tools/perf/arch/powerpc/util/perf_regs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <errno.h>
   3 #include <string.h>
   4 #include <regex.h>
   5 #include <linux/zalloc.h>
   6
   7 #include "../../perf.h"
   8 #include "../../util/perf_regs.h"
   9 #include "../../util/debug.h"
  10
  11 #include <linux/kernel.h>
  12
  13 const struct sample_reg sample_reg_masks[] = {
  14         SMPL_REG(r0, PERF_REG_POWERPC_R0),
  15         SMPL_REG(r1, PERF_REG_POWERPC_R1),
  16         SMPL_REG(r2, PERF_REG_POWERPC_R2),
  17         SMPL_REG(r3, PERF_REG_POWERPC_R3),
  18         SMPL_REG(r4, PERF_REG_POWERPC_R4),
  19         SMPL_REG(r5, PERF_REG_POWERPC_R5),
  20         SMPL_REG(r6, PERF_REG_POWERPC_R6),
  21         SMPL_REG(r7, PERF_REG_POWERPC_R7),
  22         SMPL_REG(r8, PERF_REG_POWERPC_R8),
  23         SMPL_REG(r9, PERF_REG_POWERPC_R9),
  24         SMPL_REG(r10, PERF_REG_POWERPC_R10),
  25         SMPL_REG(r11, PERF_REG_POWERPC_R11),
  26         SMPL_REG(r12, PERF_REG_POWERPC_R12),
  27         SMPL_REG(r13, PERF_REG_POWERPC_R13),
  28         SMPL_REG(r14, PERF_REG_POWERPC_R14),
  29         SMPL_REG(r15, PERF_REG_POWERPC_R15),
  30         SMPL_REG(r16, PERF_REG_POWERPC_R16),
  31         SMPL_REG(r17, PERF_REG_POWERPC_R17),
  32         SMPL_REG(r18, PERF_REG_POWERPC_R18),
  33         SMPL_REG(r19, PERF_REG_POWERPC_R19),
  34         SMPL_REG(r20, PERF_REG_POWERPC_R20),
  35         SMPL_REG(r21, PERF_REG_POWERPC_R21),
  36         SMPL_REG(r22, PERF_REG_POWERPC_R22),
  37         SMPL_REG(r23, PERF_REG_POWERPC_R23),
  38         SMPL_REG(r24, PERF_REG_POWERPC_R24),
  39         SMPL_REG(r25, PERF_REG_POWERPC_R25),
  40         SMPL_REG(r26, PERF_REG_POWERPC_R26),
  41         SMPL_REG(r27, PERF_REG_POWERPC_R27),
  42         SMPL_REG(r28, PERF_REG_POWERPC_R28),
  43         SMPL_REG(r29, PERF_REG_POWERPC_R29),
  44         SMPL_REG(r30, PERF_REG_POWERPC_R30),
  45         SMPL_REG(r31, PERF_REG_POWERPC_R31),
  46         SMPL_REG(nip, PERF_REG_POWERPC_NIP),
  47         SMPL_REG(msr, PERF_REG_POWERPC_MSR),
  48         SMPL_REG(orig_r3, PERF_REG_POWERPC_ORIG_R3),
  49         SMPL_REG(ctr, PERF_REG_POWERPC_CTR),
  50         SMPL_REG(link, PERF_REG_POWERPC_LINK),
  51         SMPL_REG(xer, PERF_REG_POWERPC_XER),
  52         SMPL_REG(ccr, PERF_REG_POWERPC_CCR),
  53         SMPL_REG(softe, PERF_REG_POWERPC_SOFTE),
  54         SMPL_REG(trap, PERF_REG_POWERPC_TRAP),
  55         SMPL_REG(dar, PERF_REG_POWERPC_DAR),
  56         SMPL_REG(dsisr, PERF_REG_POWERPC_DSISR),
  57         SMPL_REG(sier, PERF_REG_POWERPC_SIER),
  58         SMPL_REG(mmcra, PERF_REG_POWERPC_MMCRA),
  59         SMPL_REG_END
  60 };
  61
  62 /* REG or %rREG */
  63 #define SDT_OP_REGEX1  "^(%r)?([1-2]?[0-9]|3[0-1])$"
  64
  65 /* -NUM(REG) or NUM(REG) or -NUM(%rREG) or NUM(%rREG) */
  66 #define SDT_OP_REGEX2  "^(\\-)?([0-9]+)\\((%r)?([1-2]?[0-9]|3[0-1])\\)$"
  67
  68 static regex_t sdt_op_regex1, sdt_op_regex2;
  69
  70 static int sdt_init_op_regex(void)
  71 {
  72         static int initialized;
  73         int ret = 0;
  74
  75         if (initialized)
  76                 return 0;
  77
  78         ret = regcomp(&sdt_op_regex1, SDT_OP_REGEX1, REG_EXTENDED);
  79         if (ret)
  80                 goto error;
  81
  82         ret = regcomp(&sdt_op_regex2, SDT_OP_REGEX2, REG_EXTENDED);
  83         if (ret)
  84                 goto free_regex1;
  85
  86         initialized = 1;
  87         return 0;
  88
  89 free_regex1:
  90         regfree(&sdt_op_regex1);
  91 error:
  92         pr_debug4("Regex compilation error.\n");
  93         return ret;
  94 }
  95
  96 /*
  97  * Parse OP and convert it into uprobe format, which is, +/-NUM(%gprREG).
