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samples/bpf: move ksym_search() into library

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move ksym search from offwaketime into library to be reused
in other tests

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexei Starovoitov 2016-03-07 21:57:19 -08:00 committed by David S. Miller
parent 618ec9a7b1
commit 3622e7e493
3 changed files with 69 additions and 66 deletions
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62
samples/bpf/bpf_load.c
View file

@ -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];
}

6
samples/bpf/bpf_load.h
View file

@ -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

67
samples/bpf/offwaketime_user.c
View file

@ -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