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