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nixprof: Use sh_type insteaf of sh_name for section identification and use SHT_SYMTAB

This commit is contained in:
Gabriel Corona 2015-08-25 01:27:36 +02:00
parent a34a4d6f38
commit c87307162d
1 changed files with 30 additions and 14 deletions
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44
core/linux/nixprof/nixprof.cpp
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@ -131,23 +131,33 @@ static void elf_syms(FILE* out,const char* libfile)
int dynsym=-1; int dynsym=-1;
int dynstr=-1; int dynstr=-1;
int strtab=-1;
int symtab=-1;
/*
Section: 2 -> .dynsym
Section: 3 -> .dynstr
*/
if (elf_checkFile(data)>=0) if (elf_checkFile(data)>=0)
{ {
int scnt=elf_getNumSections(data); int scnt=elf_getNumSections(data);
for (int si=0;si<scnt;si++) for (int si=0;si<scnt;si++)
{ {
if (strcmp(".dynsym",elf_getSectionName(data,si))==0) uint32_t section_type = elf_getSectionType(data, si);
dynsym=si; uint64_t section_link = elf_getSectionLink(data, si);
switch (section_type) {
case SHT_DYNSYM:
if (strcmp(".dynstr",elf_getSectionName(data,si))==0) fprintf(stderr, "DYNSYM");
dynstr=si; dynsym = si;
if (section_link < scnt)
dynstr = section_link;
break;
case SHT_SYMTAB:
fprintf(stderr, "SYMTAB");
symtab = si;
if (section_link < scnt)
strtab = section_link;
break;
default:
break;;
}
} }
} }
else else
@ -155,10 +165,18 @@ static void elf_syms(FILE* out,const char* libfile)
printf("Invalid elf file\n"); printf("Invalid elf file\n");
} }
// Use SHT_SYMTAB if available insteaf of SHT_DYNSYM
// (there is more info here):
if (symtab >= 0 && strtab >= 0)
{
dynsym = symtab;
dynstr = strtab;
}
if (dynsym >= 0) if (dynsym >= 0)
{ {
prof_head(out,"libsym",libfile); prof_head(out,"libsym",libfile);
// printf("Found dymsym %d, and dynstr %d!\n",dynsym,dynstr); // printf("Found dymsym %d, and dynstr %d!\n",dynsym,dynstr);
elf_symbol* sym=(elf_symbol*)elf_getSection(data,dynsym); elf_symbol* sym=(elf_symbol*)elf_getSection(data,dynsym);
int symcnt=elf_getSectionSize(data,dynsym)/sizeof(elf_symbol); int symcnt=elf_getSectionSize(data,dynsym)/sizeof(elf_symbol);
@ -168,7 +186,7 @@ static void elf_syms(FILE* out,const char* libfile)
{ {
char* name=(char*)elf_getSection(data,dynstr);// sym[i].st_shndx char* name=(char*)elf_getSection(data,dynstr);// sym[i].st_shndx
// printf("Symbol %d: %s, %08X, %d bytes\n",i,name+sym[i].st_name,sym[i].st_value,sym[i].st_size); // printf("Symbol %d: %s, %08X, %d bytes\n",i,name+sym[i].st_name,sym[i].st_value,sym[i].st_size);
fprintf(out,"%08X %d %s\n",sym[i].st_value,sym[i].st_size,name+sym[i].st_name); fprintf(out,"%08X %d %s\n",sym[i].st_value,sym[i].st_size,name+sym[i].st_name);
} }
} }
@ -182,8 +200,6 @@ static void elf_syms(FILE* out,const char* libfile)
} }
} }
static volatile bool prof_run; static volatile bool prof_run;
// This is not used: // This is not used: