xnu-4903.241.1.tar.gz

[apple/xnu.git] / pexpert / i386 / pe_init.c

diff --git a/pexpert/i386/pe_init.c b/pexpert/i386/pe_init.c
index 35d44a25c20c746a37937392a1a6f34a5c731452..49f9caecf02be7c05c8fb58e592bdefd24cb9173 100644 (file)
--- a/pexpert/i386/pe_init.c
+++ b/pexpert/i386/pe_init.c
@@ -49,7 +49,7 @@
 
 /* extern references */
 extern void pe_identify_machine(void * args);
-
+extern int kdb_printf(const char *format, ...) __printflike(1,2);
 /* private globals */
 PE_state_t  PE_state;
 
@@ -189,14 +189,25 @@ void PE_init_platform(boolean_t vm_initialized, void * _args)
         // New EFI-style
         PE_state.bootArgs           = _args;
         PE_state.deviceTreeHead            = (void *) ml_static_ptovirt(args->deviceTreeP);
-        PE_state.video.v_baseAddr   = args->Video.v_baseAddr; // remains physical address
-        PE_state.video.v_rowBytes   = args->Video.v_rowBytes;
-        PE_state.video.v_width     = args->Video.v_width;
-        PE_state.video.v_height            = args->Video.v_height;
-        PE_state.video.v_depth     = args->Video.v_depth;
-        PE_state.video.v_display    = args->Video.v_display;
-        strlcpy(PE_state.video.v_pixelFormat, "PPPPPPPP",
-               sizeof(PE_state.video.v_pixelFormat));
+        if (args->Video.v_baseAddr) {
+            PE_state.video.v_baseAddr   = args->Video.v_baseAddr; // remains physical address
+            PE_state.video.v_rowBytes   = args->Video.v_rowBytes;
+            PE_state.video.v_width         = args->Video.v_width;
+            PE_state.video.v_height        = args->Video.v_height;
+            PE_state.video.v_depth         = args->Video.v_depth;
+            PE_state.video.v_display    = args->Video.v_display;
+            strlcpy(PE_state.video.v_pixelFormat, "PPPPPPPP",
+                sizeof(PE_state.video.v_pixelFormat));
+        } else {
+            PE_state.video.v_baseAddr   = args->VideoV1.v_baseAddr; // remains physical address
+            PE_state.video.v_rowBytes   = args->VideoV1.v_rowBytes;
+            PE_state.video.v_width         = args->VideoV1.v_width;
+            PE_state.video.v_height        = args->VideoV1.v_height;
+            PE_state.video.v_depth         = args->VideoV1.v_depth;
+            PE_state.video.v_display    = args->VideoV1.v_display;
+            strlcpy(PE_state.video.v_pixelFormat, "PPPPPPPP",
+                    sizeof(PE_state.video.v_pixelFormat));
+        }
 
 #ifdef  kBootArgsFlagHiDPI
        if (args->flags & kBootArgsFlagHiDPI)
@@ -215,7 +226,6 @@ void PE_init_platform(boolean_t vm_initialized, void * _args)
         }
 
         pe_identify_machine(args);
-    } else {
         pe_init_debug();
     }
 
@@ -325,13 +335,23 @@ PE_reboot_on_panic(void)
                return FALSE;
 }
 
+void
+PE_sync_panic_buffers(void)
+{
+}
+
 /* rdar://problem/21244753 */
 uint32_t
 PE_i_can_has_debugger(uint32_t *debug_flags)
 {
+#if DEVELOPMENT || DEBUG
+       if (debug_flags) {
+               assert(debug_boot_arg_inited);
+       }
+#endif
+
 #if CONFIG_CSR
-       if (csr_check(CSR_ALLOW_KERNEL_DEBUGGER) != 0 &&
-           csr_check(CSR_ALLOW_APPLE_INTERNAL) != 0) {
+       if (csr_check(CSR_ALLOW_KERNEL_DEBUGGER) != 0) {
                if (debug_flags)
                        *debug_flags = 0;
                return FALSE;
@@ -342,3 +362,70 @@ PE_i_can_has_debugger(uint32_t *debug_flags)
        }
        return TRUE;
 }
+
+uint32_t
+PE_get_offset_into_panic_region(char *location)
+{
+       assert(panic_info != NULL);
+       assert(location > (char *) panic_info);
+
+       return (uint32_t) (location - (char *) panic_info);
+}
+
+void
+PE_init_panicheader()
+{
+       bzero(panic_info, offsetof(struct macos_panic_header, mph_data));
+       panic_info->mph_panic_log_offset = PE_get_offset_into_panic_region(debug_buf_base);
+
+       panic_info->mph_magic = MACOS_PANIC_MAGIC;
+       panic_info->mph_version = MACOS_PANIC_HEADER_CURRENT_VERSION;
+
+       return;
+}
+
+/*
+ * Tries to update the panic header to keep it consistent on nested panics.
+ *
+ * NOTE: The purpose of this function is NOT to detect/correct corruption in the panic region,
+ *       it is to update the panic header to make it consistent when we nest panics.
+ *
+ * We try to avoid nested panics/asserts on x86 because they are difficult to debug, so log any
+ * inconsistencies we find.
+ */
+void
+PE_update_panicheader_nestedpanic()
+{
+       /* If the panic log offset is not set, re-init the panic header */
+       if (panic_info->mph_panic_log_offset == 0) {
+               PE_init_panicheader();
+               panic_info->mph_panic_flags |= MACOS_PANIC_HEADER_FLAG_NESTED_PANIC;
+               return;
+       }
+
+       panic_info->mph_panic_flags |= MACOS_PANIC_HEADER_FLAG_NESTED_PANIC;
+
+       /* Usually indicative of corruption in the panic region */
+       if(!(((panic_info->mph_stackshot_offset == 0) && (panic_info->mph_stackshot_len == 0)) ||
+                       ((panic_info->mph_stackshot_offset != 0) && (panic_info->mph_stackshot_len != 0)))) {
+               kdb_printf("panic_info contains invalid stackshot metadata: mph_stackshot_offset 0x%x mph_stackshot_len 0x%x\n",
+                               panic_info->mph_stackshot_offset, panic_info->mph_stackshot_len);
+       }
+
+       /*
+        * macOS panic logs contain nested panic data, if we've already closed the panic log,
+        * begin the other log.
+        */
+       if ((panic_info->mph_panic_log_len != 0) && (panic_info->mph_other_log_offset == 0)) {
+               panic_info->mph_other_log_offset = PE_get_offset_into_panic_region(debug_buf_ptr);
+
+               /* Usually indicative of corruption in the panic region */
+               if (panic_info->mph_other_log_len != 0) {
+                       kdb_printf("panic_info contains invalid other log metadata (zero offset but non-zero length), length was 0x%x, zeroing value\n",
+                                       panic_info->mph_other_log_len);
+                       panic_info->mph_other_log_len = 0;
+               }
+       }
+
+       return;
+}