/* dw2gencfi.c - Support for generating Dwarf2 CFI information.
- Copyright (C) 2003-2018 Free Software Foundation, Inc.
+ Copyright (C) 2003-2021 Free Software Foundation, Inc.
Contributed by Michal Ludvig <mludvig@suse.cz>
This file is part of GAS, the GNU Assembler.
};
#ifdef SUPPORT_COMPACT_EH
-static bfd_boolean compact_eh;
+static bool compact_eh;
#else
#define compact_eh 0
#endif
-static struct hash_control *dwcfi_hash;
+static htab_t dwcfi_hash;
\f
/* Emit a single byte into the current segment. */
emit a byte containing ENCODING. */
static void
-emit_expr_encoded (expressionS *exp, int encoding, bfd_boolean emit_encoding)
+emit_expr_encoded (expressionS *exp, int encoding, bool emit_encoding)
{
unsigned int size = encoding_size (encoding);
bfd_reloc_code_real_type code;
static char *
get_debugseg_name (segT seg, const char *base_name)
{
- const char *name;
+ const char * name;
+ const char * dollar;
+ const char * dot;
if (!seg)
- name = "";
- else
- {
- const char * dollar;
- const char * dot;
+ return concat (base_name, NULL);
- name = bfd_get_section_name (stdoutput, seg);
+ name = bfd_section_name (seg);
- dollar = strchr (name, '$');
- dot = strchr (name + 1, '.');
+ if (name == NULL || *name == 0)
+ return concat (base_name, NULL);
+
+ dollar = strchr (name, '$');
+ dot = strchr (name + 1, '.');
- if (!dollar && !dot)
- {
- if (!strcmp (base_name, ".eh_frame_entry")
- && strcmp (name, ".text") != 0)
- return concat (base_name, ".", name, NULL);
+ if (!dollar && !dot)
+ {
+ if (!strcmp (base_name, ".eh_frame_entry")
+ && strcmp (name, ".text") != 0)
+ return concat (base_name, ".", name, NULL);
- name = "";
- }
- else if (!dollar)
- name = dot;
- else if (!dot)
- name = dollar;
- else if (dot < dollar)
- name = dot;
- else
- name = dollar;
+ name = "";
}
+ else if (!dollar)
+ name = dot;
+ else if (!dot)
+ name = dollar;
+ else if (dot < dollar)
+ name = dot;
+ else
+ name = dollar;
return concat (base_name, name, NULL);
}
if (compact_eh)
return now_seg;
- if ((bfd_get_section_flags (stdoutput, now_seg)
+ if ((bfd_section_flags (now_seg)
& (SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD
| SEC_LINK_DUPLICATES_ONE_ONLY | SEC_LINK_DUPLICATES_SAME_SIZE
| SEC_LINK_DUPLICATES_SAME_CONTENTS)) != 0)
if (!cseg)
flags = 0;
else
- flags = bfd_get_section_flags (stdoutput, cseg)
- & (SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD
- | SEC_LINK_DUPLICATES_ONE_ONLY | SEC_LINK_DUPLICATES_SAME_SIZE
- | SEC_LINK_DUPLICATES_SAME_CONTENTS);
+ flags = (bfd_section_flags (cseg)
+ & (SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD
+ | SEC_LINK_DUPLICATES_ONE_ONLY | SEC_LINK_DUPLICATES_SAME_SIZE
+ | SEC_LINK_DUPLICATES_SAME_CONTENTS));
/* Add standard section flags. */
flags |= sflags;
/* Apply possibly linked once flags to new generated segment, too. */
- if (!bfd_set_section_flags (stdoutput, r, flags))
+ if (!bfd_set_section_flags (r, flags))
as_bad (_("bfd_set_section_flags: %s"),
