From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Tue, 9 Jul 2019 17:05:03 +0200
Subject: [PATCH] make better backtraces
Signed-off-by: Peter Jones <pjones@redhat.com>
---
Makefile.util.def | 6 ++
grub-core/Makefile.core.def | 16 ++--
grub-core/{lib => commands}/backtrace.c | 2 +-
grub-core/gdb/cstub.c | 1 -
grub-core/kern/arm64/backtrace.c | 94 ++++++++++++++++++++++++
grub-core/kern/backtrace.c | 97 +++++++++++++++++++++++++
grub-core/kern/dl.c | 45 ++++++++++++
grub-core/kern/i386/backtrace.c | 125 ++++++++++++++++++++++++++++++++
grub-core/kern/i386/pc/init.c | 4 +-
grub-core/kern/ieee1275/init.c | 1 -
grub-core/kern/misc.c | 13 ++--
grub-core/kern/mm.c | 6 +-
grub-core/lib/arm64/backtrace.c | 62 ----------------
grub-core/lib/i386/backtrace.c | 78 --------------------
include/grub/backtrace.h | 10 ++-
include/grub/dl.h | 2 +
include/grub/kernel.h | 3 +
grub-core/kern/arm/efi/startup.S | 2 +
grub-core/kern/arm/startup.S | 2 +
grub-core/kern/arm64/efi/startup.S | 2 +
grub-core/kern/i386/qemu/startup.S | 3 +-
grub-core/kern/ia64/efi/startup.S | 3 +-
grub-core/kern/sparc64/ieee1275/crt0.S | 3 +-
grub-core/Makefile.am | 1 +
24 files changed, 414 insertions(+), 167 deletions(-)
rename grub-core/{lib => commands}/backtrace.c (98%)
create mode 100644 grub-core/kern/arm64/backtrace.c
create mode 100644 grub-core/kern/backtrace.c
create mode 100644 grub-core/kern/i386/backtrace.c
delete mode 100644 grub-core/lib/arm64/backtrace.c
delete mode 100644 grub-core/lib/i386/backtrace.c
diff --git a/Makefile.util.def b/Makefile.util.def
index afc4d7b0c3..41906486a7 100644
--- a/Makefile.util.def
+++ b/Makefile.util.def
@@ -51,6 +51,12 @@ library = {
common = grub-core/partmap/msdos.c;
common = grub-core/fs/proc.c;
common = grub-core/fs/archelp.c;
+ common = grub-core/kern/backtrace.c;
+
+ x86 = grub-core/kern/i386/backtrace.c;
+ i386_xen = grub-core/kern/i386/backtrace.c;
+ x86_64_xen = grub-core/kern/i386/backtrace.c;
+ arm64 = grub-core/kern/arm64/backtrace.c;
};
library = {
diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
index 5354f9613d..4b7c45a7b0 100644
--- a/grub-core/Makefile.core.def
+++ b/grub-core/Makefile.core.def
@@ -142,6 +142,12 @@ kernel = {
common = kern/rescue_reader.c;
common = kern/term.c;
common = kern/verifiers.c;
+ common = kern/backtrace.c;
+
+ x86 = kern/i386/backtrace.c;
+ i386_xen = kern/i386/backtrace.c;
+ x86_64_xen = kern/i386/backtrace.c;
+ arm64 = kern/arm64/backtrace.c;
noemu = kern/compiler-rt.c;
noemu = kern/mm.c;
@@ -188,9 +194,6 @@ kernel = {
softdiv = lib/division.c;
- x86 = lib/i386/backtrace.c;
- x86 = lib/backtrace.c;
-
i386 = kern/i386/dl.c;
i386_xen = kern/i386/dl.c;
i386_xen_pvh = kern/i386/dl.c;
@@ -2398,15 +2401,12 @@ module = {
module = {
name = backtrace;
- x86 = lib/i386/backtrace.c;
- i386_xen_pvh = lib/i386/backtrace.c;
- i386_xen = lib/i386/backtrace.c;
- x86_64_xen = lib/i386/backtrace.c;
- common = lib/backtrace.c;
+ common = commands/backtrace.c;
enable = x86;
enable = i386_xen_pvh;
enable = i386_xen;
enable = x86_64_xen;
+ enable = arm64;
