1 // SPDX-License-Identifier: GPL-2.0
9  * Copyright (C) 2002-2007 Hewlett-Packard Co
10  *	Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
31 #include <libunwind-ptrace.h>
65 /* Pointer-encoding formats: */
67 #define DW_EH_PE_ptr		0x00	/* pointer-sized unsigned value */
68 #define DW_EH_PE_udata4		0x03	/* unsigned 32-bit value */
69 #define DW_EH_PE_udata8		0x04	/* unsigned 64-bit value */
70 #define DW_EH_PE_sdata4		0x0b	/* signed 32-bit value */
71 #define DW_EH_PE_sdata8		0x0c	/* signed 64-bit value */
73 /* Pointer-encoding application: */
82 #define DW_EH_PE_funcrel	0x40	/* start-of-procedure-relative */
106 		return -EINVAL;		\
136 		return -EINVAL;  in __dw_read_encoded_value()
156 		return -EINVAL;  in __dw_read_encoded_value()
167 		return -EINVAL;                                 \
172 static int elf_section_address_and_offset(int fd, const char *name, u64 *address, u64 *offset)  in elf_section_address_and_offset()  argument
177 	int ret = -1;  in elf_section_address_and_offset()
181 		return -1;  in elf_section_address_and_offset()
190 	*offset = shdr.sh_offset;  in elf_section_address_and_offset()
200 	u64 address, offset = 0;  in elf_section_offset()  local
202 	if (elf_section_address_and_offset(fd, name, &address, &offset))  in elf_section_offset()
205 	return offset;  in elf_section_offset()
222 			retval = phdr.p_vaddr & -getpagesize();  in elf_base_address()
265 	 * The rest of the header is variable-length and consists of the
285 			       u64 offset, u64 *table_data_offset, u64 *fde_count)  in unwind_spec_ehframe()  argument
292 	r = dso__data_read_offset(dso, machine, offset,  in unwind_spec_ehframe()
295 		return -EINVAL;  in unwind_spec_ehframe()
301 	*table_data_offset = enc - (u8 *) &hdr;  in unwind_spec_ehframe()
315 	if (map__dso(map) == args->dso && map__start(map) - map__pgoff(map) < args->base_addr)  in read_unwind_spec_eh_frame_maps_cb()
316 		args->base_addr = map__start(map) - map__pgoff(map);  in read_unwind_spec_eh_frame_maps_cb()
332 	if (dso__data(dso)->eh_frame_hdr_offset == 0) {  in read_unwind_spec_eh_frame()
333 		if (!dso__data_get_fd(dso, ui->machine, &fd))  in read_unwind_spec_eh_frame()
334 			return -EINVAL;  in read_unwind_spec_eh_frame()
338 						     &dso__data(dso)->eh_frame_hdr_addr,  in read_unwind_spec_eh_frame()
339 						     &dso__data(dso)->eh_frame_hdr_offset);  in read_unwind_spec_eh_frame()
340 		dso__data(dso)->elf_base_addr = elf_base_address(fd);  in read_unwind_spec_eh_frame()
342 		if (ret || dso__data(dso)->eh_frame_hdr_offset == 0)  in read_unwind_spec_eh_frame()
343 			return -EINVAL;  in read_unwind_spec_eh_frame()
346 	maps__for_each_map(thread__maps(ui->thread), read_unwind_spec_eh_frame_maps_cb, &args);  in read_unwind_spec_eh_frame()
348 	args.base_addr -= dso__data(dso)->elf_base_addr;  in read_unwind_spec_eh_frame()
350 	*segbase = args.base_addr + dso__data(dso)->eh_frame_hdr_addr;  in read_unwind_spec_eh_frame()
351 	ret = unwind_spec_ehframe(dso, ui->machine, dso__data(dso)->eh_frame_hdr_offset,  in read_unwind_spec_eh_frame()
355 	/* binary_search_table offset plus .eh_frame_hdr address */  in read_unwind_spec_eh_frame()
362 					struct machine *machine, u64 *offset)  in read_unwind_spec_debug_frame()  argument
365 	u64 ofs = dso__data(dso)->debug_frame_offset;  in read_unwind_spec_debug_frame()
368 	 *  - dso  in read_unwind_spec_debug_frame()