bfd_errmsg (bfd_get_error ()));
return r;
}
-static void
-dwcfi_hash_insert (const char *name, struct dwcfi_seg_list *item)
-{
- const char *error_string;
-
- if ((error_string = hash_jam (dwcfi_hash, name, (char *) item)))
- as_fatal (_("Inserting \"%s\" into structure table failed: %s"),
- name, error_string);
-}
-
static struct dwcfi_seg_list *
dwcfi_hash_find (char *name)
{
- return (struct dwcfi_seg_list *) hash_find (dwcfi_hash, name);
+ return (struct dwcfi_seg_list *) str_hash_find (dwcfi_hash, name);
}
static struct dwcfi_seg_list *
/* Initialize dwcfi_hash once. */
if (!dwcfi_hash)
- dwcfi_hash = hash_new ();
+ dwcfi_hash = str_htab_create ();
name = get_debugseg_name (cseg, base_name);
{
item = alloc_debugseg_item (make_debug_seg (cseg, name, flags), 0, name);
- dwcfi_hash_insert (item->seg_name, item);
+ str_hash_insert (dwcfi_hash, item->seg_name, item, 0);
}
else
free (name);
unsigned char per_encoding;
unsigned char lsda_encoding;
expressionS personality;
- enum pointer_auth_key pauth_key;
+#ifdef tc_cie_entry_extras
+ tc_cie_entry_extras
+#endif
struct cfi_insn_data *first, *last;
};
fde->per_encoding = DW_EH_PE_omit;
fde->lsda_encoding = DW_EH_PE_omit;
fde->eh_header_type = EH_COMPACT_UNKNOWN;
- fde->pauth_key = AARCH64_PAUTH_KEY_A;
+#ifdef tc_fde_entry_init_extra
+ tc_fde_entry_init_extra (fde)
+#endif
return fde;
}
/* Construct a new INSN structure and add it to the end of the insn list
for the currently active FDE. */
-static bfd_boolean cfi_sections_set = FALSE;
+static bool cfi_sections_set = false;
static int cfi_sections = CFI_EMIT_eh_frame;
int all_cfi_sections = 0;
static struct fde_entry *last_fde;
cfi_set_sections (void)
{
frchain_now->frch_cfi_data->cur_fde_data->sections = all_cfi_sections;
- cfi_sections_set = TRUE;
+ cfi_sections_set = true;
}
/* Universal functions to store new instructions. */
{ "cfi_remember_state", dot_cfi, DW_CFA_remember_state },
{ "cfi_restore_state", dot_cfi, DW_CFA_restore_state },
{ "cfi_window_save", dot_cfi, DW_CFA_GNU_window_save },
+ { "cfi_negate_ra_state", dot_cfi, DW_CFA_AARCH64_negate_ra_state },
{ "cfi_escape", dot_cfi_escape, 0 },
{ "cfi_signal_frame", dot_cfi, CFI_signal_frame },
{ "cfi_personality", dot_cfi_personality, 0 },
saved_ilp = input_line_pointer;
c = get_symbol_name (& name);
- if (strncmp (name, ".eh_frame", sizeof ".eh_frame") == 0
+ if (startswith (name, ".eh_frame")
&& name[9] != '_')
sections |= CFI_EMIT_eh_frame;
- else if (strncmp (name, ".debug_frame", sizeof ".debug_frame") == 0)
+ else if (startswith (name, ".debug_frame"))
sections |= CFI_EMIT_debug_frame;
#if SUPPORT_COMPACT_EH
- else if (strncmp (name, ".eh_frame_entry",
- sizeof ".eh_frame_entry") == 0)
+ else if (startswith (name, ".eh_frame_entry"))
{
- compact_eh = TRUE;
+ compact_eh = true;
sections |= CFI_EMIT_eh_frame_compact;
}
#endif
}
demand_empty_rest_of_line ();
- cfi_sections_set = TRUE;
+ cfi_sections_set = true;
all_cfi_sections |= cfi_sections;
