[PATCH v1 6/7] perf syscalltbl: Use lookup table containing multiple architectures

Ian Rogers
2025-02-01T07:15:23Z

Switch to use the lookup table containing all architectures rather
than tables matching the perf binary.

This fixes perf trace when executed on a 32-bit i386 binary on an
x86-64 machine. Note in the following the system call names of the
32-bit i386 binary as seen by an x86-64 perf.

Before:
```
? ( ): a.out/447296 ... [continued]: munmap()) = 0
0.024 ( 0.001 ms): a.out/447296 recvfrom(ubuf: 0x2, size: 4160585708, flags: DONTROUTE|CTRUNC|TRUNC|DONTWAIT|EOR|WAITALL|FIN|SYN|CONFIRM|RST|ERRQUEUE|NOSIGNAL|WAITFORONE|BATCH|SOCK_DEVMEM|ZEROCOPY|FASTOPEN|CMSG_CLOEXEC|0x91f80000, addr: 0xe30, addr_len: 0xffce438c) = 1475198976
0.042 ( 0.003 ms): a.out/447296 lgetxattr(name: "", value: 0x3, size: 34) = 4160344064
0.054 ( 0.003 ms): a.out/447296 dup2(oldfd: -134422744, newfd: 4) = -1 ENOENT (No such file or directory)
0.060 ( 0.009 ms): a.out/447296 preadv(fd: 4294967196, vec: (struct iovec){.iov_base = (void *)0x2e646c2f6374652f,.iov_len = (__kernel_size_t)7307199665335594867,}, vlen: 557056, pos_h: 4160585708) = 3
0.074 ( 0.004 ms): a.out/447296 lgetxattr(name: "", value: 0x1, size: 2) = 4160237568
0.080 ( 0.001 ms): a.out/447296 lstat(filename: "", statbuf: 0x193f6) = 0
0.089 ( 0.007 ms): a.out/447296 preadv(fd: 4294967196, vec: (struct iovec){.iov_base = (void *)0x3833692f62696c2f,.iov_len = (__kernel_size_t)3276497845987585334,}, vlen: 557056, pos_h: 4160585708) = 3
0.097 ( 0.002 ms): a.out/447296 close(fd: 3</proc/447296/status>) = 512
0.103 ( 0.002 ms): a.out/447296 lgetxattr(name: "", value: 0x1, size: 2050) = 4157935616
0.107 ( 0.007 ms): a.out/447296 lgetxattr(pathname: "", name: "", value: 0x5, size: 2066) = 4158078976
0.116 ( 0.003 ms): a.out/447296 lgetxattr(pathname: "", name: "", value: 0x1, size: 2066) = 4159639552
0.121 ( 0.003 ms): a.out/447296 lgetxattr(pathname: "", name: "", value: 0x3, size: 2066) = 4160184320
0.129 ( 0.002 ms): a.out/447296 lgetxattr(pathname: "", name: "", value: 0x3, size: 50) = 4160196608
0.138 ( 0.001 ms): a.out/447296 lstat(filename: "") = 0
0.145 ( 0.002 ms): a.out/447296 mq_timedreceive(mqdes: 4291706800, u_msg_ptr: 0xf7f9ea48, msg_len: 134616640, u_msg_prio: 0xf7fd7fec, u_abs_timeout: (struct __kernel_timespec){.tv_sec = (__kernel_time64_t)-578174027777317696,.tv_nsec = (long long int)4160349376,}) = 0
0.148 ( 0.001 ms): a.out/447296 mkdirat(dfd: -134617816, pathname: " ��� ���▒���▒���", mode: IFREG|ISUID|IRUSR|IWGRP|0xf7fd0000) = 447296
0.150 ( 0.001 ms): a.out/447296 process_vm_writev(pid: -134617812, lvec: (struct iovec){.iov_base = (void *)0xf7f9e9c8f7f9e4c0,.iov_len = (__kernel_size_t)4160349376,}, liovcnt: 4160588048, rvec: (struct iovec){}, riovcnt: 4160585708, flags: 4291707352) = 0
0.197 ( 0.004 ms): a.out/447296 capget(header: 4160184320, dataptr: 8192) = 0
0.202 ( 0.002 ms): a.out/447296 capget(header: 1448669184, dataptr: 4096) = 0
0.208 ( 0.002 ms): a.out/447296 capget(header: 4160577536, dataptr: 8192) = 0
0.220 ( 0.001 ms): a.out/447296 getxattr(pathname: "", name: "c������", value: 0xf7f77e34, size: 1) = 0
0.228 ( 0.005 ms): a.out/447296 fchmod(fd: -134729728, mode: IRUGO|IWUGO|IFREG|IFIFO|ISVTX|IXUSR|0x10000) = 0
0.240 ( 0.009 ms): a.out/447296 preadv(fd: 4294967196, vec: 0x5658e008, pos_h: 4160192052) = 3
0.250 ( 0.008 ms): a.out/447296 close(fd: 3</proc/447296/status>) = 1436
0.260 ( 0.018 ms): a.out/447296 stat(filename: "", statbuf: 0xffce32ac) = 1436
0.288 (1000.213 ms): a.out/447296 readlinkat(buf: 0xffce31d4, bufsiz: 4291703244) = 0
```

