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/* scfidw2gen.c - Support for emission of synthesized Dwarf2 CFI.
Copyright (C) 2023-2025 Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
GAS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GAS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GAS; see the file COPYING. If not, write to the Free
Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
02110-1301, USA. */
#include "as.h"
#include "ginsn.h"
#include "scfi.h"
#include "dw2gencfi.h"
#include "subsegs.h"
#include "scfidw2gen.h"
#if defined (TARGET_USE_SCFI) && defined (TARGET_USE_GINSN)
static bool scfi_ignore_warn_once;
static void
dot_scfi_ignore (int ignored ATTRIBUTE_UNUSED)
{
gas_assert (flag_synth_cfi);
if (!scfi_ignore_warn_once)
{
as_warn (_("SCFI ignores most user-specified CFI directives"));
scfi_ignore_warn_once = true;
}
ignore_rest_of_line ();
}
static void
scfi_process_cfi_label (void)
{
char *name;
ginsnS *ginsn;
name = read_symbol_name ();
if (name == NULL)
return;
/* Add a new ginsn. */
ginsn = ginsn_new_phantom (symbol_temp_new_now ());
frch_ginsn_data_append (ginsn);
scfi_op_add_cfi_label (ginsn, name);
/* NB: Can't free NAME here since it will be used later. Free it in
handle_scfi_dot_cfi after it is unused. */
demand_empty_rest_of_line ();
}
static void
scfi_process_cfi_signal_frame (void)
{
ginsnS *ginsn;
ginsn = ginsn_new_phantom (symbol_temp_new_now ());
frch_ginsn_data_append (ginsn);
scfi_op_add_signal_frame (ginsn);
}
static void
dot_scfi (int arg)
{
switch (arg)
{
case CFI_label:
scfi_process_cfi_label ();
break;
case CFI_signal_frame:
scfi_process_cfi_signal_frame ();
break;
default:
abort ();
}
}
const pseudo_typeS scfi_pseudo_table[] =
{
{ "cfi_sections", dot_cfi_sections, 0 }, /* No ignore. */
{ "cfi_signal_frame", dot_scfi, CFI_signal_frame }, /* No ignore. */
{ "cfi_label", dot_scfi, CFI_label }, /* No ignore. */
{ "cfi_startproc", dot_scfi_ignore, 0 },
{ "cfi_endproc", dot_scfi_ignore, 0 },
{ "cfi_fde_data", dot_scfi_ignore, 0 },
{ "cfi_def_cfa", dot_scfi_ignore, 0 },
{ "cfi_def_cfa_register", dot_scfi_ignore, 0 },
{ "cfi_def_cfa_offset", dot_scfi_ignore, 0 },
{ "cfi_adjust_cfa_offset", dot_scfi_ignore, 0 },
{ "cfi_offset", dot_scfi_ignore, 0 },
{ "cfi_rel_offset", dot_scfi_ignore, 0 },
{ "cfi_register", dot_scfi_ignore, 0 },
{ "cfi_return_column", dot_scfi_ignore, 0 },
{ "cfi_restore", dot_scfi_ignore, 0 },
{ "cfi_undefined", dot_scfi_ignore, 0 },
{ "cfi_same_value", dot_scfi_ignore, 0 },
{ "cfi_remember_state", dot_scfi_ignore, 0 },
{ "cfi_restore_state", dot_scfi_ignore, 0 },
{ "cfi_window_save", dot_scfi_ignore, 0 },
{ "cfi_negate_ra_state", dot_scfi_ignore, 0 },
{ "cfi_negate_ra_state_with_pc", dot_scfi_ignore, 0 },
{ "cfi_escape", dot_scfi_ignore, 0 },
{ "cfi_personality", dot_scfi_ignore, 0 },
{ "cfi_personality_id", dot_scfi_ignore, 0 },
{ "cfi_lsda", dot_scfi_ignore, 0 },
