On 24.02.2023 12:31, Oleksii Kurochko wrote:
> --- /dev/null
> +++ b/xen/common/bug.c
> @@ -0,0 +1,109 @@
> +#include <xen/bug.h>
> +#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>
> +
> +#include <asm/processor.h>
> +
> +/* Set default value for TRAP_invalid_op as it is defined only for X86 now */
> +#ifndef TRAP_invalid_op
> +#define TRAP_invalid_op 0
> +#endif
> +
> +int do_bug_frame(const 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 = BUGFRAME_NR, lineno;
> +
> + region = find_text_region(pc);
> + if ( region )
> + {
> + for ( id = 0; id < BUGFRAME_NR; id++ )
> + {
> + const struct bug_frame *b;
> + unsigned int 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 -EINVAL;
> +
> + if ( id == BUGFRAME_run_fn )
> + {
> +#ifdef BUG_FN_REG
> + void (*fn)(const struct cpu_user_regs *) = (void *)regs->BUG_FN_REG;
> +#else
> + void (*fn)(const struct cpu_user_regs *) = bug_ptr(bug);
> +#endif
> +
> + fn(regs);
> +
> + 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);
> +
> + return id;
> +
> + case BUGFRAME_bug:
> + printk("Xen BUG at %s%s:%d\n", prefix, filename, lineno);
> +
> + if ( debugger_trap_fatal(TRAP_invalid_op, regs) )
TRAP_invalid_op is, as said, about to disappear on x86 as well. I think
this construct wants abstracting by another asm/bug.h provided macro
(taking just regs).
Jan
