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Diffstat (limited to 'tools/lib/bpf/usdt.c')
-rw-r--r--tools/lib/bpf/usdt.c196
1 files changed, 118 insertions, 78 deletions
diff --git a/tools/lib/bpf/usdt.c b/tools/lib/bpf/usdt.c
index 75b411fc2c77..b8402e3f9eb2 100644
--- a/tools/lib/bpf/usdt.c
+++ b/tools/lib/bpf/usdt.c
@@ -1141,12 +1141,13 @@ static int parse_usdt_note(Elf *elf, const char *path, GElf_Nhdr *nhdr,
return 0;
}
-static int parse_usdt_arg(const char *arg_str, int arg_num, struct usdt_arg_spec *arg);
+static int parse_usdt_arg(const char *arg_str, int arg_num, struct usdt_arg_spec *arg, int *arg_sz);
static int parse_usdt_spec(struct usdt_spec *spec, const struct usdt_note *note, __u64 usdt_cookie)
{
+ struct usdt_arg_spec *arg;
const char *s;
- int len;
+ int arg_sz, len;
spec->usdt_cookie = usdt_cookie;
spec->arg_cnt = 0;
@@ -1159,10 +1160,25 @@ static int parse_usdt_spec(struct usdt_spec *spec, const struct usdt_note *note,
return -E2BIG;
}
- len = parse_usdt_arg(s, spec->arg_cnt, &spec->args[spec->arg_cnt]);
+ arg = &spec->args[spec->arg_cnt];
+ len = parse_usdt_arg(s, spec->arg_cnt, arg, &arg_sz);
if (len < 0)
return len;
+ arg->arg_signed = arg_sz < 0;
+ if (arg_sz < 0)
+ arg_sz = -arg_sz;
+
+ switch (arg_sz) {
+ case 1: case 2: case 4: case 8:
+ arg->arg_bitshift = 64 - arg_sz * 8;
+ break;
+ default:
+ pr_warn("usdt: unsupported arg #%d (spec '%s') size: %d\n",
+ spec->arg_cnt, s, arg_sz);
+ return -EINVAL;
+ }
+
s += len;
spec->arg_cnt++;
}
@@ -1219,13 +1235,13 @@ static int calc_pt_regs_off(const char *reg_name)
return -ENOENT;
}
-static int parse_usdt_arg(const char *arg_str, int arg_num, struct usdt_arg_spec *arg)
+static int parse_usdt_arg(const char *arg_str, int arg_num, struct usdt_arg_spec *arg, int *arg_sz)
{
char reg_name[16];
- int arg_sz, len, reg_off;
+ int len, reg_off;
long off;
- if (sscanf(arg_str, " %d @ %ld ( %%%15[^)] ) %n", &arg_sz, &off, reg_name, &len) == 3) {
+ if (sscanf(arg_str, " %d @ %ld ( %%%15[^)] ) %n", arg_sz, &off, reg_name, &len) == 3) {
/* Memory dereference case, e.g., -4@-20(%rbp) */
arg->arg_type = USDT_ARG_REG_DEREF;
arg->val_off = off;
@@ -1233,7 +1249,7 @@ static int parse_usdt_arg(const char *arg_str, int arg_num, struct usdt_arg_spec
if (reg_off < 0)
return reg_off;
arg->reg_off = reg_off;
- } else if (sscanf(arg_str, " %d @ ( %%%15[^)] ) %n", &arg_sz, reg_name, &len) == 2) {
+ } else if (sscanf(arg_str, " %d @ ( %%%15[^)] ) %n", arg_sz, reg_name, &len) == 2) {
/* Memory dereference case without offset, e.g., 8@(%rsp) */
arg->arg_type = USDT_ARG_REG_DEREF;
arg->val_off = 0;
@@ -1241,7 +1257,7 @@ static int parse_usdt_arg(const char *arg_str, int arg_num, struct usdt_arg_spec
if (reg_off < 0)
return reg_off;
arg->reg_off = reg_off;
- } else if (sscanf(arg_str, " %d @ %%%15s %n", &arg_sz, reg_name, &len) == 2) {
+ } else if (sscanf(arg_str, " %d @ %%%15s %n", arg_sz, reg_name, &len) == 2) {
/* Register read case, e.g., -4@%eax */
arg->arg_type = USDT_ARG_REG;
arg->val_off = 0;
@@ -1250,7 +1266,7 @@ static int parse_usdt_arg(const char *arg_str, int arg_num, struct usdt_arg_spec
if (reg_off < 0)
return reg_off;
arg->reg_off = reg_off;