};
module = {
diff --git a/grub-core/lib/backtrace.c b/grub-core/commands/backtrace.c
similarity index 98%
rename from grub-core/lib/backtrace.c
rename to grub-core/commands/backtrace.c
index c0ad6ab8be..8b5ec3913b 100644
--- a/grub-core/lib/backtrace.c
+++ b/grub-core/commands/backtrace.c
@@ -54,7 +54,7 @@ grub_cmd_backtrace (grub_command_t cmd __attribute__ ((unused)),
int argc __attribute__ ((unused)),
char **args __attribute__ ((unused)))
{
- grub_backtrace ();
+ grub_backtrace (1);
return 0;
}
diff --git a/grub-core/gdb/cstub.c b/grub-core/gdb/cstub.c
index b64acd70fe..99281472d3 100644
--- a/grub-core/gdb/cstub.c
+++ b/grub-core/gdb/cstub.c
@@ -215,7 +215,6 @@ grub_gdb_trap (int trap_no)
grub_printf ("Unhandled exception 0x%x at ", trap_no);
grub_backtrace_print_address ((void *) grub_gdb_regs[PC]);
grub_printf ("\n");
- grub_backtrace_pointer ((void *) grub_gdb_regs[EBP]);
grub_fatal ("Unhandled exception");
}
diff --git a/grub-core/kern/arm64/backtrace.c b/grub-core/kern/arm64/backtrace.c
new file mode 100644
index 0000000000..019c6fdfef
--- /dev/null
+++ b/grub-core/kern/arm64/backtrace.c
@@ -0,0 +1,94 @@
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2009 Free Software Foundation, Inc.
+ *
+ * GRUB is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/misc.h>
+#include <grub/command.h>
+#include <grub/err.h>
+#include <grub/dl.h>
+#include <grub/mm.h>
+#include <grub/term.h>
+#include <grub/backtrace.h>
+
+#define MAX_STACK_FRAME 102400
+
+struct fplr
+{
+ void *lr;
+ struct fplr *fp;
+};
+
+void
+grub_backtrace_pointer (void *frame, unsigned int skip)
+{
+ unsigned int x = 0;
+ struct fplr *fplr = (struct fplr *)frame;
+
+ while (fplr)
+ {
+ const char *name = NULL;
+ char *addr = NULL;
+
+ grub_dprintf("backtrace", "fp is %p next_fp is %p\n",
+ fplr, fplr->fp);
+
+ if (x >= skip)
+ {
+ name = grub_get_symbol_by_addr (fplr->lr, 1);
+ if (name)
+ addr = grub_resolve_symbol (name);
+ grub_backtrace_print_address (fplr->lr);
+
+ if (addr && addr != fplr->lr)
+ grub_printf (" %s() %p+%p \n", name ? name : "unknown", addr,
+ (void *)((grub_uint64_t)fplr->lr - (grub_uint64_t)addr));
+ else
+ grub_printf(" %s() %p \n", name ? name : "unknown", addr);
+
+ }
+
+ x += 1;
+
+ if (fplr->fp < fplr ||
+ (grub_uint64_t)fplr->fp - (grub_uint64_t)fplr > MAX_STACK_FRAME ||
+ fplr->fp == fplr)
+ {
+ break;
+ }
+ fplr = fplr->fp;
+ }
+}
+
+asm ("\t.global \"_text\"\n"
+ "_text:\n"
+ "\t.quad .text\n"
+ "\t.global \"_data\"\n"
+ "_data:\n"
+ "\t.quad .data\n"
+ );
+
+extern grub_uint64_t _text;
+extern grub_uint64_t _data;
+
+void
+grub_backtrace_arch (unsigned int skip)
+{
+ grub_printf ("Backtrace (.text %p .data %p):\n",
+ (void *)_text, (void *)_data);
+ skip += 1;
+ grub_backtrace_pointer(__builtin_frame_address(0), skip);
+}
diff --git a/grub-core/kern/backtrace.c b/grub-core/kern/backtrace.c
new file mode 100644
index 0000000000..4a82e865cc
--- /dev/null
+++ b/grub-core/kern/backtrace.c
@@ -0,0 +1,97 @@
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2009 Free Software Foundation, Inc.