cfi_set_sections ();
frchain_now->frch_cfi_data->cur_cfa_offset = 0;
demand_empty_rest_of_line ();
- cfi_sections_set = TRUE;
+ cfi_sections_set = true;
if ((cfi_sections & CFI_EMIT_target) != 0)
tc_cfi_endproc (last_fde);
}
else
{
cseg = subseg_new (base, 0);
- bfd_set_section_flags (stdoutput, cseg, flags);
+ bfd_set_section_flags (cseg, flags);
}
record_alignment (cseg, align);
return cseg;
last_fde = frchain_now->frch_cfi_data->cur_fde_data;
- cfi_sections_set = TRUE;
+ cfi_sections_set = true;
if ((cfi_sections & CFI_EMIT_target) != 0
|| (cfi_sections & CFI_EMIT_eh_frame_compact) != 0)
{
else if (fde->per_encoding != DW_EH_PE_omit)
{
*p = 0;
- emit_expr_encoded (&fde->personality, fde->per_encoding, FALSE);
+ emit_expr_encoded (&fde->personality, fde->per_encoding, false);
data_size += encoding_size (fde->per_encoding);
}
else
addressT delta = S_GET_VALUE (to) - S_GET_VALUE (from);
addressT scaled = delta / DWARF2_LINE_MIN_INSN_LENGTH;
- if (scaled <= 0x3F)
+ if (scaled == 0)
+ ;
+ else if (scaled <= 0x3F)
out_one (DW_CFA_advance_loc + scaled);
else if (scaled <= 0xFF)
{
/* The code in ehopt.c expects that one byte of the encoding
is already allocated to the frag. This comes from the way
that it scans the .eh_frame section looking first for the
- .byte DW_CFA_advance_loc4. */
+ .byte DW_CFA_advance_loc4. Call frag_grow with the sum of
+ room needed by frag_more and frag_var to preallocate space
+ ensuring that the DW_CFA_advance_loc4 is in the fixed part
+ of the rs_cfa frag, so that the relax machinery can remove
+ the advance_loc should it advance by zero. */
+ frag_grow (5);
*frag_more (1) = DW_CFA_advance_loc4;
frag_var (rs_cfa, 4, 0, DWARF2_LINE_MIN_INSN_LENGTH << 3,
}
static void
-output_cie (struct cie_entry *cie, bfd_boolean eh_frame, int align)
+output_cie (struct cie_entry *cie, bool eh_frame, int align)
{
symbolS *after_size_address, *end_address;
expressionS exp;
if (fmt != dwarf2_format_32bit)
out_four (-1);
}
- out_one (DW_CIE_VERSION); /* Version. */
+ out_one (flag_dwarf_cie_version); /* Version. */
if (eh_frame)
{
out_one ('z'); /* Augmentation. */
if (cie->lsda_encoding != DW_EH_PE_omit)
out_one ('L');
out_one ('R');
- if (cie->pauth_key == AARCH64_PAUTH_KEY_B)
- out_one ('B');
+#ifdef tc_output_cie_extra
+ tc_output_cie_extra (cie);
+#endif
}
if (cie->signal_frame)
out_one ('S');
out_one (0);
+ if (flag_dwarf_cie_version >= 4)
+ {
+ /* For now we are assuming a flat address space with 4 or 8 byte
+ addresses. */
+ int address_size = dwarf2_format_32bit ? 4 : 8;
+ out_one (address_size); /* Address size. */
+ out_one (0); /* Segment size. */
+ }
out_uleb128 (DWARF2_LINE_MIN_INSN_LENGTH); /* Code alignment. */
out_sleb128 (DWARF2_CIE_DATA_ALIGNMENT); /* Data alignment. */
- if (DW_CIE_VERSION == 1) /* Return column. */
- out_one (cie->return_column);
+ if (flag_dwarf_cie_version == 1) /* Return column. */
+ {
+ if ((cie->return_column & 0xff) != cie->return_column)