- } else if (sscanf(arg_str, " %d @ $%ld %n", &arg_sz, &off, &len) == 2) {
+ } else if (sscanf(arg_str, " %d @ $%ld %n", arg_sz, &off, &len) == 2) {
/* Constant value case, e.g., 4@$71 */
arg->arg_type = USDT_ARG_CONST;
arg->val_off = off;
@@ -1260,20 +1276,6 @@ static int parse_usdt_arg(const char *arg_str, int arg_num, struct usdt_arg_spec
return -EINVAL;
}
- arg->arg_signed = arg_sz < 0;
- if (arg_sz < 0)
- arg_sz = -arg_sz;
-
- switch (arg_sz) {
- case 1: case 2: case 4: case 8:
- arg->arg_bitshift = 64 - arg_sz * 8;
- break;
- default:
- pr_warn("usdt: unsupported arg #%d (spec '%s') size: %d\n",
- arg_num, arg_str, arg_sz);
- return -EINVAL;
- }
-
return len;
}
@@ -1281,13 +1283,13 @@ static int parse_usdt_arg(const char *arg_str, int arg_num, struct usdt_arg_spec
/* Do not support __s390__ for now, since user_pt_regs is broken with -m31. */
-static int parse_usdt_arg(const char *arg_str, int arg_num, struct usdt_arg_spec *arg)
+static int parse_usdt_arg(const char *arg_str, int arg_num, struct usdt_arg_spec *arg, int *arg_sz)
{
unsigned int reg;
- int arg_sz, len;
+ int len;
long off;
- if (sscanf(arg_str, " %d @ %ld ( %%r%u ) %n", &arg_sz, &off, &reg, &len) == 3) {
+ if (sscanf(arg_str, " %d @ %ld ( %%r%u ) %n", arg_sz, &off, &reg, &len) == 3) {
/* Memory dereference case, e.g., -2@-28(%r15) */
arg->arg_type = USDT_ARG_REG_DEREF;
arg->val_off = off;
@@ -1296,7 +1298,7 @@ static int parse_usdt_arg(const char *arg_str, int arg_num, struct usdt_arg_spec
return -EINVAL;
}
arg->reg_off = offsetof(user_pt_regs, gprs[reg]);
- } else if (sscanf(arg_str, " %d @ %%r%u %n", &arg_sz, &reg, &len) == 2) {
+ } else if (sscanf(arg_str, " %d @ %%r%u %n", arg_sz, &reg, &len) == 2) {
/* Register read case, e.g., -8@%r0 */
arg->arg_type = USDT_ARG_REG;
arg->val_off = 0;
@@ -1305,7 +1307,7 @@ static int parse_usdt_arg(const char *arg_str, int arg_num, struct usdt_arg_spec
return -EINVAL;
}
arg->reg_off = offsetof(user_pt_regs, gprs[reg]);
- } else if (sscanf(arg_str, " %d @ %ld %n", &arg_sz, &off, &len) == 2) {
+ } else if (sscanf(arg_str, " %d @ %ld %n", arg_sz, &off, &len) == 2) {
/* Constant value case, e.g., 4@71 */
arg->arg_type = USDT_ARG_CONST;
arg->val_off = off;
@@ -1315,20 +1317,6 @@ static int parse_usdt_arg(const char *arg_str, int arg_num, struct usdt_arg_spec
return -EINVAL;
}
- arg->arg_signed = arg_sz < 0;
- if (arg_sz < 0)
- arg_sz = -arg_sz;
-
- switch (arg_sz) {
- case 1: case 2: case 4: case 8:
- arg->arg_bitshift = 64 - arg_sz * 8;
- break;
- default:
- pr_warn("usdt: unsupported arg #%d (spec '%s') size: %d\n",
- arg_num, arg_str, arg_sz);
- return -EINVAL;
- }
-
return len;
}
@@ -1348,13 +1336,13 @@ static int calc_pt_regs_off(const char *reg_name)
return -ENOENT;
}
-static int parse_usdt_arg(const char *arg_str, int arg_num, struct usdt_arg_spec *arg)
+static int parse_usdt_arg(const char *arg_str, int arg_num, struct usdt_arg_spec *arg, int *arg_sz)
{
char reg_name[16];
- int arg_sz, len, reg_off;
+ int len, reg_off;
long off;
- if (sscanf(arg_str, " %d @ \[ %15[a-z0-9], %ld ] %n", &arg_sz, reg_name, &off, &len) == 3) {
+ if (sscanf(arg_str, " %d @ \[ %15[a-z0-9] , %ld ] %n", arg_sz, reg_name, &off, &len) == 3) {
