diff options
Diffstat (limited to 'gdb/dbxread.c')
| -rw-r--r-- | gdb/dbxread.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/gdb/dbxread.c b/gdb/dbxread.c index dde922a..115bdef 100644 --- a/gdb/dbxread.c +++ b/gdb/dbxread.c @@ -2597,6 +2597,19 @@ read_ofile_symtab (struct partial_symtab *pst) if (type & N_STAB) { + if (sizeof (nlist.n_value) > 4 + /* We are a 64-bit debugger debugging a 32-bit program. */ + && (type == N_LSYM || type == N_PSYM)) + /* We have to be careful with the n_value in the case of N_LSYM + and N_PSYM entries, because they are signed offsets from frame + pointer, but we actually read them as unsigned 32-bit values. + This is not a problem for 32-bit debuggers, for which negative + values end up being interpreted correctly (as negative + offsets) due to integer overflow. + But we need to sign-extend the value for 64-bit debuggers, + or we'll end up interpreting negative values as very large + positive offsets. */ + nlist.n_value = (nlist.n_value ^ 0x80000000) - 0x80000000; process_one_symbol (type, nlist.n_desc, nlist.n_value, namestring, section_offsets, objfile); } |