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[68]l: fix off by one instruction in dwarf frame unwinding.

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R=rsc
CC=golang-dev
https://golang.org/cl/2543043
This commit is contained in:
Luuk van Dijk 2010-10-17 21:13:55 +02:00
parent 8abb8e1d20
commit cc9e6b5cdb
1 changed files with 10 additions and 14 deletions
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24
src/cmd/ld/dwarf.c
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@ -747,10 +747,11 @@ writelines(void)
diag("reachable code before seeing any history: %P", p);
continue;
}
dwinfo->child = newdie(dwinfo->child, DW_ABRV_FUNCTION);
newattr(dwinfo->child, DW_AT_name, DW_CLS_STRING, strlen(s->name), s->name);
newattr(dwinfo->child, DW_AT_low_pc, DW_CLS_ADDRESS, p->pc, 0);
newattr(dwinfo->child, DW_AT_low_pc, DW_CLS_ADDRESS, s->text->pc, 0);
newattr(dwinfo->child, DW_AT_high_pc, DW_CLS_ADDRESS, s->text->pc + s->size, 0);
for(q = p; q != P && (q == p || q->as != ATEXT); q = q->link) {
epc = q->pc;
@ -780,9 +781,6 @@ writelines(void)
lc = q->line;
llc = lline;
}
newattr(dwinfo->child, DW_AT_high_pc, DW_CLS_ADDRESS, epc+1, 0);
}
flushunit(epc, unitstart);
@ -795,8 +793,8 @@ writelines(void)
enum
{
CIERESERVE = 16,
DATAALIGNMENTFACTOR = -4,
FAKERETURNCOLUMN = 16
DATAALIGNMENTFACTOR = -4, // TODO -PtrSize?
FAKERETURNCOLUMN = 16 // TODO gdb6 doesnt like > 15?
};
static void
@ -824,7 +822,7 @@ writeframes(void)
{
Prog *p, *q;
Sym *s;
vlong fdeo, fdesize, pad, cfa, pc, epc;
vlong fdeo, fdesize, pad, cfa, pc;
frameo = cpos();
@ -867,16 +865,14 @@ writeframes(void)
cfa = PtrSize; // CFA starts at sp+PtrSize
p = s->text;
pc = p->pc;
epc = p->pc;
for(q = p; q != P; q = q->link) {
epc = q->pc;
for(q = p; q->link != P; q = q->link) {
if (q->spadj == 0)
continue;
cfa += q->spadj;
putpccfadelta(q->pc - pc, cfa);
pc = q->pc;
putpccfadelta(q->link->pc - pc, cfa);
pc = q->link->pc;
}
fdesize = cpos() - fdeo - 4; // exclude the length field.
@ -890,7 +886,7 @@ writeframes(void)
LPUT(fdesize);
LPUT(0);
addrput(p->pc);
addrput(epc - p->pc);
addrput(s->size);
cflush();
seek(cout, fdeo + 4 + fdesize, 0);