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hack to find first instruction for decoding the pc/line table properly.

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SVN=122792
This commit is contained in:
Rob Pike 2008-06-13 18:15:30 -07:00
parent 34691ccd10
commit 1ad1044b2d
1 changed files with 10 additions and 1 deletions
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9
src/libmach_amd64/sym.c
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@ -83,6 +83,7 @@ static Sym *symbols; /* symbol table */
static Txtsym *txt; /* Base of text symbol table */
static uvlong txtstart; /* start of text segment */
static uvlong txtend; /* end of text segment */
static uvlong firstinstr; /* as found from symtab; needed for amd64 */
static void cleansyms(void);
static long decodename(Biobuf*, Sym*);
@ -385,6 +386,7 @@ buildtbls(void)
return 1;
isbuilt = 1;
/* allocate the tables */
firstinstr = 0;
if(nglob) {
globals = malloc(nglob*sizeof(*globals));
if(!globals) {
@ -428,6 +430,7 @@ buildtbls(void)
hp = hist;
ap = autos;
for(p = symbols; i-- > 0; p++) {
//print("sym %d type %c name %s value %llux\n", p-symbols, p->type, p->name, p->value);
switch(p->type) {
case 'D':
case 'd':
@ -474,6 +477,8 @@ buildtbls(void)
tp->locals = ap;
if(debug)
print("TEXT: %s at %llux\n", p->name, p->value);
if (firstinstr == 0 || p->value < firstinstr)
firstinstr = p->value;
if(f && !f->sym) { /* first */
f->sym = p;
f->addr = p->value;
@ -1045,6 +1050,7 @@ fileline(char *str, int n, uvlong dot)
bot = mid;
else {
line = pc2line(dot);
print("line %d\n", line);
if(line > 0 && fline(str, n, line, f->hist, 0) >= 0)
return 1;
break;
@ -1269,6 +1275,9 @@ pc2line(uvlong pc)
if(pcline == 0)
return -1;
currline = 0;
if (firstinstr != 0)
currpc = firstinstr-mach->pcquant;
else
currpc = txtstart-mach->pcquant;
if(pc<currpc || pc>txtend)
return ~0;