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#include <xen/bug.h>
/*
* Ideally <xen/debugger.h> should be included in <asm/bug.h>
* but an issue with compilation can occur as <xen/debugger.h> uses
* BUG/ASSERT/etc macros inside but they will be defined later in
* <xen/bug.h> after return from inclusion of <asm/bug.h>:
*
* <xen/bug.h>:
* ...
* <asm/bug.h>:
* ...
* <xen/debugger.h> -> some of included header in it uses BUG/ASSERT/etc
* ...
* ...
* #define BUG() ...
* ...
* #define ASSERT() ...
* ...
*/
#include <xen/debugger.h>
#include <xen/errno.h>
#include <xen/kernel.h>
#include <xen/livepatch.h>
#include <xen/string.h>
#include <xen/types.h>
#include <xen/virtual_region.h>
/*
* Returns a negative value in case of an error otherwise
* BUGFRAME_{run_fn, warn, bug, assert}
*/
int do_bug_frame(struct cpu_user_regs *regs, unsigned long pc)
{
const struct bug_frame *bug = NULL;
const struct virtual_region *region;
const char *prefix = "", *filename, *predicate;
unsigned long fixup;
unsigned int id, lineno;
region = find_text_region(pc);
if ( !region )
return -EINVAL;
for ( id = 0; id < BUGFRAME_NR; id++ )
{
const struct bug_frame *b;
size_t i;
for ( i = 0, b = region->frame[id].bugs;
i < region->frame[id].n_bugs; b++, i++ )
{
if ( bug_loc(b) == pc )
{
bug = b;
goto found;
}
}
}
found:
if ( !bug )
return -ENOENT;
if ( id == BUGFRAME_run_fn )
{
void (*fn)(struct cpu_user_regs *) = bug_ptr(bug);
fn(regs);
/* Re-enforce consistent types, because of the casts involved. */
if ( false )
run_in_exception_handler(fn);
return id;
}
/* WARN, BUG or ASSERT: decode the filename pointer and line number. */
filename = bug_ptr(bug);
if ( !is_kernel(filename) && !is_patch(filename) )
return -EINVAL;
fixup = strlen(filename);
if ( fixup > 50 )
{
filename += fixup - 47;
prefix = "...";
}
lineno = bug_line(bug);
switch ( id )
{
case BUGFRAME_warn:
printk("Xen WARN at %s%s:%d\n", prefix, filename, lineno);
show_execution_state(regs);
break;
case BUGFRAME_bug:
printk("Xen BUG at %s%s:%d\n", prefix, filename, lineno);
if ( BUG_DEBUGGER_TRAP_FATAL(regs) )
break;
show_execution_state(regs);
panic("Xen BUG at %s%s:%d\n", prefix, filename, lineno);
case BUGFRAME_assert:
/* ASSERT: decode the predicate string pointer. */
predicate = bug_msg(bug);
if ( !is_kernel(predicate) && !is_patch(predicate) )
predicate = "<unknown>";
printk("Assertion '%s' failed at %s%s:%d\n",
predicate, prefix, filename, lineno);
if ( BUG_DEBUGGER_TRAP_FATAL(regs) )
break;
show_execution_state(regs);
panic("Assertion '%s' failed at %s%s:%d\n",
predicate, prefix, filename, lineno);
}
return id;
}
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