diff options
| -rw-r--r-- | sys/arch/amd64/amd64/machdep.c | 46 | ||||
| -rw-r--r-- | sys/include/sys/ksyms.h | 44 | ||||
| -rw-r--r-- | sys/include/sys/panic.h | 1 | ||||
| -rw-r--r-- | sys/kern/kern_panic.c | 3 |
4 files changed, 94 insertions, 0 deletions
diff --git a/sys/arch/amd64/amd64/machdep.c b/sys/arch/amd64/amd64/machdep.c index c09ca0e..f74feb1 100644 --- a/sys/arch/amd64/amd64/machdep.c +++ b/sys/arch/amd64/amd64/machdep.c @@ -29,6 +29,8 @@ #include <sys/types.h> #include <sys/syslog.h> +#include <sys/ksyms.h> +#include <sys/panic.h> #include <machine/cpu.h> #include <machine/gdt.h> #include <machine/tss.h> @@ -108,6 +110,50 @@ try_mitigate_spectre(void) ibrs_enable(); } +static const char * +backtrace_addr_to_name(uintptr_t addr, off_t *off) +{ + uintptr_t prev_addr = 0; + const char *name = NULL; + + for (size_t i = 0;;) { + if (g_ksym_table[i].addr > addr) { + *off = addr - prev_addr; + return name; + } + + prev_addr = g_ksym_table[i].addr; + name = g_ksym_table[i].name; + if (g_ksym_table[i++].addr == (uint64_t)-1) + break; + } + + return NULL; +} + +void +backtrace(void) +{ + uintptr_t *rbp; + uintptr_t rip; + off_t off; + const char *name; + + __ASMV("mov %%rbp, %0" : "=r" (rbp) :: "memory"); + while (1) { + rip = rbp[1]; + rbp = (uintptr_t *)rbp[0]; + name = backtrace_addr_to_name(rip, &off); + + if (rbp == NULL) + break; + if (name == NULL) + name = "???"; + + kprintf(OMIT_TIMESTAMP "%p @ <%s+0x%x>\n", rip, name, off); + } +} + void cpu_halt_all(void) { diff --git a/sys/include/sys/ksyms.h b/sys/include/sys/ksyms.h new file mode 100644 index 0000000..2862cbc --- /dev/null +++ b/sys/include/sys/ksyms.h @@ -0,0 +1,44 @@ +/* + * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of Hyra nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef _SYS_KSYMS_H_ +#define _SYS_KSYMS_H_ + +#include <sys/cdefs.h> + +#if defined(_KERNEL) +struct kernel_symbol { + uint64_t addr; + char* name; +}; + +__weak extern struct kernel_symbol g_ksym_table[]; + +#endif /* defined(_KERNEL) */ +#endif diff --git a/sys/include/sys/panic.h b/sys/include/sys/panic.h index d3e6211..9db6a1e 100644 --- a/sys/include/sys/panic.h +++ b/sys/include/sys/panic.h @@ -33,6 +33,7 @@ #if defined(_KERNEL) void panic(const char *fmt, ...); +void backtrace(void); #endif /* _KERNEL */ #endif /* !_SYS_PANIC_H_ */ diff --git a/sys/kern/kern_panic.c b/sys/kern/kern_panic.c index 0a17456..af154a8 100644 --- a/sys/kern/kern_panic.c +++ b/sys/kern/kern_panic.c @@ -53,6 +53,9 @@ panic(const char *fmt, ...) kprintf(OMIT_TIMESTAMP "panic: "); vkprintf(fmt, &ap); + kprintf(OMIT_TIMESTAMP "** backtrace\n"); + backtrace(); + cpu_reboot(REBOOT_HALT); __builtin_unreachable(); } |