/* Memory dereference case, e.g., -4@[sp, 96] */
arg->arg_type = USDT_ARG_REG_DEREF;
arg->val_off = off;
@@ -1362,7 +1350,7 @@ static int parse_usdt_arg(const char *arg_str, int arg_num, struct usdt_arg_spec
if (reg_off < 0)
return reg_off;
arg->reg_off = reg_off;
- } else if (sscanf(arg_str, " %d @ \[ %15[a-z0-9] ] %n", &arg_sz, reg_name, &len) == 2) {
+ } else if (sscanf(arg_str, " %d @ \[ %15[a-z0-9] ] %n", arg_sz, reg_name, &len) == 2) {
/* Memory dereference case, e.g., -4@[sp] */
arg->arg_type = USDT_ARG_REG_DEREF;
arg->val_off = 0;
@@ -1370,12 +1358,12 @@ static int parse_usdt_arg(const char *arg_str, int arg_num, struct usdt_arg_spec
if (reg_off < 0)
return reg_off;
arg->reg_off = reg_off;
- } else if (sscanf(arg_str, " %d @ %ld %n", &arg_sz, &off, &len) == 2) {
+ } else if (sscanf(arg_str, " %d @ %ld %n", arg_sz, &off, &len) == 2) {
/* Constant value case, e.g., 4@5 */
arg->arg_type = USDT_ARG_CONST;
arg->val_off = off;
arg->reg_off = 0;
- } else if (sscanf(arg_str, " %d @ %15[a-z0-9] %n", &arg_sz, reg_name, &len) == 2) {
+ } else if (sscanf(arg_str, " %d @ %15[a-z0-9] %n", arg_sz, reg_name, &len) == 2) {
/* Register read case, e.g., -8@x4 */
arg->arg_type = USDT_ARG_REG;
arg->val_off = 0;
@@ -1388,20 +1376,6 @@ static int parse_usdt_arg(const char *arg_str, int arg_num, struct usdt_arg_spec
return -EINVAL;
}
- arg->arg_signed = arg_sz < 0;
- if (arg_sz < 0)
- arg_sz = -arg_sz;
-
- switch (arg_sz) {
- case 1: case 2: case 4: case 8:
- arg->arg_bitshift = 64 - arg_sz * 8;
- break;
- default:
- pr_warn("usdt: unsupported arg #%d (spec '%s') size: %d\n",
- arg_num, arg_str, arg_sz);
- return -EINVAL;
- }
-
return len;
}
@@ -1456,13 +1430,13 @@ static int calc_pt_regs_off(const char *reg_name)
return -ENOENT;
}
-static int parse_usdt_arg(const char *arg_str, int arg_num, struct usdt_arg_spec *arg)
+static int parse_usdt_arg(const char *arg_str, int arg_num, struct usdt_arg_spec *arg, int *arg_sz)
{
char reg_name[16];
- int arg_sz, len, reg_off;
+ int len, reg_off;
long off;
- if (sscanf(arg_str, " %d @ %ld ( %15[a-z0-9] ) %n", &arg_sz, &off, reg_name, &len) == 3) {
+ if (sscanf(arg_str, " %d @ %ld ( %15[a-z0-9] ) %n", arg_sz, &off, reg_name, &len) == 3) {
/* Memory dereference case, e.g., -8@-88(s0) */
arg->arg_type = USDT_ARG_REG_DEREF;
arg->val_off = off;
@@ -1470,12 +1444,12 @@ static int parse_usdt_arg(const char *arg_str, int arg_num, struct usdt_arg_spec
if (reg_off < 0)
return reg_off;
arg->reg_off = reg_off;
- } else if (sscanf(arg_str, " %d @ %ld %n", &arg_sz, &off, &len) == 2) {
+ } else if (sscanf(arg_str, " %d @ %ld %n", arg_sz, &off, &len) == 2) {
/* Constant value case, e.g., 4@5 */
arg->arg_type = USDT_ARG_CONST;
arg->val_off = off;
arg->reg_off = 0;
- } else if (sscanf(arg_str, " %d @ %15[a-z0-9] %n", &arg_sz, reg_name, &len) == 2) {
+ } else if (sscanf(arg_str, " %d @ %15[a-z0-9] %n", arg_sz, reg_name, &len) == 2) {
/* Register read case, e.g., -8@a1 */
arg->arg_type = USDT_ARG_REG;
arg->val_off = 0;
@@ -1488,17 +1462,83 @@ static int parse_usdt_arg(const char *arg_str, int arg_num, struct usdt_arg_spec
return -EINVAL;
}
- arg->arg_signed = arg_sz < 0;
- if (arg_sz < 0)
- arg_sz = -arg_sz;
