void
x86_initialize_commpage_signal_handler()
{
void* handlerCode = (void*)&x86_64_user_signal_handler;
void* handlerCodeEnd = &x86_64_user_signal_handler_end;
// Copy the signal handler code to the commpage.
size_t len = (size_t)((addr_t)handlerCodeEnd - (addr_t)handlerCode);
addr_t position = fill_commpage_entry(COMMPAGE_ENTRY_X86_SIGNAL_HANDLER,
handlerCode, len);
// Add symbol to the commpage image.
image_id image = get_commpage_image();
elf_add_memory_image_symbol(image, "commpage_signal_handler", position,
len, B_SYMBOL_TYPE_TEXT);
}
status_t
x86_initialize_commpage_syscall(void)
{
void* syscallCode = (void *)&_user_syscall_int;
void* syscallCodeEnd = &_user_syscall_int_end;
// check syscall
if (all_cpus_have_feature(FEATURE_COMMON, IA32_FEATURE_SEP)
&& !(gCPU[0].arch.family == 6 && gCPU[0].arch.model < 3
&& gCPU[0].arch.stepping < 3)) {
// Intel sysenter/sysexit
dprintf("initialize_commpage_syscall(): sysenter/sysexit supported\n");
// the code to be used in userland
syscallCode = (void *)&_user_syscall_sysenter;
syscallCodeEnd = &_user_syscall_sysenter_end;
// tell all CPUs to init their sysenter/sysexit related registers
call_all_cpus_sync(&init_intel_syscall_registers, NULL);
} else if (all_cpus_have_feature(FEATURE_EXT_AMD,
IA32_FEATURE_AMD_EXT_SYSCALL)) {
// AMD syscall/sysret
dprintf("initialize_commpage_syscall(): syscall/sysret supported "
"-- not yet by Antares, though");
} else {
// no special syscall support
dprintf("initialize_commpage_syscall(): no special syscall support\n");
}
// fill in the table entry
size_t len = (size_t)((addr_t)syscallCodeEnd - (addr_t)syscallCode);
fill_commpage_entry(COMMPAGE_ENTRY_X86_SYSCALL, syscallCode, len);
// add syscall to the commpage image
image_id image = get_commpage_image();
elf_add_memory_image_symbol(image, "commpage_syscall",
((addr_t*)USER_COMMPAGE_ADDR)[COMMPAGE_ENTRY_X86_SYSCALL], len,
B_SYMBOL_TYPE_TEXT);
return B_OK;
}
