X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/b0d623f7f2ae71ed96e60569f61f9a9a27016e80..eb6b6ca394357805f2bdba989abae309f718b4d8:/pexpert/i386/pe_kprintf.c diff --git a/pexpert/i386/pe_kprintf.c b/pexpert/i386/pe_kprintf.c index b25bbcf28..ce2ff230e 100644 --- a/pexpert/i386/pe_kprintf.c +++ b/pexpert/i386/pe_kprintf.c @@ -1,8 +1,8 @@ /* - * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2019 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ - * + * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in @@ -11,10 +11,10 @@ * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. - * + * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. - * + * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, @@ -22,7 +22,7 @@ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. - * + * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* @@ -34,44 +34,61 @@ #include #include #include +#include #include +#include +#include +#include +#include +#include +#include +#include + +extern uint64_t LockTimeOut; +extern processor_t current_processor(void); /* Globals */ void (*PE_kputc)(char c); -#if DEBUG +#if DEVELOPMENT || DEBUG /* DEBUG kernel starts with true serial, but * may later disable or switch to video * console */ -unsigned int disable_serial_output = FALSE; +SECURITY_READ_ONLY_LATE(unsigned int) disable_serial_output = FALSE; #else -unsigned int disable_serial_output = TRUE; +SECURITY_READ_ONLY_LATE(unsigned int) disable_serial_output = TRUE; #endif -decl_simple_lock_data(static, kprintf_lock) +decl_simple_lock_data(static, kprintf_lock); -void PE_init_kprintf(boolean_t vm_initialized) +void +PE_init_kprintf(boolean_t vm_initialized) { - unsigned int boot_arg; + unsigned int boot_arg; - if (PE_state.initialized == FALSE) + if (PE_state.initialized == FALSE) { panic("Platform Expert not initialized"); + } if (!vm_initialized) { unsigned int new_disable_serial_output = TRUE; simple_lock_init(&kprintf_lock, 0); - if (PE_parse_boot_argn("debug", &boot_arg, sizeof (boot_arg))) - if (boot_arg & DB_KPRT) + if (PE_parse_boot_argn("debug", &boot_arg, sizeof(boot_arg))) { + if (boot_arg & DB_KPRT) { new_disable_serial_output = FALSE; + } + } - /* If we are newly enabling serial, make sure we only call serial_init() - * if our previous state was not enabled */ - if (!new_disable_serial_output && (!disable_serial_output || serial_init())) - PE_kputc = serial_putc; - else + /* If we are newly enabling serial, make sure we only + * call pal_serial_init() if our previous state was + * not enabled */ + if (!new_disable_serial_output && (!disable_serial_output || pal_serial_init())) { + PE_kputc = pal_serial_putc; + } else { PE_kputc = cnputc; + } disable_serial_output = new_disable_serial_output; } @@ -83,47 +100,69 @@ void PE_init_kprintf(boolean_t vm_initialized) #endif #ifdef MP_DEBUG -static void _kprintf(const char *format, ...) +static void +_kprintf(const char *format, ...) { va_list listp; - va_start(listp, format); - _doprnt(format, &listp, PE_kputc, 16); - va_end(listp); + va_start(listp, format); + _doprnt(format, &listp, PE_kputc, 16); + va_end(listp); } -#define MP_DEBUG_KPRINTF(x...) _kprintf(x) +#define MP_DEBUG_KPRINTF(x...) _kprintf(x) #else /* MP_DEBUG */ #define MP_DEBUG_KPRINTF(x...) #endif /* MP_DEBUG */ static int cpu_last_locked = 0; -void kprintf(const char *fmt, ...) + +#define KPRINTF_LOCKWAIT_PATIENT (LockTimeOut) +#define KPRINTF_LOCKWAIT_IMPATIENT (LockTimeOut >> 4) + +__attribute__((noinline, not_tail_called)) +void +kprintf(const char *fmt, ...) { - va_list listp; - boolean_t state; + va_list listp; + va_list listp2; + boolean_t state; + boolean_t in_panic_context = FALSE; + unsigned int kprintf_lock_grabbed; + void *caller = __builtin_return_address(0); if (!disable_serial_output) { - + boolean_t early = FALSE; + uint64_t gsbase = rdmsr64(MSR_IA32_GS_BASE); + if (gsbase == EARLY_GSBASE_MAGIC || gsbase == 0) { + early = TRUE; + } /* If PE_kputc has not yet been initialized, don't * take any locks, just dump to serial */ - if (!PE_kputc) { + if (!PE_kputc || early) { va_start(listp, fmt); - _doprnt(fmt, &listp, serial_putc, 16); + va_copy(listp2, listp); + + _doprnt_log(fmt, &listp, pal_serial_putc, 16); va_end(listp); + + // If interrupts are enabled + if (ml_get_interrupts_enabled()) { + os_log_with_args(OS_LOG_DEFAULT, OS_LOG_TYPE_DEFAULT, fmt, listp2, caller); + } + va_end(listp2); return; } - /* - * Spin to get kprintf lock but re-enable interrupts while - * failing. - * This allows interrupts to be handled while waiting but - * interrupts are disabled once we have the lock. - */ state = ml_set_interrupts_enabled(FALSE); - while (!simple_lock_try(&kprintf_lock)) { - ml_set_interrupts_enabled(state); - ml_set_interrupts_enabled(FALSE); - } + + pal_preemption_assert(); + + in_panic_context = processor_in_panic_context(current_processor()); + + // If current CPU is in panic context, be a little more impatient. + kprintf_lock_grabbed = simple_lock_try_lock_mp_signal_safe_loop_duration(&kprintf_lock, + in_panic_context ? KPRINTF_LOCKWAIT_IMPATIENT : KPRINTF_LOCKWAIT_PATIENT, + LCK_GRP_NULL); if (cpu_number() != cpu_last_locked) { MP_DEBUG_KPRINTF("[cpu%d...]\n", cpu_number()); @@ -131,14 +170,32 @@ void kprintf(const char *fmt, ...) } va_start(listp, fmt); + va_copy(listp2, listp); _doprnt(fmt, &listp, PE_kputc, 16); va_end(listp); - simple_unlock(&kprintf_lock); + if (kprintf_lock_grabbed) { + simple_unlock(&kprintf_lock); + } + ml_set_interrupts_enabled(state); + + // If interrupts are enabled + if (ml_get_interrupts_enabled()) { + os_log_with_args(OS_LOG_DEFAULT, OS_LOG_TYPE_DEFAULT, fmt, listp2, caller); + } + va_end(listp2); + } else { + if (ml_get_interrupts_enabled()) { + va_start(listp, fmt); + os_log_with_args(OS_LOG_DEFAULT, OS_LOG_TYPE_DEFAULT, fmt, listp, caller); + va_end(listp); + } } } + + extern void kprintf_break_lock(void); void kprintf_break_lock(void)