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| author | Tom Tromey <tom@tromey.com> | 2016-08-22 16:56:52 -0600 |
|---|---|---|
| committer | Tom Tromey <tom@tromey.com> | 2016-09-02 11:33:00 -0600 |
| commit | 4aa4e28bdcf5f0d733def62b542fea11d5f219d5 (patch) | |
| tree | 3a5f878a8dd275ea370cf6e8172f8ed7f92accd1 /gdb/compile | |
| parent | 1b2d85b255f11d0fce6c323f9e113673445c961a (diff) | |
Handle DW_OP_form_tls_address
Currently gdb supports DW_OP_GNU_push_tls_address, but not
DW_OP_form_tls_address. I think it would be better if the toolchain
as a whole moved to using the standard opcode, and the prerequisite to
this is getting gdb to recognize it.
GCC can sometimes emit DW_OP_form_tls_address for emultls targets. As
far as I know, nobody has ever tried this with gdb (since it wouldn't
work at all).
I don't think there's a major drawback to using a single opcode for
all targets, because computing the location of a thread-local is
already target specific.
This is PR gdb/11616.
I don't know how to write a test case for this; though it's worth
noting that there aren't explicit tests for DW_OP_GNU_push_tls_address
either -- and if I change GCC, these paths will be tested to the same
extent they are now.
2016-09-02 Tom Tromey <tom@tromey.com>
PR gdb/11616:
* dwarf2read.c (decode_locdesc): Handle DW_OP_form_tls_address.
* dwarf2loc.c (dwarf2_compile_expr_to_ax): Handle
DW_OP_form_tls_address.
(locexpr_describe_location_piece): Likewise.
* dwarf2expr.h (struct dwarf_expr_context_funcs): Update comment.
* dwarf2expr.c (execute_stack_op): Handle DW_OP_form_tls_address.
(ctx_no_get_tls_address): Mention DW_OP_form_tls_address.
* compile/compile-loc2c.c (struct insn_info): Update comment.
(compute_stack_depth_worker): Handle DW_OP_form_tls_address.
Diffstat (limited to 'gdb/compile')
| -rw-r--r-- | gdb/compile/compile-loc2c.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/gdb/compile/compile-loc2c.c b/gdb/compile/compile-loc2c.c index 1a267b8523..e8bef55e04 100644 --- a/gdb/compile/compile-loc2c.c +++ b/gdb/compile/compile-loc2c.c @@ -48,9 +48,9 @@ struct insn_info unsigned int label : 1; - /* Whether this instruction is DW_OP_GNU_push_tls_address. This is - a hack until we can add a feature to glibc to let us properly - generate code for TLS. */ + /* Whether this instruction is DW_OP_GNU_push_tls_address or + DW_OP_form_tls_address. This is a hack until we can add a + feature to glibc to let us properly generate code for TLS. */ unsigned int is_tls : 1; }; @@ -323,6 +323,7 @@ compute_stack_depth_worker (int start, int *need_tempvar, break; case DW_OP_GNU_push_tls_address: + case DW_OP_form_tls_address: info[ndx].is_tls = 1; break; |