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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
f602be63 HC |
2 | /* |
3 | * Mapping of DWARF debug register numbers into register names. | |
4 | * | |
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5 | * Copyright IBM Corp. 2010, 2017 |
6 | * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>, | |
7 | * Hendrik Brueckner <brueckner@linux.vnet.ibm.com> | |
f602be63 HC |
8 | * |
9 | */ | |
10 | ||
a81c4213 | 11 | #include <errno.h> |
861e10be | 12 | #include <stddef.h> |
a81c4213 | 13 | #include <stdlib.h> |
a9fc2db0 | 14 | #include <linux/kernel.h> |
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15 | #include <asm/ptrace.h> |
16 | #include <string.h> | |
17 | #include <dwarf-regs.h> | |
a9fc2db0 | 18 | #include "dwarf-regs-table.h" |
f602be63 HC |
19 | |
20 | const char *get_arch_regstr(unsigned int n) | |
21 | { | |
a9fc2db0 | 22 | return (n >= ARRAY_SIZE(s390_dwarf_regs)) ? NULL : s390_dwarf_regs[n]; |
f602be63 | 23 | } |
a81c4213 HB |
24 | |
25 | /* | |
26 | * Convert the register name into an offset to struct pt_regs (kernel). | |
27 | * This is required by the BPF prologue generator. The BPF | |
28 | * program is called in the BPF overflow handler in the perf | |
29 | * core. | |
30 | */ | |
31 | int regs_query_register_offset(const char *name) | |
32 | { | |
33 | unsigned long gpr; | |
34 | ||
35 | if (!name || strncmp(name, "%r", 2)) | |
36 | return -EINVAL; | |
37 | ||
38 | errno = 0; | |
39 | gpr = strtoul(name + 2, NULL, 10); | |
40 | if (errno || gpr >= 16) | |
41 | return -EINVAL; | |
42 | ||
43 | return offsetof(user_pt_regs, gprs) + 8 * gpr; | |
44 | } |