+ *
+ * GRUB is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/misc.h>
+#include <grub/command.h>
+#include <grub/err.h>
+#include <grub/dl.h>
+#include <grub/mm.h>
+#include <grub/term.h>
+#include <grub/backtrace.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+static void
+grub_backtrace_print_address_default (void *addr)
+{
+#ifndef GRUB_UTIL
+ grub_dl_t mod;
+ void *start_addr;
+
+ FOR_DL_MODULES (mod)
+ {
+ grub_dl_segment_t segment;
+ for (segment = mod->segment; segment; segment = segment->next)
+ if (segment->addr <= addr && (grub_uint8_t *) segment->addr
+ + segment->size > (grub_uint8_t *) addr)
+ {
+ grub_printf ("%s.%x+%" PRIxGRUB_SIZE, mod->name,
+ segment->section,
+ (grub_size_t)
+ ((grub_uint8_t *)addr - (grub_uint8_t *)segment->addr));
+ return;
+ }
+ }
+
+ start_addr = grub_resolve_symbol ("_start");
+ if (start_addr && start_addr < addr)
+ grub_printf ("kernel+%" PRIxGRUB_SIZE,
+ (grub_size_t)
+ ((grub_uint8_t *)addr - (grub_uint8_t *)start_addr));
+ else
+#endif
+ grub_printf ("%p", addr);
+}
+
+static void
+grub_backtrace_pointer_default (void *frame __attribute__((__unused__)),
+ unsigned int skip __attribute__((__unused__)))
+{
+ return;
+}
+
+void
+grub_backtrace_pointer (void *frame, unsigned int skip)
+ __attribute__((__weak__,
+ __alias__(("grub_backtrace_pointer_default"))));
+
+void
+grub_backtrace_print_address (void *addr)
+ __attribute__((__weak__,
+ __alias__(("grub_backtrace_print_address_default"))));
+
+static void
+grub_backtrace_arch_default(unsigned int skip)
+{
+ grub_backtrace_pointer(__builtin_frame_address(0), skip + 1);
+}
+
+void grub_backtrace_arch (unsigned int skip)
+ __attribute__((__weak__, __alias__(("grub_backtrace_arch_default"))));
+
+void grub_backtrace (unsigned int skip)
+{
+ grub_backtrace_arch(skip + 1);
+}
+
+void grub_debug_backtrace (const char * const debug,
+ unsigned int skip)
+{
+ if (grub_debug_enabled (debug))
+ grub_backtrace (skip + 1);
+}
diff --git a/grub-core/kern/dl.c b/grub-core/kern/dl.c
index 7afb9e6f72..88d2077709 100644
--- a/grub-core/kern/dl.c
+++ b/grub-core/kern/dl.c
@@ -124,6 +124,50 @@ grub_dl_resolve_symbol (const char *name)
return 0;
}
+void *
+grub_resolve_symbol (const char *name)
+{
+ grub_symbol_t sym;
+
+ sym = grub_dl_resolve_symbol (name);
+ if (sym)
+ return sym->addr;
+ return NULL;
+}
+
+const char *
+grub_get_symbol_by_addr(const void *addr, int isfunc)
+{
+ unsigned int i;
+ grub_symbol_t before = NULL, after = NULL;
+ for (i = 0; i < GRUB_SYMTAB_SIZE; i++)
+ {
+ grub_symbol_t sym;
+ for (sym = grub_symtab[i]; sym; sym = sym->next)
+ {
+ //grub_printf ("addr 0x%08llx symbol %s\n", (unsigned long long)sym->addr, sym->name);
+ if (sym->addr > addr)
+ {
+ if (!after || sym->addr > after->addr)
+ after = sym;
+ }
+
+ if (isfunc != sym->isfunc)
+ continue;
+ if (sym->addr > addr)
+ continue;
+
+ if ((!before && sym->addr <= addr) || (before && before->addr <= sym->addr))
+ before = sym;
+ }
+ }
+
+ if (before && addr < after->addr)
+ return before->name;
+
+ return NULL;
+}
+
/* Register a symbol with the name NAME and the address ADDR. */
grub_err_t
grub_dl_register_symbol (const char *name, void *addr, int isfunc,
@@ -336,6 +380,7 @@ grub_dl_resolve_symbols (grub_dl_t mod, Elf_Ehdr *e)
const char *str;
Elf_Word size, entsize;
+ grub_dprintf ("modules", "Resolving symbols for \"%s\"\n", mod->name);
for (i = 0, s = (Elf_Shdr *) ((char *) e + e->e_shoff);
i < e->e_shnum;
i++, s = (Elf_Shdr *) ((char *) s + e->e_shentsize))
diff --git a/grub-core/kern/i386/backtrace.c b/grub-core/kern/i386/backtrace.c
new file mode 100644
index 0000000000..2413f9a57d
--- /dev/null
+++ b/grub-core/kern/i386/backtrace.c
@@ -0,0 +1,125 @@
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2009 Free Software Foundation, Inc.
