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kernel: quietly expose esp/ebp state on signal entry

This commit is contained in:
K. Lange 2018-10-17 19:17:03 +09:00
parent 90b102754f
commit bfbd3cfc13
1 changed files with 5 additions and 1 deletions
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6
kernel/sys/signal.c
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@ -12,8 +12,12 @@
void enter_signal_handler(uintptr_t location, int signum, uintptr_t stack) {
IRQ_OFF;
uintptr_t ebp = current_process->syscall_registers->ebp;
uintptr_t esp = current_process->syscall_registers->useresp;
asm volatile(
"mov %2, %%esp\n"
"pushl %4\n"
"pushl %3\n"
"pushl %1\n" /* argument count */
"pushl $" STRSTR(SIGNAL_RETURN) "\n"
"mov $0x23, %%ax\n" /* Segment selector */
@ -31,7 +35,7 @@ void enter_signal_handler(uintptr_t location, int signum, uintptr_t stack) {
"pushl $0x1B\n"
"pushl %0\n" /* Push the entry point */
"iret\n"
: : "m"(location), "m"(signum), "r"(stack) : "%ax", "%esp", "%eax");
: : "m"(location), "m"(signum), "r"(stack), "m"(ebp), "m"(esp) : "%ax", "%esp", "%eax");
debug_print(CRITICAL, "Failed to jump to signal handler!");
}