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gdb: Add guess_tracepoint_registers hook to gdbarch.

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When we're looking at a tracefile trace frame where registers are not
available, and the tracepoint has only one location, we supply
the location's address as the PC register.  However, this only works
if PC is not a pseudo register, and individual architectures may want
to guess more registers.  Add a gdbarch hook that will handle that.

gdb/ChangeLog:

	* arch-utils.c (default_guess_tracepoint_registers): New function.
	* arch-utils.h (default_guess_tracepoint_registers): New prototype.
	* gdbarch.c: Regenerate.
	* gdbarch.h: Regenerate.
	* gdbarch.sh: Add guess_tracepoint_registers hook.
	* tracefile.c (tracefile_fetch_registers): Use the new gdbarch hook.
This commit is contained in:
Marcin Kościelnicki
2016-02-18 09:21:38 +01:00
parent c304e18e5c
commit 5f034a78b9
7 changed files with 95 additions and 39 deletions
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23
gdb/gdbarch.c
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@ -312,6 +312,7 @@ struct gdbarch
int has_global_breakpoints;
gdbarch_has_shared_address_space_ftype *has_shared_address_space;
gdbarch_fast_tracepoint_valid_at_ftype *fast_tracepoint_valid_at;
gdbarch_guess_tracepoint_registers_ftype *guess_tracepoint_registers;
gdbarch_auto_charset_ftype *auto_charset;
gdbarch_auto_wide_charset_ftype *auto_wide_charset;
const char * solib_symbols_extension;
@ -419,6 +420,7 @@ gdbarch_alloc (const struct gdbarch_info *info,
gdbarch->relocate_instruction = NULL;
gdbarch->has_shared_address_space = default_has_shared_address_space;
gdbarch->fast_tracepoint_valid_at = default_fast_tracepoint_valid_at;
gdbarch->guess_tracepoint_registers = default_guess_tracepoint_registers;
gdbarch->auto_charset = default_auto_charset;
gdbarch->auto_wide_charset = default_auto_wide_charset;
gdbarch->gen_return_address = default_gen_return_address;
@ -658,6 +660,7 @@ verify_gdbarch (struct gdbarch *gdbarch)
/* Skip verify of has_global_breakpoints, invalid_p == 0 */
/* Skip verify of has_shared_address_space, invalid_p == 0 */
/* Skip verify of fast_tracepoint_valid_at, invalid_p == 0 */
/* Skip verify of guess_tracepoint_registers, invalid_p == 0 */
/* Skip verify of auto_charset, invalid_p == 0 */
/* Skip verify of auto_wide_charset, invalid_p == 0 */
/* Skip verify of has_dos_based_file_system, invalid_p == 0 */
@ -1023,6 +1026,9 @@ gdbarch_dump (struct gdbarch *gdbarch, struct ui_file *file)
fprintf_unfiltered (file,
"gdbarch_dump: gnu_triplet_regexp = <%s>\n",
host_address_to_string (gdbarch->gnu_triplet_regexp));
fprintf_unfiltered (file,
"gdbarch_dump: guess_tracepoint_registers = <%s>\n",
host_address_to_string (gdbarch->guess_tracepoint_registers));
fprintf_unfiltered (file,
"gdbarch_dump: half_bit = %s\n",
plongest (gdbarch->half_bit));
@ -4450,6 +4456,23 @@ set_gdbarch_fast_tracepoint_valid_at (struct gdbarch *gdbarch,
gdbarch->fast_tracepoint_valid_at = fast_tracepoint_valid_at;
}
void
gdbarch_guess_tracepoint_registers (struct gdbarch *gdbarch, struct regcache *regcache, CORE_ADDR addr)
{
gdb_assert (gdbarch != NULL);
gdb_assert (gdbarch->guess_tracepoint_registers != NULL);
if (gdbarch_debug >= 2)
fprintf_unfiltered (gdb_stdlog, "gdbarch_guess_tracepoint_registers called\n");
gdbarch->guess_tracepoint_registers (gdbarch, regcache, addr);
}
void
set_gdbarch_guess_tracepoint_registers (struct gdbarch *gdbarch,
gdbarch_guess_tracepoint_registers_ftype guess_tracepoint_registers)
{
gdbarch->guess_tracepoint_registers = guess_tracepoint_registers;
}
const char *
gdbarch_auto_charset (struct gdbarch *gdbarch)
{