+ as_bad (_("return column number %d overflows in CIE version 1"),
+ cie->return_column);
+ out_one (cie->return_column);
+ }
else
out_uleb128 (cie->return_column);
if (eh_frame)
augmentation_size += 1 + encoding_size (cie->per_encoding);
out_uleb128 (augmentation_size); /* Augmentation size. */
- emit_expr_encoded (&cie->personality, cie->per_encoding, TRUE);
+ emit_expr_encoded (&cie->personality, cie->per_encoding, true);
if (cie->lsda_encoding != DW_EH_PE_omit)
out_one (cie->lsda_encoding);
static void
output_fde (struct fde_entry *fde, struct cie_entry *cie,
- bfd_boolean eh_frame, struct cfi_insn_data *first,
+ bool eh_frame, struct cfi_insn_data *first,
int align)
{
symbolS *after_size_address, *end_address;
if (eh_frame)
out_uleb128 (augmentation_size); /* Augmentation size. */
- emit_expr_encoded (&fde->lsda, cie->lsda_encoding, FALSE);
+ emit_expr_encoded (&fde->lsda, cie->lsda_encoding, false);
for (; first; first = first->next)
if (CUR_SEG (first) == CUR_SEG (fde))
symbol_set_value_now (end_address);
}
+/* Allow these insns to be put in the initial sequence of a CIE.
+ If J is non-NULL, then compare I and J insns for a match. */
+
+static inline bool
+initial_cie_insn (const struct cfi_insn_data *i, const struct cfi_insn_data *j)
+{
+ if (j && i->insn != j->insn)
+ return false;
+ switch (i->insn)
+ {
+ case DW_CFA_offset:
+ case DW_CFA_def_cfa:
+ case DW_CFA_val_offset:
+ if (j)
+ {
+ if (i->u.ri.reg != j->u.ri.reg)
+ return false;
+ if (i->u.ri.offset != j->u.ri.offset)
+ return false;
+ }
+ break;
+
+ case DW_CFA_register:
+ if (j)
+ {
+ if (i->u.rr.reg1 != j->u.rr.reg1)
+ return false;
+ if (i->u.rr.reg2 != j->u.rr.reg2)
+ return false;
+ }
+ break;
+
+ case DW_CFA_def_cfa_register:
+ case DW_CFA_restore:
+ case DW_CFA_undefined:
+ case DW_CFA_same_value:
+ if (j)
+ {
+ if (i->u.r != j->u.r)
+ return false;
+ }
+ break;
+
+ case DW_CFA_def_cfa_offset:
+ if (j)
+ {
+ if (i->u.i != j->u.i)
+ return false;
+ }
+ break;
+
+ default:
+ return false;
+ }
+ return true;
+}
+
static struct cie_entry *
-select_cie_for_fde (struct fde_entry *fde, bfd_boolean eh_frame,
+select_cie_for_fde (struct fde_entry *fde, bool eh_frame,
struct cfi_insn_data **pfirst, int align)
{
struct cfi_insn_data *i, *j;
{
if (CUR_SEG (cie) != CUR_SEG (fde))
continue;
+#ifdef tc_cie_fde_equivalent_extra
+ if (!tc_cie_fde_equivalent_extra (cie, fde))
+ continue;
+#endif
if (cie->return_column != fde->return_column
- || cie->pauth_key != fde->pauth_key
|| cie->signal_frame != fde->signal_frame
|| cie->per_encoding != fde->per_encoding
|| cie->lsda_encoding != fde->lsda_encoding)
i != cie->last && j != NULL;
i = i->next, j = j->next)
{
- if (i->insn != j->insn)
- goto fail;
- switch (i->insn)
- {
- case DW_CFA_advance_loc:
- case DW_CFA_remember_state:
- /* We reached the first advance/remember in the FDE,
- but did not reach the end of the CIE list. */
- goto fail;
-
- case DW_CFA_offset:
- case DW_CFA_def_cfa:
