106 lines
2.2 KiB
C
106 lines
2.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/types.h>
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#include <linux/string.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <internal/lib.h> // page_size
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#include "../../util/machine.h"
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#include "../../util/map.h"
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#include "../../util/symbol.h"
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#include <linux/ctype.h>
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#include <symbol/kallsyms.h>
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#if defined(__x86_64__)
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struct extra_kernel_map_info {
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int cnt;
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int max_cnt;
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struct extra_kernel_map *maps;
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bool get_entry_trampolines;
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u64 entry_trampoline;
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};
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static int add_extra_kernel_map(struct extra_kernel_map_info *mi, u64 start,
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u64 end, u64 pgoff, const char *name)
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{
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if (mi->cnt >= mi->max_cnt) {
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void *buf;
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size_t sz;
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mi->max_cnt = mi->max_cnt ? mi->max_cnt * 2 : 32;
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sz = sizeof(struct extra_kernel_map) * mi->max_cnt;
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buf = realloc(mi->maps, sz);
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if (!buf)
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return -1;
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mi->maps = buf;
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}
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mi->maps[mi->cnt].start = start;
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mi->maps[mi->cnt].end = end;
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mi->maps[mi->cnt].pgoff = pgoff;
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strlcpy(mi->maps[mi->cnt].name, name, KMAP_NAME_LEN);
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mi->cnt += 1;
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return 0;
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}
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static int find_extra_kernel_maps(void *arg, const char *name, char type,
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u64 start)
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{
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struct extra_kernel_map_info *mi = arg;
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if (!mi->entry_trampoline && kallsyms2elf_binding(type) == STB_GLOBAL &&
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!strcmp(name, "_entry_trampoline")) {
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mi->entry_trampoline = start;
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return 0;
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}
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if (is_entry_trampoline(name)) {
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u64 end = start + page_size;
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return add_extra_kernel_map(mi, start, end, 0, name);
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}
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return 0;
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}
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int machine__create_extra_kernel_maps(struct machine *machine,
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struct dso *kernel)
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{
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struct extra_kernel_map_info mi = { .cnt = 0, };
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char filename[PATH_MAX];
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int ret;
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int i;
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machine__get_kallsyms_filename(machine, filename, PATH_MAX);
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if (symbol__restricted_filename(filename, "/proc/kallsyms"))
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return 0;
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ret = kallsyms__parse(filename, &mi, find_extra_kernel_maps);
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if (ret)
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goto out_free;
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if (!mi.entry_trampoline)
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goto out_free;
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for (i = 0; i < mi.cnt; i++) {
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struct extra_kernel_map *xm = &mi.maps[i];
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xm->pgoff = mi.entry_trampoline;
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ret = machine__create_extra_kernel_map(machine, kernel, xm);
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if (ret)
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goto out_free;
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}
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machine->trampolines_mapped = mi.cnt;
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out_free:
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free(mi.maps);
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return ret;
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}
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#endif
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