diff options
Diffstat (limited to 'shim.c')
| -rw-r--r-- | shim.c | 49 |
1 files changed, 47 insertions, 2 deletions
@@ -2136,8 +2136,48 @@ shim_fini(void) setup_console(0); } -EFI_STATUS efi_main (EFI_HANDLE passed_image_handle, - EFI_SYSTEM_TABLE *passed_systab) +extern EFI_STATUS +efi_main(EFI_HANDLE passed_image_handle, EFI_SYSTEM_TABLE *passed_systab); + +static void +__attribute__((__optimize__("0"))) +debug_hook(void) +{ + EFI_GUID guid = SHIM_LOCK_GUID; + UINT8 *data = NULL; + UINTN dataSize = 0; + EFI_STATUS efi_status; + volatile register int x = 0; + extern char _text, _data; + + if (x) + return; + + efi_status = get_variable(L"SHIM_DEBUG", &data, &dataSize, guid); + if (EFI_ERROR(efi_status)) { + return; + } + + Print(L"add-symbol-file /usr/lib/debug/usr/share/shim/" + EFI_ARCH"/shim.debug 0x%08x -s .data 0x%08x\n", &_text, + &_data); + + Print(L"Pausing for debugger attachment.\n"); + x = 1; + while (x) { +#if defined(__x86_64__) || defined(__i386__) || defined(__i686__) + __asm__ __volatile__("pause"); +#elif defined(__aarch64__) + __asm__ __volatile__("wfi"); +#else + uefi_call_wrapper(BS->Stall, 1, 50000); +#endif + } + x = 1; +} + +EFI_STATUS +efi_main (EFI_HANDLE passed_image_handle, EFI_SYSTEM_TABLE *passed_systab) { EFI_STATUS efi_status; @@ -2165,6 +2205,11 @@ EFI_STATUS efi_main (EFI_HANDLE passed_image_handle, InitializeLib(image_handle, systab); /* + * if SHIM_DEBUG is set, wait for a debugger to attach. + */ + debug_hook(); + + /* * Check whether the user has configured the system to run in * insecure mode */ |