+ *
+ * GRUB is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/misc.h>
+#include <grub/command.h>
+#include <grub/err.h>
+#include <grub/dl.h>
+#include <grub/mm.h>
+#include <grub/term.h>
+#include <grub/backtrace.h>
+
+#define MAX_STACK_FRAME 102400
+
+void
+grub_backtrace_pointer (void *frame, unsigned int skip)
+{
+ void **ebp = (void **)frame;
+ unsigned long x = 0;
+
+ while (ebp)
+ {
+ void **next_ebp = (void **)ebp[0];
+ const char *name = NULL;
+ char *addr = NULL;
+
+ grub_dprintf("backtrace", "ebp is %p next_ebp is %p\n", ebp, next_ebp);
+
+ if (x >= skip)
+ {
+ name = grub_get_symbol_by_addr (ebp[1], 1);
+ if (name)
+ addr = grub_resolve_symbol (name);
+ grub_backtrace_print_address (ebp[1]);
+
+ if (addr && addr != ebp[1])
+ grub_printf (" %s() %p+%p \n", name ? name : "unknown", addr,
+ (char *)((char *)ebp[1] - addr));
+ else
+ grub_printf(" %s() %p \n", name ? name : "unknown", addr);
+
+#if 0
+ grub_printf ("(");
+ for (i = 0, arg = ebp[2]; arg != next_ebp && i < 12; arg++, i++)
+ grub_printf ("%p,", arg);
+ grub_printf (")\n");
+#endif
+ }
+
+ x += 1;
+
+ if (next_ebp < ebp || next_ebp - ebp > MAX_STACK_FRAME || next_ebp == ebp)
+ {
+ //grub_printf ("Invalid stack frame at %p (%p)\n", ebp, next_ebp);
+ break;
+ }
+ ebp = next_ebp;
+ }
+}
+
+#if defined (__x86_64__)
+asm ("\t.global \"_text\"\n"
+ "_text:\n"
+ "\t.quad .text\n"
+ "\t.global \"_data\"\n"
+ "_data:\n"
+ "\t.quad .data\n"
+ );
+#elif defined(__i386__)
+asm ("\t.global \"_text\"\n"
+ "_text:\n"
+ "\t.long .text\n"
+ "\t.global \"_data\"\n"
+ "_data:\n"
+ "\t.long .data\n"
+ );
+#else
+#warning I dunno...
+#endif
+
+extern unsigned long _text;
+extern unsigned long _data;
+
+#ifdef GRUB_UTIL
+#define EXT_C(x) x
+#endif
+
+void
+grub_backtrace_arch (unsigned int skip)
+{
+ grub_printf ("Backtrace (.text %p .data %p):\n",
+ (void *)_text, (void *)_data);
+ skip += 1;
+#if defined (__x86_64__)
+ asm volatile ("movq %%rbp, %%rdi\n"
+ "movq 0, %%rsi\n"
+ "movl %0, %%esi\n"
+ "call " EXT_C("grub_backtrace_pointer")
+ :
+ : "r" (skip));
+#elif defined(__i386__)
+ asm volatile ("addl $8, %%esp\n"
+ "pushl %0\n"
+ "pushl %%ebp\n"
+ "call " EXT_C("grub_backtrace_pointer")
+ :
+ : "r" (skip));
+#else
+ grub_backtrace_pointer(__builtin_frame_address(0), skip);
+#endif
+}
diff --git a/grub-core/kern/i386/pc/init.c b/grub-core/kern/i386/pc/init.c
index 27bc68b8a5..b51d0abfa6 100644
--- a/grub-core/kern/i386/pc/init.c
+++ b/grub-core/kern/i386/pc/init.c
@@ -153,7 +153,7 @@ compact_mem_regions (void)
}
grub_addr_t grub_modbase;
-extern grub_uint8_t _start[], _edata[];
+extern grub_uint8_t _edata[];
/* Helper for grub_machine_init. */
static int
@@ -217,7 +217,7 @@ grub_machine_init (void)
/* This has to happen before any BIOS calls. */
grub_via_workaround_init ();
- grub_modbase = GRUB_MEMORY_MACHINE_DECOMPRESSION_ADDR + (_edata - _start);
+ grub_modbase = GRUB_MEMORY_MACHINE_DECOMPRESSION_ADDR + (_edata - (grub_uint8_t *)_start);
/* Initialize the console as early as possible. */
grub_console_init ();
diff --git a/grub-core/kern/ieee1275/init.c b/grub-core/kern/ieee1275/init.c
index 0cd2a62723..937c1bc44c 100644
--- a/grub-core/kern/ieee1275/init.c
+++ b/grub-core/kern/ieee1275/init.c
@@ -63,7 +63,6 @@
#define HEAP_MAX_ADDR (unsigned long) (32 * 1024 * 1024)
#endif
-extern char _start[];
extern char _end[];
#ifdef __sparc__
diff --git a/grub-core/kern/misc.c b/grub-core/kern/misc.c
index c60601b699..a432a6be54 100644
--- a/grub-core/kern/misc.c
+++ b/grub-core/kern/misc.c
@@ -1197,15 +1197,15 @@ grub_printf_fmt_check (const char *fmt, const char *fmt_expected)
/* Abort GRUB. This function does not return. */
-static void __attribute__ ((noreturn))
+static inline void __attribute__ ((noreturn))
grub_abort (void)
{
-#ifndef GRUB_UTIL
-#if (defined(__i386__) || defined(__x86_64__)) && !defined(GRUB_MACHINE_EMU)
- grub_backtrace();
+#if !defined(GRUB_MACHINE_EMU) && !defined(GRUB_UTIL)
+ grub_backtrace (1);
+#else
+ grub_printf ("\n");
#endif
-#endif
- grub_printf ("\nAborted.");
+ grub_printf ("Aborted.");
#ifndef GRUB_UTIL
if (grub_term_inputs)
@@ -1232,6 +1232,7 @@ grub_fatal (const char *fmt, ...)
{
va_list ap;
+ grub_printf ("\n");
va_start (ap, fmt);
grub_vprintf (_(fmt), ap);
va_end (ap);
diff --git a/grub-core/kern/mm.c b/grub-core/kern/mm.c
index c070afc621..d8c8377578 100644
--- a/grub-core/kern/mm.c
+++ b/grub-core/kern/mm.c
@@ -97,13 +97,13 @@ get_header_from_pointer (void *ptr, grub_mm_header_t *p, grub_mm_region_t *r)
break;
if (! *r)
- grub_fatal ("out of range pointer %p", ptr);
+ grub_fatal ("out of range pointer %p\n", ptr);
*p = (grub_mm_header_t) ptr - 1;
if ((*p)->magic == GRUB_MM_FREE_MAGIC)
- grub_fatal ("double free at %p", *p);
+ grub_fatal ("double free at %p\n", *p);
if ((*p)->magic != GRUB_MM_ALLOC_MAGIC)
- grub_fatal ("alloc magic is broken at %p: %lx", *p,
+ grub_fatal ("alloc magic is broken at %p: %lx\n", *p,
(unsigned long) (*p)->magic);
}
diff --git a/grub-core/lib/arm64/backtrace.c b/grub-core/lib/arm64/backtrace.c
deleted file mode 100644
index 1079b5380e..0000000000
--- a/grub-core/lib/arm64/backtrace.c
+++ /dev/null
@@ -1,62 +0,0 @@
-/*
- * GRUB -- GRand Unified Bootloader
- * Copyright (C) 2009 Free Software Foundation, Inc.