  98  * Possible variants of OP are:
  99  *      Format          Example
 100  *      -------------------------
 101  *      NUM(REG)        48(18)
 102  *      -NUM(REG)       -48(18)
 103  *      NUM(%rREG)      48(%r18)
 104  *      -NUM(%rREG)     -48(%r18)
 105  *      REG             18
 106  *      %rREG           %r18
 107  *      iNUM            i0
 108  *      i-NUM           i-1
 109  *
 110  * SDT marker arguments on Powerpc uses %rREG form with -mregnames flag
 111  * and REG form with -mno-regnames. Here REG is general purpose register,
 112  * which is in 0 to 31 range.
 113  */
 114 int arch_sdt_arg_parse_op(char *old_op, char **new_op)
 115 {
 116         int ret, new_len;
 117         regmatch_t rm[5];
 118         char prefix;
 119
 120         /* Constant argument. Uprobe does not support it */
 121         if (old_op[0] == 'i') {
 122                 pr_debug4("Skipping unsupported SDT argument: %s\n", old_op);
 123                 return SDT_ARG_SKIP;
 124         }
 125
 126         ret = sdt_init_op_regex();
 127         if (ret < 0)
 128                 return ret;
 129
 130         if (!regexec(&sdt_op_regex1, old_op, 3, rm, 0)) {
 131                 /* REG or %rREG --> %gprREG */
 132
 133                 new_len = 5;    /* % g p r NULL */
 134                 new_len += (int)(rm[2].rm_eo - rm[2].rm_so);
 135
 136                 *new_op = zalloc(new_len);
 137                 if (!*new_op)
 138                         return -ENOMEM;
 139
 140                 scnprintf(*new_op, new_len, "%%gpr%.*s",
 141                         (int)(rm[2].rm_eo - rm[2].rm_so), old_op + rm[2].rm_so);
 142         } else if (!regexec(&sdt_op_regex2, old_op, 5, rm, 0)) {
 143                 /*
 144                  * -NUM(REG) or NUM(REG) or -NUM(%rREG) or NUM(%rREG) -->
 145                  *      +/-NUM(%gprREG)
 146                  */
 147                 prefix = (rm[1].rm_so == -1) ? '+' : '-';
 148
 149                 new_len = 8;    /* +/- ( % g p r ) NULL */
 150                 new_len += (int)(rm[2].rm_eo - rm[2].rm_so);
 151                 new_len += (int)(rm[4].rm_eo - rm[4].rm_so);
 152
 153                 *new_op = zalloc(new_len);
 154                 if (!*new_op)
 155                         return -ENOMEM;
 156
 157                 scnprintf(*new_op, new_len, "%c%.*s(%%gpr%.*s)", prefix,
 158                         (int)(rm[2].rm_eo - rm[2].rm_so), old_op + rm[2].rm_so,
 159                         (int)(rm[4].rm_eo - rm[4].rm_so), old_op + rm[4].rm_so);
 160         } else {
 161                 pr_debug4("Skipping unsupported SDT argument: %s\n", old_op);
 162                 return SDT_ARG_SKIP;
 163         }
 164
 165         return SDT_ARG_VALID;
 166 }