+ return len;
+}
- switch (arg_sz) {
- case 1: case 2: case 4: case 8:
- arg->arg_bitshift = 64 - arg_sz * 8;
- break;
- default:
- pr_warn("usdt: unsupported arg #%d (spec '%s') size: %d\n",
- arg_num, arg_str, arg_sz);
+#elif defined(__arm__)
+
+static int calc_pt_regs_off(const char *reg_name)
+{
+ static struct {
+ const char *name;
+ size_t pt_regs_off;
+ } reg_map[] = {
+ { "r0", offsetof(struct pt_regs, uregs[0]) },
+ { "r1", offsetof(struct pt_regs, uregs[1]) },
+ { "r2", offsetof(struct pt_regs, uregs[2]) },
+ { "r3", offsetof(struct pt_regs, uregs[3]) },
+ { "r4", offsetof(struct pt_regs, uregs[4]) },
+ { "r5", offsetof(struct pt_regs, uregs[5]) },
+ { "r6", offsetof(struct pt_regs, uregs[6]) },
+ { "r7", offsetof(struct pt_regs, uregs[7]) },
+ { "r8", offsetof(struct pt_regs, uregs[8]) },
+ { "r9", offsetof(struct pt_regs, uregs[9]) },
+ { "r10", offsetof(struct pt_regs, uregs[10]) },
+ { "fp", offsetof(struct pt_regs, uregs[11]) },
+ { "ip", offsetof(struct pt_regs, uregs[12]) },
+ { "sp", offsetof(struct pt_regs, uregs[13]) },
+ { "lr", offsetof(struct pt_regs, uregs[14]) },
+ { "pc", offsetof(struct pt_regs, uregs[15]) },
+ };
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(reg_map); i++) {
+ if (strcmp(reg_name, reg_map[i].name) == 0)
+ return reg_map[i].pt_regs_off;
+ }
+
+ pr_warn("usdt: unrecognized register '%s'\n", reg_name);
+ return -ENOENT;
+}
+
+static int parse_usdt_arg(const char *arg_str, int arg_num, struct usdt_arg_spec *arg, int *arg_sz)
+{
+ char reg_name[16];
+ int len, reg_off;
+ long off;
+
+ if (sscanf(arg_str, " %d @ \[ %15[a-z0-9] , #%ld ] %n",
+ arg_sz, reg_name, &off, &len) == 3) {
+ /* Memory dereference case, e.g., -4@[fp, #96] */
+ arg->arg_type = USDT_ARG_REG_DEREF;
+ arg->val_off = off;
+ reg_off = calc_pt_regs_off(reg_name);
+ if (reg_off < 0)
+ return reg_off;
+ arg->reg_off = reg_off;
+ } else if (sscanf(arg_str, " %d @ \[ %15[a-z0-9] ] %n", arg_sz, reg_name, &len) == 2) {
+ /* Memory dereference case, e.g., -4@[sp] */
+ arg->arg_type = USDT_ARG_REG_DEREF;
+ arg->val_off = 0;
+ reg_off = calc_pt_regs_off(reg_name);
+ if (reg_off < 0)
+ return reg_off;
+ arg->reg_off = reg_off;
+ } else if (sscanf(arg_str, " %d @ #%ld %n", arg_sz, &off, &len) == 2) {
+ /* Constant value case, e.g., 4@#5 */
+ arg->arg_type = USDT_ARG_CONST;
+ arg->val_off = off;
+ arg->reg_off = 0;
+ } else if (sscanf(arg_str, " %d @ %15[a-z0-9] %n", arg_sz, reg_name, &len) == 2) {
+ /* Register read case, e.g., -8@r4 */
+ arg->arg_type = USDT_ARG_REG;
+ arg->val_off = 0;
+ reg_off = calc_pt_regs_off(reg_name);
+ if (reg_off < 0)
+ return reg_off;
+ arg->reg_off = reg_off;
+ } else {
+ pr_warn("usdt: unrecognized arg #%d spec '%s'\n", arg_num, arg_str);
return -EINVAL;
}
@@ -1507,7 +1547,7 @@ static int parse_usdt_arg(const char *arg_str, int arg_num, struct usdt_arg_spec
#else
-static int parse_usdt_arg(const char *arg_str, int arg_num, struct usdt_arg_spec *arg)
+static int parse_usdt_arg(const char *arg_str, int arg_num, struct usdt_arg_spec *arg, int *arg_sz)
{
pr_warn("usdt: libbpf doesn't support USDTs on current architecture\n");
return -ENOTSUP;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.