- if (i->u.ri.reg != j->u.ri.reg)
- goto fail;
- if (i->u.ri.offset != j->u.ri.offset)
- goto fail;
- break;
-
- case DW_CFA_register:
- if (i->u.rr.reg1 != j->u.rr.reg1)
- goto fail;
- if (i->u.rr.reg2 != j->u.rr.reg2)
- goto fail;
- break;
-
- case DW_CFA_def_cfa_register:
- case DW_CFA_restore:
- case DW_CFA_undefined:
- case DW_CFA_same_value:
- if (i->u.r != j->u.r)
- goto fail;
- break;
-
- case DW_CFA_def_cfa_offset:
- if (i->u.i != j->u.i)
- goto fail;
- break;
-
- case CFI_escape:
- case CFI_val_encoded_addr:
- case CFI_label:
- /* Don't bother matching these for now. */
- goto fail;
-
- default:
- abort ();
- }
+ if (!initial_cie_insn (i, j))
+ break;
}
- /* Success if we reached the end of the CIE list, and we've either
- run out of FDE entries or we've encountered an advance,
- remember, or escape. */
- if (i == cie->last
- && (!j
- || j->insn == DW_CFA_advance_loc
- || j->insn == DW_CFA_remember_state
- || j->insn == CFI_escape
- || j->insn == CFI_val_encoded_addr
- || j->insn == CFI_label))
+ if (i == cie->last)
{
*pfirst = j;
return cie;
}
-
- fail:;
}
cie = XNEW (struct cie_entry);
cie->lsda_encoding = fde->lsda_encoding;
cie->personality = fde->personality;
cie->first = fde->data;
- cie->pauth_key = fde->pauth_key;
+#ifdef tc_cie_entry_init_extra
+ tc_cie_entry_init_extra (cie, fde)
+#endif
for (i = cie->first; i ; i = i->next)
- if (i->insn == DW_CFA_advance_loc
- || i->insn == DW_CFA_remember_state
- || i->insn == CFI_escape
- || i->insn == CFI_val_encoded_addr
- || i->insn == CFI_label)
+ if (!initial_cie_insn (i, NULL))
break;
cie->last = i;
exp.X_add_number = addend;
exp.X_add_symbol = sym;
- emit_expr_encoded (&exp, DW_EH_PE_sdata4 | DW_EH_PE_pcrel, FALSE);
+ emit_expr_encoded (&exp, DW_EH_PE_sdata4 | DW_EH_PE_pcrel, false);
}
static void
if (all_fde_data == 0)
return;
- cfi_sections_set = TRUE;
+ cfi_sections_set = true;
if ((all_cfi_sections & CFI_EMIT_eh_frame) != 0
|| (all_cfi_sections & CFI_EMIT_eh_frame_compact) != 0)
{
fde->end_address = fde->start_address;
}
- cie = select_cie_for_fde (fde, TRUE, &first, 2);
+ cie = select_cie_for_fde (fde, true, &first, 2);
fde->eh_loc = symbol_temp_new_now ();
- output_fde (fde, cie, TRUE, first,
+ output_fde (fde, cie, true, first,
fde->next == NULL ? EH_FRAME_ALIGNMENT : 2);
}
}
flag_traditional_format = save_flag_traditional_format;
}
- cfi_sections_set = TRUE;
+ cfi_sections_set = true;
if ((all_cfi_sections & CFI_EMIT_debug_frame) != 0)
{
int alignment = ffs (DWARF2_ADDR_SIZE (stdoutput)) - 1;
fde->per_encoding = DW_EH_PE_omit;
fde->lsda_encoding = DW_EH_PE_omit;
cfi_change_reg_numbers (fde->data, ccseg);
- cie = select_cie_for_fde (fde, FALSE, &first, alignment);
- output_fde (fde, cie, FALSE, first, alignment);
+ cie = select_cie_for_fde (fde, false, &first, alignment);
+ output_fde (fde, cie, false, first, alignment);
}
}
while (SUPPORT_FRAME_LINKONCE && seek_next_seg == 2);
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