commit d276b7a9614987495a7dfb056e6558f452ebe802
author Arun Sharma <asharma@fb.com> Mon Mar 12 18:45:50 2012 -0700
committer Arun Sharma <asharma@fb.com> Mon Mar 12 20:09:18 2012 -0700
tree 2d4e21f59b26357ea5327cab69f75db79db67a31
parent 6525714c270c6521389b657793bd7147eeffa4f0

Introduce get_proc_name_in_image()

This is similar to get_proc_name() but takes an already mapped
image.

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>

src/elfxx.c

diff --git a/src/elfxx.c b/src/elfxx.c
index 68c303a..844cc1c 100644
--- a/src/elfxx.c
+++ b/src/elfxx.c
@@ -127,22 +127,19 @@
    sensitive to the performance of this routine, why bother...  */
 
 HIDDEN int
-elf_w (get_proc_name) (unw_addr_space_t as, pid_t pid, unw_word_t ip,
+elf_w (get_proc_name_in_image) (unw_addr_space_t as, struct elf_image *ei,
+		       unsigned long segbase,
+		       unsigned long mapoff,
+		       unw_word_t ip,
 		       char *buf, size_t buf_len, unw_word_t *offp)
 {
-  unsigned long segbase, mapoff;
   Elf_W (Addr) load_offset = 0;
-  struct elf_image ei;
   Elf_W (Ehdr) *ehdr;
   Elf_W (Phdr) *phdr;
   int i, ret;
 
-  ret = tdep_get_elf_image (&ei, pid, ip, &segbase, &mapoff, NULL, 0);
-  if (ret < 0)
-    return ret;
-
-  ehdr = ei.image;
-  phdr = (Elf_W (Phdr) *) ((char *) ei.image + ehdr->e_phoff);
+  ehdr = ei->image;
+  phdr = (Elf_W (Phdr) *) ((char *) ei->image + ehdr->e_phoff);
 
   for (i = 0; i < ehdr->e_phnum; ++i)
     if (phdr[i].p_type == PT_LOAD && phdr[i].p_offset == mapoff)
@@ -151,7 +148,24 @@
 	break;
       }
 
-  ret = elf_w (lookup_symbol) (as, ip, &ei, load_offset, buf, buf_len, offp);
+  ret = elf_w (lookup_symbol) (as, ip, ei, load_offset, buf, buf_len, offp);
+
+  return ret;
+}
+
+HIDDEN int
+elf_w (get_proc_name) (unw_addr_space_t as, pid_t pid, unw_word_t ip,
+		       char *buf, size_t buf_len, unw_word_t *offp)
+{
+  unsigned long segbase, mapoff;
+  struct elf_image ei;
+  int ret;
+
+  ret = tdep_get_elf_image (&ei, pid, ip, &segbase, &mapoff, NULL, 0);
+  if (ret < 0)
+    return ret;
+
+  ret = elf_w (get_proc_name_in_image) (as, &ei, segbase, mapoff, ip, buf, buf_len, offp);
 
   munmap (ei.image, ei.size);
   ei.image = NULL;

src/elfxx.h

diff --git a/src/elfxx.h b/src/elfxx.h
index f53eae7..dea0463 100644
--- a/src/elfxx.h
+++ b/src/elfxx.h
@@ -48,6 +48,18 @@
 				  char *buf, size_t len,
 				  unw_word_t *offp);
 
+extern int elf_w (get_proc_name_in_image) (unw_addr_space_t as,
+					   struct elf_image *ei,
+					   unsigned long segbase,
+					   unsigned long mapoff,
+					   unw_word_t ip,
+					   char *buf, size_t buf_len, unw_word_t *offp);
+
+extern int elf_w (get_proc_name) (unw_addr_space_t as,
+				  pid_t pid, unw_word_t ip,
+				  char *buf, size_t len,
+				  unw_word_t *offp);
+
 static inline int
 elf_w (valid_object) (struct elf_image *ei)
 {