From 3622e7e4935105991dc648bca650c858576aecda Mon Sep 17 00:00:00 2001 From: Alexei Starovoitov Date: Mon, 7 Mar 2016 21:57:19 -0800 Subject: [PATCH] samples/bpf: move ksym_search() into library move ksym search from offwaketime into library to be reused in other tests Signed-off-by: Alexei Starovoitov Signed-off-by: David S. Miller --- samples/bpf/bpf_load.c | 62 +++++++++++++++++++++++++++++++ samples/bpf/bpf_load.h | 6 +++ samples/bpf/offwaketime_user.c | 67 +--------------------------------- 3 files changed, 69 insertions(+), 66 deletions(-) diff --git a/samples/bpf/bpf_load.c b/samples/bpf/bpf_load.c index 816bca5760a0..d16864293c00 100644 --- a/samples/bpf/bpf_load.c +++ b/samples/bpf/bpf_load.c @@ -346,3 +346,65 @@ void read_trace_pipe(void) } } } + +#define MAX_SYMS 300000 +static struct ksym syms[MAX_SYMS]; +static int sym_cnt; + +static int ksym_cmp(const void *p1, const void *p2) +{ + return ((struct ksym *)p1)->addr - ((struct ksym *)p2)->addr; +} + +int load_kallsyms(void) +{ + FILE *f = fopen("/proc/kallsyms", "r"); + char func[256], buf[256]; + char symbol; + void *addr; + int i = 0; + + if (!f) + return -ENOENT; + + while (!feof(f)) { + if (!fgets(buf, sizeof(buf), f)) + break; + if (sscanf(buf, "%p %c %s", &addr, &symbol, func) != 3) + break; + if (!addr) + continue; + syms[i].addr = (long) addr; + syms[i].name = strdup(func); + i++; + } + sym_cnt = i; + qsort(syms, sym_cnt, sizeof(struct ksym), ksym_cmp); + return 0; +} + +struct ksym *ksym_search(long key) +{ + int start = 0, end = sym_cnt; + int result; + + while (start < end) { + size_t mid = start + (end - start) / 2; + + result = key - syms[mid].addr; + if (result < 0) + end = mid; + else if (result > 0) + start = mid + 1; + else + return &syms[mid]; + } + + if (start >= 1 && syms[start - 1].addr < key && + key < syms[start].addr) + /* valid ksym */ + return &syms[start - 1]; + + /* out of range. return _stext */ + return &syms[0]; +} diff --git a/samples/bpf/bpf_load.h b/samples/bpf/bpf_load.h index cbd7c2b532b9..dfa57fe65c8e 100644 --- a/samples/bpf/bpf_load.h +++ b/samples/bpf/bpf_load.h @@ -23,5 +23,11 @@ extern int event_fd[MAX_PROGS]; int load_bpf_file(char *path); void read_trace_pipe(void); +struct ksym { + long addr; + char *name; +}; +int load_kallsyms(void); +struct ksym *ksym_search(long key); #endif diff --git a/samples/bpf/offwaketime_user.c b/samples/bpf/offwaketime_user.c index 17cf3024e22c..6f002a9c24fa 100644 --- a/samples/bpf/offwaketime_user.c +++ b/samples/bpf/offwaketime_user.c @@ -18,80 +18,15 @@ #include "libbpf.h" #include "bpf_load.h" -#define MAX_SYMS 300000 #define PRINT_RAW_ADDR 0 -static struct ksym { - long addr; - char *name; -} syms[MAX_SYMS]; -static int sym_cnt; - -static int ksym_cmp(const void *p1, const void *p2) -{ - return ((struct ksym *)p1)->addr - ((struct ksym *)p2)->addr; -} - -static int load_kallsyms(void) -{ - FILE *f = fopen("/proc/kallsyms", "r"); - char func[256], buf[256]; - char symbol; - void *addr; - int i = 0; - - if (!f) - return -ENOENT; - - while (!feof(f)) { - if (!fgets(buf, sizeof(buf), f)) - break; - if (sscanf(buf, "%p %c %s", &addr, &symbol, func) != 3) - break; - if (!addr) - continue; - syms[i].addr = (long) addr; - syms[i].name = strdup(func); - i++; - } - sym_cnt = i; - qsort(syms, sym_cnt, sizeof(struct ksym), ksym_cmp); - return 0; -} - -static void *search(long key) -{ - int start = 0, end = sym_cnt; - int result; - - while (start < end) { - size_t mid = start + (end - start) / 2; - - result = key - syms[mid].addr; - if (result < 0) - end = mid; - else if (result > 0) - start = mid + 1; - else - return &syms[mid]; - } - - if (start >= 1 && syms[start - 1].addr < key && - key < syms[start].addr) - /* valid ksym */ - return &syms[start - 1]; - - /* out of range. return _stext */ - return &syms[0]; -} - static void print_ksym(__u64 addr) { struct ksym *sym; if (!addr) return; - sym = search(addr); + sym = ksym_search(addr); if (PRINT_RAW_ADDR) printf("%s/%llx;", sym->name, addr); else -- 2.20.1