- *
- * GRUB is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * GRUB is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#include <grub/misc.h>
-#include <grub/command.h>
-#include <grub/err.h>
-#include <grub/dl.h>
-#include <grub/mm.h>
-#include <grub/term.h>
-#include <grub/backtrace.h>
-
-#define MAX_STACK_FRAME 102400
-
-void
-grub_backtrace_pointer (int frame)
-{
- while (1)
- {
- void *lp = __builtin_return_address (frame);
- if (!lp)
- break;
-
- lp = __builtin_extract_return_addr (lp);
-
- grub_printf ("%p: ", lp);
- grub_backtrace_print_address (lp);
- grub_printf (" (");
- for (i = 0; i < 2; i++)
- grub_printf ("%p,", ((void **)ptr) [i + 2]);
- grub_printf ("%p)\n", ((void **)ptr) [i + 2]);
- nptr = *(void **)ptr;
- if (nptr < ptr || (void **) nptr - (void **) ptr > MAX_STACK_FRAME
- || nptr == ptr)
- {
- grub_printf ("Invalid stack frame at %p (%p)\n", ptr, nptr);
- break;
- }
- ptr = nptr;
- }
-}
-
-void
-grub_backtrace (void)
-{
- grub_backtrace_pointer (1);
-}
-
diff --git a/grub-core/lib/i386/backtrace.c b/grub-core/lib/i386/backtrace.c
deleted file mode 100644
index c67273db3a..0000000000
--- a/grub-core/lib/i386/backtrace.c
+++ /dev/null
@@ -1,78 +0,0 @@
-/*
- * GRUB -- GRand Unified Bootloader
- * Copyright (C) 2009 Free Software Foundation, Inc.
- *
- * GRUB is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * GRUB is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
- */
-#include <config.h>
-#ifdef GRUB_UTIL
-#define REALLY_GRUB_UTIL GRUB_UTIL
-#undef GRUB_UTIL
-#endif
-
-#include <grub/symbol.h>
-#include <grub/dl.h>
-
-#ifdef REALLY_GRUB_UTIL
-#define GRUB_UTIL REALLY_GRUB_UTIL
-#undef REALLY_GRUB_UTIL
-#endif
-
-#include <grub/misc.h>
-#include <grub/command.h>
-#include <grub/err.h>
-#include <grub/mm.h>
-#include <grub/term.h>
-#include <grub/backtrace.h>
-
-#define MAX_STACK_FRAME 102400
-
-void
-grub_backtrace_pointer (void *ebp)
-{
- void *ptr, *nptr;
- unsigned i;
-
- ptr = ebp;
- while (1)
- {
- grub_printf ("%p: ", ptr);
- grub_backtrace_print_address (((void **) ptr)[1]);
- grub_printf (" (");
- for (i = 0; i < 2; i++)
- grub_printf ("%p,", ((void **)ptr) [i + 2]);
- grub_printf ("%p)\n", ((void **)ptr) [i + 2]);
- nptr = *(void **)ptr;
- if (nptr < ptr || (void **) nptr - (void **) ptr > MAX_STACK_FRAME
- || nptr == ptr)
- {
- grub_printf ("Invalid stack frame at %p (%p)\n", ptr, nptr);
- break;
- }
- ptr = nptr;
- }
-}
-
-void
-grub_backtrace (void)
-{
-#ifdef __x86_64__
- asm volatile ("movq %%rbp, %%rdi\n"
- "callq *%%rax": :"a"(grub_backtrace_pointer));
-#else
- asm volatile ("movl %%ebp, %%eax\n"
- "calll *%%ecx": :"c"(grub_backtrace_pointer));
-#endif
-}
-
diff --git a/include/grub/backtrace.h b/include/grub/backtrace.h
index 395519762f..275cf85e2d 100644
--- a/include/grub/backtrace.h
+++ b/include/grub/backtrace.h
@@ -19,8 +19,14 @@
#ifndef GRUB_BACKTRACE_HEADER
#define GRUB_BACKTRACE_HEADER 1
-void grub_backtrace (void);
-void grub_backtrace_pointer (void *ptr);
+#include <grub/symbol.h>
+#include <grub/types.h>
+
+void EXPORT_FUNC(grub_debug_backtrace) (const char * const debug,
+ unsigned int skip);
+void EXPORT_FUNC(grub_backtrace) (unsigned int skip);
+void grub_backtrace_arch (unsigned int skip);
+void grub_backtrace_pointer (void *ptr, unsigned int skip);
void grub_backtrace_print_address (void *addr);