After:
```
? ( ): a.out/442930 ... [continued]: execve()) = 0
0.023 ( 0.002 ms): a.out/442930 brk() = 0x57760000
0.052 ( 0.003 ms): a.out/442930 access(filename: 0xf7f5af28, mode: R) = -1 ENOENT (No such file or directory)
0.059 ( 0.009 ms): a.out/442930 openat(dfd: CWD, filename: "/etc/ld.so.cache", flags: RDONLY|CLOEXEC|LARGEFILE) = 3
0.078 ( 0.001 ms): a.out/442930 close(fd: 3</proc/442930/status>) = 0
0.087 ( 0.007 ms): a.out/442930 openat(dfd: CWD, filename: "/lib/i386-linux-", flags: RDONLY|CLOEXEC|LARGEFILE) = 3
0.095 ( 0.002 ms): a.out/442930 read(fd: 3</proc/442930/status>, buf: 0xffbdbb70, count: 512) = 512
0.135 ( 0.001 ms): a.out/442930 close(fd: 3</proc/442930/status>) = 0
0.148 ( 0.001 ms): a.out/442930 set_tid_address(tidptr: 0xf7f2b528) = 442930 (a.out)
0.150 ( 0.001 ms): a.out/442930 set_robust_list(head: 0xf7f2b52c, len: 12) =
0.196 ( 0.004 ms): a.out/442930 mprotect(start: 0xf7f03000, len: 8192, prot: READ) = 0
0.202 ( 0.002 ms): a.out/442930 mprotect(start: 0x5658e000, len: 4096, prot: READ) = 0
0.207 ( 0.002 ms): a.out/442930 mprotect(start: 0xf7f63000, len: 8192, prot: READ) = 0
0.230 ( 0.005 ms): a.out/442930 munmap(addr: 0xf7f10000, len: 103414) = 0
0.244 ( 0.010 ms): a.out/442930 openat(dfd: CWD, filename: 0x5658d008) = 3
0.255 ( 0.007 ms): a.out/442930 read(fd: 3</proc/442930/status>, buf: 0xffbdb67c, count: 4096) = 1436
0.264 ( 0.018 ms): a.out/442930 write(fd: 1</dev/pts/4>, buf: , count: 1436) = 1436
0.292 (1000.173 ms): a.out/442930 clock_nanosleep(rqtp: { .tv_sec: 17866546940376776704, .tv_nsec: 4159878336 }, rmtp: 0xffbdb59c) = 0
1000.478 ( ): a.out/442930 exit_group() = ?
```

Signed-off-by: Ian Rogers <irogers@google.com>
---
tools/perf/util/syscalltbl.c | 89 ++++++++++++++++++++++++++----------
1 file changed, 64 insertions(+), 25 deletions(-)

diff --git a/tools/perf/util/syscalltbl.c b/tools/perf/util/syscalltbl.c
index 760ac4d0869f..572083ba1efe 100644
--- a/tools/perf/util/syscalltbl.c
+++ b/tools/perf/util/syscalltbl.c
@@ -15,16 +15,39 @@
#include <string.h>
#include "string2.h"

