // Avoid infinite recursion and tracing calls made by __cxa_demangle.fun
+ if (skip_trace)
+ return;
+
+ skip_trace = true;
+ demangled = __cxa_demangle.fun(symbol, data, &size, &status);
+ skip_trace = false;
+
+ if (demangled) {
+ data = (data != demangled ? demangled : data);
+ verbose("trace: %s", demangled);
+ return;
+ }
+ }
+
+ verbose("trace: %s", symbol);
}
#endif
@@ -83,35 +89,35 @@ void
wrapper_set_cpp_demangler(void *function)
{
#ifdef WRAPPER_TRACE
- __cxa_demangle.ptr = function;
+ __cxa_demangle.ptr = function;
#endif
}
void*
wrapper_create(const char *const symbol, void *function)
{
- assert(symbol);
+ assert(symbol);
- if (!function) {
- verbose_log("FIXME: unimplemented symbol: %s", symbol);
- return NULL;
- }
+ if (!function) {
+ verbose_log("FIXME: unimplemented symbol: %s", symbol);
+ return NULL;
+ }
#ifdef WRAPPER_TRACE
- const size_t sz = &wrapper_end - &wrapper_start;
- unsigned char *fun = mmap(NULL, sz, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
- assert(fun != MAP_FAILED);
- memcpy(fun, &wrapper_start, sz);
+ const size_t sz = &wrapper_end - &wrapper_start;
+ unsigned char *fun = mmap(NULL, sz, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+ assert(fun != MAP_FAILED);
+ memcpy(fun, &wrapper_start, sz);
#ifdef ANDROID_X86_LINKER
- memcpy(fun + (&wrapper_symbol - &wrapper_start) + 1, &symbol, sizeof(symbol));
- memcpy(fun + (&wrapper_trace - &wrapper_start) + 1, (uintptr_t[]){ (uintptr_t)trace }, sizeof(uintptr_t));
- memcpy(fun + (&wrapper_call - &wrapper_start) + 1, &function, sizeof(function));
+ memcpy(fun + (&wrapper_symbol - &wrapper_start) + 1, &symbol, sizeof(symbol));
+ memcpy(fun + (&wrapper_trace - &wrapper_start) + 1, (uintptr_t[]){ (uintptr_t)trace }, sizeof(uintptr_t));
+ memcpy(fun + (&wrapper_call - &wrapper_start) + 1, &function, sizeof(function));
#else
# error "you forgot to implement the pointer setups for your asm platform"
#endif
- mprotect(fun, sz, PROT_READ | PROT_EXEC);
- return fun;
+ mprotect(fun, sz, PROT_READ | PROT_EXEC);
+ return fun;
#else
- return function;
+ return function;
#endif
}