#endif
diff --git a/include/grub/dl.h b/include/grub/dl.h
index 91933b85f2..2f76e6b043 100644
--- a/include/grub/dl.h
+++ b/include/grub/dl.h
@@ -259,6 +259,8 @@ grub_dl_is_persistent (grub_dl_t mod)
#endif
+void * EXPORT_FUNC(grub_resolve_symbol) (const char *name);
+const char * EXPORT_FUNC(grub_get_symbol_by_addr) (const void *addr, int isfunc);
grub_err_t grub_dl_register_symbol (const char *name, void *addr,
int isfunc, grub_dl_t mod);
diff --git a/include/grub/kernel.h b/include/grub/kernel.h
index abbca5ea33..300a9766cd 100644
--- a/include/grub/kernel.h
+++ b/include/grub/kernel.h
@@ -111,6 +111,9 @@ grub_addr_t grub_modules_get_end (void);
#endif
+void EXPORT_FUNC(start) (void);
+void EXPORT_FUNC(_start) (void);
+
/* The start point of the C code. */
void grub_main (void) __attribute__ ((noreturn));
diff --git a/grub-core/kern/arm/efi/startup.S b/grub-core/kern/arm/efi/startup.S
index 9f8265315a..f3bc41f9d0 100644
--- a/grub-core/kern/arm/efi/startup.S
+++ b/grub-core/kern/arm/efi/startup.S
@@ -23,6 +23,8 @@
.file "startup.S"
.text
.arm
+ .globl start, _start
+FUNCTION(start)
FUNCTION(_start)
/*
* EFI_SYSTEM_TABLE and EFI_HANDLE are passed in r1/r0.
diff --git a/grub-core/kern/arm/startup.S b/grub-core/kern/arm/startup.S
index 3946fe8e18..5679a1d00a 100644
--- a/grub-core/kern/arm/startup.S
+++ b/grub-core/kern/arm/startup.S
@@ -48,6 +48,8 @@
.text
.arm
+ .globl start, _start
+FUNCTION(start)
FUNCTION(_start)
b codestart
diff --git a/grub-core/kern/arm64/efi/startup.S b/grub-core/kern/arm64/efi/startup.S
index 666a7ee3c9..41676bdb2b 100644
--- a/grub-core/kern/arm64/efi/startup.S
+++ b/grub-core/kern/arm64/efi/startup.S
@@ -19,7 +19,9 @@
#include <grub/symbol.h>
.file "startup.S"
+ .globl start, _start
.text
+FUNCTION(start)
FUNCTION(_start)
/*
* EFI_SYSTEM_TABLE and EFI_HANDLE are passed in x1/x0.
diff --git a/grub-core/kern/i386/qemu/startup.S b/grub-core/kern/i386/qemu/startup.S
index 0d89858d9b..939f182fc7 100644
--- a/grub-core/kern/i386/qemu/startup.S
+++ b/grub-core/kern/i386/qemu/startup.S
@@ -24,7 +24,8 @@
.text
.code32
- .globl _start
+ .globl start, _start
+start:
_start:
jmp codestart
diff --git a/grub-core/kern/ia64/efi/startup.S b/grub-core/kern/ia64/efi/startup.S
index d75c6d7cc7..8f2a593e52 100644
--- a/grub-core/kern/ia64/efi/startup.S
+++ b/grub-core/kern/ia64/efi/startup.S
@@ -24,8 +24,9 @@
.psr lsb
.lsb
- .global _start
+ .global start, _start
.proc _start
+start:
_start:
alloc loc0=ar.pfs,2,4,0,0
mov loc1=rp
diff --git a/grub-core/kern/sparc64/ieee1275/crt0.S b/grub-core/kern/sparc64/ieee1275/crt0.S
index 03b916f053..701bf63abc 100644
--- a/grub-core/kern/sparc64/ieee1275/crt0.S
+++ b/grub-core/kern/sparc64/ieee1275/crt0.S
@@ -22,7 +22,8 @@
.text
.align 4
- .globl _start
+ .globl start, _start
+start:
_start:
ba codestart
mov %o4, %o0
diff --git a/grub-core/Makefile.am b/grub-core/Makefile.am
index 80e7a83edf..f512573c0d 100644
--- a/grub-core/Makefile.am
+++ b/grub-core/Makefile.am
@@ -66,6 +66,7 @@ CLEANFILES += grub_script.yy.c grub_script.yy.h
include $(srcdir)/Makefile.core.am
+KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/backtrace.h
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/cache.h
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/command.h
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/device.h