{ "cfi_val_encoded_addr", dot_scfi_ignore, 0 },
{ "cfi_inline_lsda", dot_scfi_ignore, 0 },
{ "cfi_val_offset", dot_scfi_ignore, 0 },
{ NULL, NULL, 0 }
};
void
scfi_dot_cfi_startproc (const symbolS *start_sym)
{
if (frchain_now->frch_cfi_data != NULL)
{
as_bad (_("SCFI: missing previous SCFI endproc marker"));
return;
}
cfi_new_fde ((symbolS *)start_sym, false);
cfi_set_sections ();
frchain_now->frch_cfi_data->cur_cfa_offset = 0;
/* By default, SCFI machinery assumes .cfi_startproc is used without
parameter simple. */
tc_cfi_frame_initial_instructions ();
if ((all_cfi_sections & CFI_EMIT_target) != 0)
tc_cfi_startproc ();
}
void
scfi_dot_cfi_endproc (const symbolS *end_sym)
{
struct fde_entry *fde_last;
if (frchain_now->frch_cfi_data == NULL)
{
as_bad (_(".cfi_endproc without corresponding .cfi_startproc"));
return;
}
fde_last = frchain_now->frch_cfi_data->cur_fde_data;
cfi_set_last_fde (fde_last);
cfi_end_fde ((symbolS *)end_sym);
if ((all_cfi_sections & CFI_EMIT_target) != 0)
tc_cfi_endproc (fde_last);
}
void
scfi_dot_cfi (int arg, unsigned reg1, unsigned reg2, offsetT offset,
const char *name, const symbolS *advloc)
{
if (frchain_now->frch_cfi_data == NULL)
{
as_bad (_("CFI instruction used without previous .cfi_startproc"));
return;
}
/* If the last address was not at the current PC, advance to current. */
if (frchain_now->frch_cfi_data->last_address != advloc)
cfi_add_advance_loc ((symbolS *)advloc);
switch (arg)
{
case DW_CFA_offset:
cfi_add_CFA_offset (reg1, offset);
break;
case DW_CFA_val_offset:
cfi_add_CFA_val_offset (reg1, offset);
break;
case CFI_rel_offset:
cfi_add_CFA_offset (reg1,
offset - frchain_now->frch_cfi_data->cur_cfa_offset);
break;
case DW_CFA_def_cfa:
cfi_add_CFA_def_cfa (reg1, offset);
break;
case DW_CFA_register:
cfi_add_CFA_register (reg1, reg2);
break;
case DW_CFA_def_cfa_register:
cfi_add_CFA_def_cfa_register (reg1);
break;
case DW_CFA_def_cfa_offset:
cfi_add_CFA_def_cfa_offset (offset);
break;
case CFI_adjust_cfa_offset:
cfi_add_CFA_def_cfa_offset (frchain_now->frch_cfi_data->cur_cfa_offset
+ offset);
break;
case DW_CFA_restore:
cfi_add_CFA_restore (reg1);
break;
case DW_CFA_remember_state:
cfi_add_CFA_remember_state ();
break;
case DW_CFA_restore_state:
cfi_add_CFA_restore_state ();
break;
case CFI_label:
cfi_add_label (name);
break;
case CFI_signal_frame:
frchain_now->frch_cfi_data->cur_fde_data->signal_frame = 1;
break;
/*
case DW_CFA_undefined:
for (;;)
{
reg1 = cfi_parse_reg ();
cfi_add_CFA_undefined (reg1);
SKIP_WHITESPACE ();
if (*input_line_pointer != ',')
break;
++input_line_pointer;
}
break;
case DW_CFA_same_value:
reg1 = cfi_parse_reg ();
cfi_add_CFA_same_value (reg1);
break;
case CFI_return_column:
reg1 = cfi_parse_reg ();
cfi_set_return_column (reg1);
break;
case DW_CFA_GNU_window_save:
cfi_add_CFA_insn (DW_CFA_GNU_window_save);
break;
*/
default:
abort ();
}
}
#endif
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