diff options
Diffstat (limited to 'tools/testing/selftests/bpf/trace_helpers.c')
| -rw-r--r-- | tools/testing/selftests/bpf/trace_helpers.c | 121 |
1 files changed, 105 insertions, 16 deletions
diff --git a/tools/testing/selftests/bpf/trace_helpers.c b/tools/testing/selftests/bpf/trace_helpers.c index 70e29f316fe7..81943c6254e6 100644 --- a/tools/testing/selftests/bpf/trace_helpers.c +++ b/tools/testing/selftests/bpf/trace_helpers.c @@ -10,6 +10,8 @@ #include <pthread.h> #include <unistd.h> #include <linux/perf_event.h> +#include <linux/fs.h> +#include <sys/ioctl.h> #include <sys/mman.h> #include "trace_helpers.h" #include <linux/limits.h> @@ -211,7 +213,7 @@ long ksym_get_addr(const char *name) */ int kallsyms_find(const char *sym, unsigned long long *addr) { - char type, name[500]; + char type, name[500], *match; unsigned long long value; int err = 0; FILE *f; @@ -221,6 +223,17 @@ int kallsyms_find(const char *sym, unsigned long long *addr) return -EINVAL; while (fscanf(f, "%llx %c %499s%*[^\n]\n", &value, &type, name) > 0) { + /* If CONFIG_LTO_CLANG_THIN is enabled, static variable/function + * symbols could be promoted to global due to cross-file inlining. + * For such cases, clang compiler will add .llvm.<hash> suffix + * to those symbols to avoid potential naming conflict. + * Let us ignore .llvm.<hash> suffix during symbol comparison. + */ + if (type == 'd') { + match = strstr(name, ".llvm."); + if (match) + *match = '\0'; + } if (strcmp(name, sym) == 0) { *addr = value; goto out; @@ -233,29 +246,95 @@ out: return err; } +#ifdef PROCMAP_QUERY +int env_verbosity __weak = 0; + +static int procmap_query(int fd, const void *addr, __u32 query_flags, size_t *start, size_t *offset, int *flags) +{ + char path_buf[PATH_MAX], build_id_buf[20]; + struct procmap_query q; + int err; + + memset(&q, 0, sizeof(q)); + q.size = sizeof(q); + q.query_flags = query_flags; + q.query_addr = (__u64)addr; + q.vma_name_addr = (__u64)path_buf; + q.vma_name_size = sizeof(path_buf); + q.build_id_addr = (__u64)build_id_buf; + q.build_id_size = sizeof(build_id_buf); + + err = ioctl(fd, PROCMAP_QUERY, &q); + if (err < 0) { + err = -errno; + if (err == -ENOTTY) + return -EOPNOTSUPP; /* ioctl() not implemented yet */ + if (err == -ENOENT) + return -ESRCH; /* vma not found */ + return err; + } + + if (env_verbosity >= 1) { + printf("VMA FOUND (addr %08lx): %08lx-%08lx %c%c%c%c %08lx %02x:%02x %ld %s (build ID: %s, %d bytes)\n", + (long)addr, (long)q.vma_start, (long)q.vma_end, + (q.vma_flags & PROCMAP_QUERY_VMA_READABLE) ? 'r' : '-', + (q.vma_flags & PROCMAP_QUERY_VMA_WRITABLE) ? 'w' : '-', + (q.vma_flags & PROCMAP_QUERY_VMA_EXECUTABLE) ? 'x' : '-', + (q.vma_flags & PROCMAP_QUERY_VMA_SHARED) ? 's' : 'p', + (long)q.vma_offset, q.dev_major, q.dev_minor, (long)q.inode, + q.vma_name_size ? path_buf : "", + q.build_id_size ? "YES" : "NO", + q.build_id_size); + } + + *start = q.vma_start; + *offset = q.vma_offset; + *flags = q.vma_flags; + return 0; +} +#else +# ifndef PROCMAP_QUERY_VMA_EXECUTABLE +# define PROCMAP_QUERY_VMA_EXECUTABLE 0x04 +# endif + +static int procmap_query(int fd, const void *addr, __u32 query_flags, size_t *start, size_t *offset, int *flags) +{ + return -EOPNOTSUPP; +} +#endif + ssize_t get_uprobe_offset(const void *addr) { - size_t start, end, base; - char buf[256]; - bool found = false; + size_t start, base, end; FILE *f; + char buf[256]; + int err, flags; f = fopen("/proc/self/maps", "r"); if (!f) return -errno; - while (fscanf(f, "%zx-%zx %s %zx %*[^\n]\n", &start, &end, buf, &base) == 4) { - if (buf[2] == 'x' && (uintptr_t)addr >= start && (uintptr_t)addr < end) { - found = true; - break; + /* requested executable VMA only */ + err = procmap_query(fileno(f), addr, PROCMAP_QUERY_VMA_EXECUTABLE, &start, &base, &flags); + if (err == -EOPNOTSUPP) { + bool found = false; + + while (fscanf(f, "%zx-%zx %s %zx %*[^\n]\n", &start, &end, buf, &base) == 4) { + if (buf[2] == 'x' && (uintptr_t)addr >= start && (uintptr_t)addr < end) { + found = true; + break; + } + } + if (!found) { + fclose(f); + return -ESRCH; } + } else if (err) { + fclose(f); + return err; } - fclose(f); - if (!found) - return -ESRCH; - #if defined(__powerpc64__) && defined(_CALL_ELF) && _CALL_ELF == 2 #define OP_RT_RA_MASK 0xffff0000UL @@ -296,15 +375,25 @@ ssize_t get_rel_offset(uintptr_t addr) size_t start, end, offset; char buf[256]; FILE *f; + int err, flags; f = fopen("/proc/self/maps", "r"); if (!f) return -errno; - while (fscanf(f, "%zx-%zx %s %zx %*[^\n]\n", &start, &end, buf, &offset) == 4) { - if (addr >= start && addr < end) { - fclose(f); - return (size_t)addr - start + offset; + err = procmap_query(fileno(f), (const void *)addr, 0, &start, &offset, &flags); + if (err == 0) { + fclose(f); + return (size_t)addr - start + offset; + } else if (err != -EOPNOTSUPP) { + fclose(f); + return err; + } else if (err) { + while (fscanf(f, "%zx-%zx %s %zx %*[^\n]\n", &start, &end, buf, &offset) == 4) { + if (addr >= start && addr < end) { + fclose(f); + return (size_t)addr - start + offset; + } } } |