-#if __BITS_PER_LONG == 64
- #include <asm/syscalls_64.h>
-#else
- #include <asm/syscalls_32.h>
-#endif
+#include "trace/beauty/generated/syscalltbl.c"

-const char *syscalltbl__name(int e_machine __maybe_unused, int id)
+static const struct syscalltbl *find_table(int e_machine)
{
- if (id >= 0 && id <= (int)ARRAY_SIZE(syscall_num_to_name))
- return syscall_num_to_name[id];
+ static const struct syscalltbl *last_table;
+ static int last_table_machine = EM_NONE;
+
+ /* Tables only exist for EM_SPARC. */
+ if (e_machine == EM_SPARCV9)
+ e_machine = EM_SPARC;
+
+ if (last_table_machine == e_machine && e_machine != EM_NONE)
+ return last_table;
+
+ for (size_t i = 0; i < ARRAY_SIZE(syscalltbls); i++) {
+ const struct syscalltbl *entry = &syscalltbls[i];
+
+ if (entry->e_machine != e_machine && entry->e_machine != EM_NONE)
+ continue;
+
+ last_table = entry;
+ last_table_machine = e_machine;
+ return entry;
+ }
+ return NULL;
+}
+
+const char *syscalltbl__name(int e_machine, int id)
+{
+ const struct syscalltbl *table = find_table(e_machine);
+
+ if (table && id >= 0 && id < table->num_to_name_len)
+ return table->num_to_name[id];
return NULL;
}

@@ -41,38 +64,54 @@ static int syscallcmpname(const void *vkey, const void *ventry)
return strcmp(key->name, key->tbl[*entry]);
}

-int syscalltbl__id(int e_machine __maybe_unused, const char *name)
+int syscalltbl__id(int e_machine, const char *name)
{
- struct syscall_cmp_key key = {
- .name = name,
- .tbl = syscall_num_to_name,
- };
- const int *id = bsearch(&key, syscall_sorted_names,
- ARRAY_SIZE(syscall_sorted_names),
- sizeof(syscall_sorted_names[0]),
- syscallcmpname);
+ const struct syscalltbl *table = find_table(e_machine);
+ struct syscall_cmp_key key;
+ const int *id;
+
+ if (!table)
+ return -1;
+
+ key.name = name;
+ key.tbl = table->num_to_name;
+ id = bsearch(&key, table->sorted_names, table->sorted_names_len,
+ sizeof(table->sorted_names[0]), syscallcmpname);

return id ? *id : -1;
}

-int syscalltbl__num_idx(int e_machine __maybe_unused)
+int syscalltbl__num_idx(int e_machine)
{
- return ARRAY_SIZE(syscall_sorted_names);
+ const struct syscalltbl *table = find_table(e_machine);
+
+ if (!table)
+ return 0;
+
+ return table->sorted_names_len;
}

-int syscalltbl__id_at_idx(int e_machine __maybe_unused, int idx)
+int syscalltbl__id_at_idx(int e_machine, int idx)
{
- return syscall_sorted_names[idx];
+ const struct syscalltbl *table = find_table(e_machine);
+
+ if (!table)
+ return -1;
+
+ assert(idx >= 0 && idx < table->sorted_names_len);
+ return table->sorted_names[idx];
}

-int syscalltbl__strglobmatch_next(int e_machine __maybe_unused, const char *syscall_glob, int *idx)
+int syscalltbl__strglobmatch_next(int e_machine, const char *syscall_glob, int *idx)
{
- for (int i = *idx + 1; i < (int)ARRAY_SIZE(syscall_sorted_names); ++i) {
- const char *name = syscall_num_to_name[syscall_sorted_names[i]];
+ const struct syscalltbl *table = find_table(e_machine);
+
+ for (int i = *idx + 1; table && i < table->sorted_names_len; ++i) {
+ const char *name = table->num_to_name[table->sorted_names[i]];

if (strglobmatch(name, syscall_glob)) {
*idx = i;
- return syscall_sorted_names[i];
+ return table->sorted_names[i];
}
}

--
2.48.1.362.g079036d154-goog