369 	 *  - debug pointed by symsrc_filename  in read_unwind_spec_debug_frame()
370 	 *  - gnu_debuglink, which doesn't necessary  in read_unwind_spec_debug_frame()
393 				return -ENOMEM;  in read_unwind_spec_debug_frame()
398 				machine->root_dir, debuglink, PATH_MAX);  in read_unwind_spec_debug_frame()
422 		dso__data(dso)->debug_frame_offset = ofs;  in read_unwind_spec_debug_frame()
425 	*offset = ofs;  in read_unwind_spec_debug_frame()
426 	if (*offset)  in read_unwind_spec_debug_frame()
429 	return -EINVAL;  in read_unwind_spec_debug_frame()
439 	thread__find_map(ui->thread, PERF_RECORD_MISC_USER, ip, &al);  in find_map()
454 	int ret = -EINVAL;  in find_proc_info()
458 		return -EINVAL;  in find_proc_info()
463 		return -EINVAL;  in find_proc_info()
485 	    !read_unwind_spec_debug_frame(dso, ui->machine, &segbase)) {  in find_proc_info()
491 		if (dso__data_get_fd(dso, ui->machine, &fd)) {  in find_proc_info()
516 	return -UNW_EINVAL;  in access_fpreg()
523 	return -UNW_ENOINFO;  in get_dyn_info_list_addr()
526 static int resume(unw_addr_space_t __maybe_unused as,  in resume()  function
530 	pr_err("unwind: resume unsupported\n");  in resume()
531 	return -UNW_EINVAL;  in resume()
541 	return -UNW_EINVAL;  in get_proc_name()
554 		return -1;  in access_dso_mem()
561 		return -1;  in access_dso_mem()
564 	size = dso__data_read_addr(dso, map, ui->machine,  in access_dso_mem()
575 	const char *arch = perf_env__arch(ui->machine->env);  in access_mem()
576 	struct stack_dump *stack = &ui->sample->user_stack;  in access_mem()
578 	int offset;  in access_mem()  local
582 	if (__write || !stack || !ui->sample->user_regs || !ui->sample->user_regs->regs) {  in access_mem()
587 	ret = perf_reg_value(&start, perf_sample__user_regs(ui->sample),  in access_mem()
592 	end = start + stack->size;  in access_mem()
596 		return -EINVAL;  in access_mem()
602 				 " 0x%" PRIx64 "-0x%" PRIx64 "\n",  in access_mem()
610 	offset = addr - start;  in access_mem()
611 	*valp  = *(unw_word_t *)&stack->data[offset];  in access_mem()
612 	pr_debug("unwind: access_mem addr %p val %lx, offset %d\n",  in access_mem()
613 		 (void *) (uintptr_t) addr, (unsigned long)*valp, offset);  in access_mem()
631 	if (!ui->sample->user_regs || !ui->sample->user_regs->regs) {  in access_reg()
638 		return -EINVAL;  in access_reg()
640 	ret = perf_reg_value(&val, perf_sample__user_regs(ui->sample), id);  in access_reg()
642 		if (!ui->best_effort)  in access_reg()
673 		 al.sym ? al.sym->name : "''",  in entry()
706 	.resume			= resume,
717 		return -ENOMEM;  in _unwind__prepare_access()
737 	const char *arch = perf_env__arch(ui->machine->env);  in get_entries()
744 	ret = perf_reg_value(&val, perf_sample__user_regs(ui->sample),  in get_entries()
755 	if (max_stack - 1 > 0) {  in get_entries()
756 		WARN_ONCE(!ui->thread, "WARNING: ui->thread is NULL");  in get_entries()
757 		addr_space = maps__addr_space(thread__maps(ui->thread));  in get_entries()
760 			return -1;  in get_entries()
763 		if (ret && !ui->best_effort)  in get_entries()
770 			 * Decrement the IP for any non-activation frames.  in get_entries()
777 				--ips[i];  in get_entries()
792 			j = max_stack - i - 1;  in get_entries()
793 		ret = ips[j] ? entry(ips[j], ui->thread, cb, arg) : 0;  in get_entries()
811 	if (!data->user_regs || !data->user_regs->regs)  in _unwind__get_entries()
812 		return -EINVAL;  in _unwind__get_entries()
815 		return -EINVAL;  in _unwind__get_entries()