#include <stdio.h>
#include <stdlib.h>
+#include <stddef.h>
+/* TODO(bernhard): use {u,}int* types */
+
+#define __USE_GNU
// Note by hs: my signal.h includes sys/uconctext which conflicts with
// asm/ucontext - this hack kinda solves the problem for me ;-)
// so feel free to blame me for that s**t
#define __USE_XOPEN2K8
#endif
-#include <asm/ucontext.h>
-
-unsigned int getMethodEntry(unsigned int, void *, void *);
-
-void *method_map = NULL;
-void *caller_map = NULL;
-
-void set_mmap(void *mmap)
-{
- printf("set_mmap: 0x%08x\n", (unsigned int) mmap);
- method_map = mmap;
-}
-
-void *get_mmap()
-{
- printf("get_mmap: 0x%08x\n", (unsigned int) method_map);
- return method_map;
-}
-
-void set_cmap(void *cmap)
-{
- printf("set_cmap: 0x%08x\n", (unsigned int) cmap);
- caller_map = cmap;
-}
-
-void *get_cmap()
-{
- printf("get_cmap: 0x%08x\n", (unsigned int) caller_map);
- return caller_map;
-}
+#include <sys/ucontext.h>
+ptrdiff_t mateHandler(ptrdiff_t, ptrdiff_t, ptrdiff_t, ptrdiff_t);
-void mainresult(unsigned int a)
-{
- printf("mainresult: 0x%08x\n", a);
-}
+#ifdef DBG_TRAP
+#define dprintf(args...) do { printf (args); } while (0);
+#else
+#define dprintf(args...)
+#endif
-void callertrap(int nSignal, siginfo_t *info, void *ctx)
+void chandler(int nSignal, siginfo_t *info, void *ctx)
{
- struct ucontext *uctx = (struct ucontext *) ctx;
- unsigned int from = (unsigned int) uctx->uc_mcontext.eip - 2;
- unsigned int patchme = getMethodEntry(from, method_map, caller_map);
+ mcontext_t *mctx = &((ucontext_t *) ctx)->uc_mcontext;
+ greg_t *regs = mctx->gregs;
- printf("callertrap(mctx) by 0x%08x\n", from);
+ ptrdiff_t eip = (ptrdiff_t) regs[REG_EIP];
+ ptrdiff_t eax = (ptrdiff_t) regs[REG_EAX];
+ ptrdiff_t ebx = (ptrdiff_t) regs[REG_EBX];
+ ptrdiff_t esp = (ptrdiff_t) regs[REG_ESP];
+ ptrdiff_t esi = (ptrdiff_t) regs[REG_ESI];
+ ptrdiff_t ebp = (ptrdiff_t) regs[REG_EBP];
+ dprintf("trap: type %d, eip 0x%08x, eax 0x%08x, ebx 0x%08x, \n"
+ "esp 0x%08x, *esp 0x%08x, *(ebp+8) 0x%08x\n", nSignal, eip,
+ eax, ebx, esp, *(ptrdiff_t*) esp, *(ptrdiff_t *) (ebp + 8));
- unsigned int *to_patch = (unsigned int *) (from + 1);
- unsigned char *insn = (unsigned char *) from;
- *insn = 0xe8; // call opcode
- printf(" to_patch: 0x%08x\n", (unsigned int) to_patch);
- printf("*to_patch: 0x%08x\n", *to_patch);
- if (*to_patch != 0x90ffff90) {
- printf("something is wrong here. abort\n");
- exit(0);
+ ptrdiff_t ret = mateHandler(eip, eax, ebx, esi);
+ if (ret == -1) {
+ dprintf("regdump @ EIP: 0x%08x\n", regs[REG_EIP]);
+ dprintf("\tEAX: 0x%08lx EBX: 0x%08lx ECX: 0x%08lx EDX: 0x%08lx\n",
+ regs[REG_EAX], regs[REG_EBX], regs[REG_ECX], regs[REG_EDX]);
+ dprintf("\tESI: 0x%08lx EDI: 0x%08lx EBP: 0x%08lx ESP: 0x%08lx\n",
+ regs[REG_ESI], regs[REG_EDI], regs[REG_EBP], regs[REG_ESP]);
+ mctx->gregs[REG_EIP] = eip + 6;
+ } else {
+ mctx->gregs[REG_EIP] = ret;
}
- *to_patch = patchme - (from + 5);
- printf("*to_patch: 0x%08x\n", *to_patch);
- uctx->uc_mcontext.eip = (unsigned long) insn;
- // while (1) ;
}
void register_signal(void)
{
+ struct sigaction illaction;
+ illaction.sa_sigaction = chandler;
+ sigemptyset(&illaction.sa_mask);
+ illaction.sa_flags = SA_SIGINFO | SA_RESTART | SA_NODEFER;
+ sigaction(SIGILL, &illaction, NULL);
+
struct sigaction segvaction;
- segvaction.sa_sigaction = callertrap;
+ segvaction.sa_sigaction = chandler;
sigemptyset(&segvaction.sa_mask);
- segvaction.sa_flags = SA_SIGINFO | SA_RESTART;
- sigaction(SIGILL, &segvaction, NULL);
-}
-
-unsigned int getaddr(void)
-{
- return (unsigned int) mainresult;
+ segvaction.sa_flags = SA_SIGINFO | SA_RESTART | SA_NODEFER;
+ sigaction(SIGSEGV, &segvaction, NULL);
}