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On Sat, Dec 13, 2008 at 8:01 AM, Joel Brobecker <brobecker@adacore.com> wrote: > > - leave GDB broken and wait for newer glibc :( > > I'm just realizing that this might be a very very visible problem, > if most offsets are negative. Is that the case? Now that you've mentioned it, I see that there is a trivial test case: int bar(int x) { return x; } int foo(int x) { int y = x; return bar(y); } int main() { return foo(0); } gcc -gstabs -m32 t.c && gdb64 -q ./a.out (gdb) b bar Breakpoint 1 at 0x8048303: file t.c, line 1. (gdb) r Breakpoint 1, bar (x=0) at t.c:1 1 int bar(int x) { return x; } (gdb) up #1 0x0804831f in foo (x=0) at t.c:2 2 int foo(int x) { int y = x; return bar(y); } (gdb) info locals y = Cannot access memory at address 0xffffd954 > > - do sign extension, but only for N_LSYM and N_PSYM symbols as > > a heuristic. > > It seems to me that this should work without negative effect > (we have to be a little careful because there is a 64bit stabs > extension on Tru64). AFAICT, Tru64 goes through ECOFF reader in mdebugread.c, and so wouldn't be affected by a change to dbxread.c > After all, values for these types of symbols > are always offsets to some location inside a frame, and I can't see > a frame being that big. Especially in a 32-bit executable ... > > - pre-scan the objfile to determine highest link address, and > > do sign extension if that address is (well) below 0x80000000 > > Seems too much work, IMO. Right. So here is a 3rd attempt. Thanks, -- Paul Pluzhnikov 2008-12-12 Paul Pluzhnikov <ppluzhnikov@google.com> * dbxread.c (read_ofile_symtab): Sign-extend 32-bit N_LSYM and N_PSYM STABS values for 64-bit GDB.
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