X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gas%2Fdw2gencfi.c;h=3be7e20f5d23d45b65374c9229a8dfb383df0525;hb=b639a77072d942b098bcef1f4270c873f06dfce1;hp=0b5059263f5b9e05131e670d5caa9fb5189bc92d;hpb=7ed2c8b0264cbcdcd2b8222bf444e960a9690bce;p=deliverable%2Fbinutils-gdb.git diff --git a/gas/dw2gencfi.c b/gas/dw2gencfi.c index 0b5059263f..3be7e20f5d 100644 --- a/gas/dw2gencfi.c +++ b/gas/dw2gencfi.c @@ -19,812 +19,1024 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ -#include #include "as.h" #include "dw2gencfi.h" -struct cie_entry + +/* We re-use DWARF2_LINE_MIN_INSN_LENGTH for the code alignment field + of the CIE. Default to 1 if not otherwise specified. */ +#ifndef DWARF2_LINE_MIN_INSN_LENGTH +# define DWARF2_LINE_MIN_INSN_LENGTH 1 +#endif + +/* If TARGET_USE_CFIPOP is defined, it is required that the target + provide the following definitions. Otherwise provide them to + allow compilation to continue. */ +#ifndef TARGET_USE_CFIPOP +# ifndef DWARF2_DEFAULT_RETURN_COLUMN +# define DWARF2_DEFAULT_RETURN_COLUMN 0 +# endif +# ifndef DWARF2_CIE_DATA_ALIGNMENT +# define DWARF2_CIE_DATA_ALIGNMENT 1 +# endif +#endif + +#ifndef EH_FRAME_ALIGNMENT +# ifdef BFD_ASSEMBLER +# define EH_FRAME_ALIGNMENT (bfd_get_arch_size (stdoutput) == 64 ? 3 : 2) +# else +# define EH_FRAME_ALIGNMENT 2 +# endif +#endif + +#ifndef tc_cfi_frame_initial_instructions +# define tc_cfi_frame_initial_instructions() ((void)0) +#endif + + +struct cfi_insn_data { - unsigned long offset; - size_t size; - void *data; - struct cie_entry *next; + struct cfi_insn_data *next; + int insn; + union { + struct { + unsigned reg; + offsetT offset; + } ri; + + struct { + unsigned reg1; + unsigned reg2; + } rr; + + unsigned r; + offsetT i; + + struct { + symbolS *lab1; + symbolS *lab2; + } ll; + + struct cfi_escape_data { + struct cfi_escape_data *next; + expressionS exp; + } *esc; + } u; }; -struct cfi_data +struct fde_entry { - enum cfi_insn insn; - long param[2]; - struct cfi_data *next; + struct fde_entry *next; + symbolS *start_address; + symbolS *end_address; + struct cfi_insn_data *data; + struct cfi_insn_data **last; + unsigned int return_column; }; -struct cfi_info +struct cie_entry { - addressT start_address; - addressT end_address; - addressT last_address; - const char *labelname; - struct cfi_data *data; - struct cfi_info *next; + struct cie_entry *next; + symbolS *start_address; + unsigned int return_column; + struct cfi_insn_data *first, *last; }; -/* Current open CFI entry. */ -static struct cfi_info *cfi_info; + +/* Current open FDE entry. */ +static struct fde_entry *cur_fde_data; +static symbolS *last_address; +static offsetT cur_cfa_offset; + +/* List of FDE entries. */ +static struct fde_entry *all_fde_data; +static struct fde_entry **last_fde_data = &all_fde_data; /* List of CIEs so that they could be reused. */ static struct cie_entry *cie_root; -/* Current target config. */ -static struct cfi_config current_config; +/* Stack of old CFI data, for save/restore. */ +struct cfa_save_data +{ + struct cfa_save_data *next; + offsetT cfa_offset; +}; -/* This is the main entry point to the CFI machinery. */ -static void dot_cfi (int arg); +static struct cfa_save_data *cfa_save_stack; + +/* Construct a new FDE structure and add it to the end of the fde list. */ -const pseudo_typeS cfi_pseudo_table[] = - { - { "cfi_verbose", dot_cfi, CFI_verbose }, - { "cfi_startproc", dot_cfi, CFI_startproc }, - { "cfi_endproc", dot_cfi, CFI_endproc }, - { "cfi_def_cfa", dot_cfi, CFA_def_cfa }, - { "cfi_def_cfa_register", dot_cfi, CFA_def_cfa_register }, - { "cfi_def_cfa_offset", dot_cfi, CFA_def_cfa_offset }, - { "cfi_adjust_cfa_offset", dot_cfi, CFI_adjust_cfa_offset }, - { "cfi_offset", dot_cfi, CFA_offset }, - { "cfi_register", dot_cfi, CFA_register }, - { NULL, NULL, 0 } - }; +static struct fde_entry * +alloc_fde_entry (void) +{ + struct fde_entry *fde = xcalloc (1, sizeof (struct fde_entry)); + + cur_fde_data = fde; + *last_fde_data = fde; + last_fde_data = &fde->next; + + fde->last = &fde->data; + fde->return_column = DWARF2_DEFAULT_RETURN_COLUMN; + + return fde; +} + +/* The following functions are available for a backend to construct its + own unwind information, usually from legacy unwind directives. */ -static const char * -cfi_insn_str (enum cfi_insn insn) +/* Construct a new INSN structure and add it to the end of the insn list + for the currently active FDE. */ + +static struct cfi_insn_data * +alloc_cfi_insn_data (void) { - switch (insn) - { - case CFA_nop: - return "CFA_nop"; - case CFA_set_loc: - return "CFA_set_loc"; - case CFA_advance_loc1: - return "CFA_advance_loc1"; - case CFA_advance_loc2: - return "CFA_advance_loc2"; - case CFA_advance_loc4: - return "CFA_advance_loc4"; - case CFA_offset_extended: - return "CFA_offset_extended"; - case CFA_resotre_extended: - return "CFA_resotre_extended"; - case CFA_undefined: - return "CFA_undefined"; - case CFA_same_value: - return "CFA_same_value"; - case CFA_register: - return "CFA_register"; - case CFA_remember_state: - return "CFA_remember_state"; - case CFA_restore_state: - return "CFA_restore_state"; - case CFA_def_cfa: - return "CFA_def_cfa"; - case CFA_def_cfa_register: - return "CFA_def_cfa_register"; - case CFA_def_cfa_offset: - return "CFA_def_cfa_offset"; - case CFA_advance_loc: - return "CFA_advance_loc"; - case CFA_offset: - return "CFA_offset"; - case CFA_restore: - return "CFA_restore"; - default: - break; - } + struct cfi_insn_data *insn = xcalloc (1, sizeof (struct cfi_insn_data)); - return "CFA_unknown"; + *cur_fde_data->last = insn; + cur_fde_data->last = &insn->next; + + return insn; } -static struct cfi_data * -alloc_cfi_data (void) +/* Construct a new FDE structure that begins at LABEL. */ + +void +cfi_new_fde (symbolS *label) { - return (struct cfi_data *) xcalloc (sizeof (struct cfi_info), 1); + struct fde_entry *fde = alloc_fde_entry (); + fde->start_address = label; + last_address = label; } -static struct cfi_info * -alloc_cfi_info (void) +/* End the currently open FDE. */ + +void +cfi_end_fde (symbolS *label) { - return (struct cfi_info *) xcalloc (sizeof (struct cfi_info), 1); + cur_fde_data->end_address = label; + cur_fde_data = NULL; } -/* Parse arguments. */ -static int -cfi_parse_arg (long *param, int resolvereg) +/* Set the return column for the current FDE. */ + +void +cfi_set_return_column (unsigned regno) { - long value; - int retval = -1; - int nchars; + cur_fde_data->return_column = regno; +} - assert (param != NULL); - SKIP_WHITESPACE (); +/* Universal functions to store new instructions. */ - if (sscanf (input_line_pointer, "%li%n", &value, &nchars) >= 1) - { - input_line_pointer += nchars; - retval = 1; - } -#ifdef tc_regname_to_dw2regnum - else if (resolvereg && ((is_name_beginner (*input_line_pointer)) - || (*input_line_pointer == '%' - && is_name_beginner (*(++input_line_pointer))))) - { - char *name, c, *p; +static void +cfi_add_CFA_insn(int insn) +{ + struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); - name = input_line_pointer; - c = get_symbol_end (); - p = input_line_pointer; + insn_ptr->insn = insn; +} - if ((value = tc_regname_to_dw2regnum (name)) >= 0) - retval = 1; +static void +cfi_add_CFA_insn_reg (int insn, unsigned regno) +{ + struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); - *p = c; - } -#endif - else - as_bad (resolvereg ? - _("can't convert argument to a register number") : - _("can't convert argument to an integer")); + insn_ptr->insn = insn; + insn_ptr->u.r = regno; +} - if (retval > 0) - *param = value; +static void +cfi_add_CFA_insn_offset (int insn, offsetT offset) +{ + struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); - SKIP_WHITESPACE (); - if (*input_line_pointer == ',') - { - input_line_pointer++; - SKIP_WHITESPACE (); - } + insn_ptr->insn = insn; + insn_ptr->u.i = offset; +} - return retval; +static void +cfi_add_CFA_insn_reg_reg (int insn, unsigned reg1, unsigned reg2) +{ + struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); + + insn_ptr->insn = insn; + insn_ptr->u.rr.reg1 = reg1; + insn_ptr->u.rr.reg2 = reg2; } -static int -cfi_parse_reg (long *param) +static void +cfi_add_CFA_insn_reg_offset (int insn, unsigned regno, offsetT offset) { - return cfi_parse_arg (param, 1); + struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); + + insn_ptr->insn = insn; + insn_ptr->u.ri.reg = regno; + insn_ptr->u.ri.offset = offset; } -static int -cfi_parse_const (long *param) +/* Add a CFI insn to advance the PC from the last address to LABEL. */ + +void +cfi_add_advance_loc (symbolS *label) +{ + struct cfi_insn_data *insn = alloc_cfi_insn_data (); + + insn->insn = DW_CFA_advance_loc; + insn->u.ll.lab1 = last_address; + insn->u.ll.lab2 = label; + + last_address = label; +} + +/* Add a DW_CFA_offset record to the CFI data. */ + +void +cfi_add_CFA_offset (unsigned regno, offsetT offset) +{ + unsigned int abs_data_align; + + cfi_add_CFA_insn_reg_offset (DW_CFA_offset, regno, offset); + + abs_data_align = (DWARF2_CIE_DATA_ALIGNMENT < 0 + ? -DWARF2_CIE_DATA_ALIGNMENT : DWARF2_CIE_DATA_ALIGNMENT); + if (offset % abs_data_align) + as_bad (_("register save offset not a multiple of %u"), abs_data_align); +} + +/* Add a DW_CFA_def_cfa record to the CFI data. */ + +void +cfi_add_CFA_def_cfa (unsigned regno, offsetT offset) { - return cfi_parse_arg (param, 0); + cfi_add_CFA_insn_reg_offset (DW_CFA_def_cfa, regno, offset); + cur_cfa_offset = offset; } +/* Add a DW_CFA_register record to the CFI data. */ + void -cfi_add_insn (enum cfi_insn insn, long param0, long param1) +cfi_add_CFA_register (unsigned reg1, unsigned reg2) { - struct cfi_data *data_ptr; + cfi_add_CFA_insn_reg_reg (DW_CFA_register, reg1, reg2); +} + +/* Add a DW_CFA_def_cfa_register record to the CFI data. */ - if (!cfi_info->data) +void +cfi_add_CFA_def_cfa_register (unsigned regno) +{ + cfi_add_CFA_insn_reg (DW_CFA_def_cfa_register, regno); +} + +/* Add a DW_CFA_def_cfa_offset record to the CFI data. */ + +void +cfi_add_CFA_def_cfa_offset (offsetT offset) +{ + cfi_add_CFA_insn_offset (DW_CFA_def_cfa_offset, offset); + cur_cfa_offset = offset; +} + +void +cfi_add_CFA_restore (unsigned regno) +{ + cfi_add_CFA_insn_reg (DW_CFA_restore, regno); +} + +void +cfi_add_CFA_undefined (unsigned regno) +{ + cfi_add_CFA_insn_reg (DW_CFA_undefined, regno); +} + +void +cfi_add_CFA_same_value (unsigned regno) +{ + cfi_add_CFA_insn_reg (DW_CFA_same_value, regno); +} + +void +cfi_add_CFA_remember_state (void) +{ + struct cfa_save_data *p; + + cfi_add_CFA_insn (DW_CFA_remember_state); + + p = xmalloc (sizeof (*p)); + p->cfa_offset = cur_cfa_offset; + p->next = cfa_save_stack; + cfa_save_stack = p; +} + +void +cfi_add_CFA_restore_state (void) +{ + struct cfa_save_data *p; + + cfi_add_CFA_insn (DW_CFA_restore_state); + + p = cfa_save_stack; + if (p) { - cfi_info->data = alloc_cfi_data (); - data_ptr = cfi_info->data; + cur_cfa_offset = p->cfa_offset; + cfa_save_stack = p->next; + free (p); } - else - { - data_ptr = cfi_info->data; +} - while (data_ptr && data_ptr->next) - data_ptr = data_ptr->next; + +/* Parse CFI assembler directives. */ - data_ptr->next = alloc_cfi_data (); +static void dot_cfi (int); +static void dot_cfi_escape (int); +static void dot_cfi_startproc (int); +static void dot_cfi_endproc (int); - data_ptr = data_ptr->next; - } +/* Fake CFI type; outside the byte range of any real CFI insn. */ +#define CFI_adjust_cfa_offset 0x100 +#define CFI_return_column 0x101 +#define CFI_rel_offset 0x102 +#define CFI_escape 0x103 - data_ptr->insn = insn; - data_ptr->param[0] = param0; - data_ptr->param[1] = param1; -} +const pseudo_typeS cfi_pseudo_table[] = + { + { "cfi_startproc", dot_cfi_startproc, 0 }, + { "cfi_endproc", dot_cfi_endproc, 0 }, + { "cfi_def_cfa", dot_cfi, DW_CFA_def_cfa }, + { "cfi_def_cfa_register", dot_cfi, DW_CFA_def_cfa_register }, + { "cfi_def_cfa_offset", dot_cfi, DW_CFA_def_cfa_offset }, + { "cfi_adjust_cfa_offset", dot_cfi, CFI_adjust_cfa_offset }, + { "cfi_offset", dot_cfi, DW_CFA_offset }, + { "cfi_rel_offset", dot_cfi, CFI_rel_offset }, + { "cfi_register", dot_cfi, DW_CFA_register }, + { "cfi_return_column", dot_cfi, CFI_return_column }, + { "cfi_restore", dot_cfi, DW_CFA_restore }, + { "cfi_undefined", dot_cfi, DW_CFA_undefined }, + { "cfi_same_value", dot_cfi, DW_CFA_same_value }, + { "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_escape", dot_cfi_escape, 0 }, + { NULL, NULL, 0 } + }; static void -cfi_advance_loc (void) +cfi_parse_separator (void) { - addressT curr_address = frag_now_fix (); - if (cfi_info->last_address == curr_address) - return; - cfi_add_insn (CFA_advance_loc, - (long) (curr_address - cfi_info->last_address), 0); - cfi_info->last_address = curr_address; + SKIP_WHITESPACE (); + if (*input_line_pointer == ',') + input_line_pointer++; + else + as_bad (_("missing separator")); } -static long -get_current_offset (struct cfi_info *info) +static unsigned +cfi_parse_reg (void) { - long current_offset = 0; - struct cfi_data *data = info->data; + int regno; + expressionS exp; - current_offset = 0; - while (data) +#ifdef tc_regname_to_dw2regnum + SKIP_WHITESPACE (); + if (is_name_beginner (*input_line_pointer) + || (*input_line_pointer == '%' + && is_name_beginner (*++input_line_pointer))) { - if (data->insn == CFA_def_cfa) - current_offset = data->param[1]; - else if (data->insn == CFA_def_cfa_offset) - current_offset = data->param[0]; - data = data->next; + char *name, c; + + name = input_line_pointer; + c = get_symbol_end (); + + if ((regno = tc_regname_to_dw2regnum (name)) < 0) + { + as_bad (_("bad register expression")); + regno = 0; + } + + *input_line_pointer = c; + return regno; + } +#endif + + expression (&exp); + switch (exp.X_op) + { + case O_register: + case O_constant: + regno = exp.X_add_number; + break; + + default: + as_bad (_("bad register expression")); + regno = 0; + break; } - return current_offset; + return regno; +} + +static offsetT +cfi_parse_const (void) +{ + return get_absolute_expression (); } static void -cfi_make_insn (int arg) +dot_cfi (int arg) { - long param[2] = { 0, 0 }; + offsetT offset; + unsigned reg1, reg2; - if (!cfi_info) + if (!cur_fde_data) { as_bad (_("CFI instruction used without previous .cfi_startproc")); return; } - cfi_advance_loc (); + /* If the last address was not at the current PC, advance to current. */ + if (symbol_get_frag (last_address) != frag_now + || S_GET_VALUE (last_address) != frag_now_fix ()) + cfi_add_advance_loc (symbol_temp_new_now ()); switch (arg) { - /* Instructions that take two arguments (register, integer). */ - case CFA_offset: - case CFA_def_cfa: - if (cfi_parse_reg (¶m[0]) < 0) - { - as_bad (_("first argument to %s is not a register"), - cfi_insn_str (arg)); - return; - } - if (cfi_parse_const (¶m[1]) < 0) - { - as_bad (_("second argument to %s is not a number"), - cfi_insn_str (arg)); - return; - } + case DW_CFA_offset: + reg1 = cfi_parse_reg (); + cfi_parse_separator (); + offset = cfi_parse_const (); + cfi_add_CFA_offset (reg1, offset); break; - case CFA_register: - if (cfi_parse_reg (¶m[0]) < 0) - { - as_bad (_("first argument to %s is not a register"), - cfi_insn_str (arg)); - return; - } - if (cfi_parse_reg (¶m[1]) < 0) - { - as_bad (_("second argument to %s is not a register"), - cfi_insn_str (arg)); - return; - } + case CFI_rel_offset: + reg1 = cfi_parse_reg (); + cfi_parse_separator (); + offset = cfi_parse_const (); + cfi_add_CFA_offset (reg1, offset - cur_cfa_offset); break; - /* Instructions that take one register argument. */ - case CFA_def_cfa_register: - if (cfi_parse_reg (¶m[0]) < 0) - { - as_bad (_("argument to %s is not a register"), cfi_insn_str (arg)); - return; - } + case DW_CFA_def_cfa: + reg1 = cfi_parse_reg (); + cfi_parse_separator (); + offset = cfi_parse_const (); + cfi_add_CFA_def_cfa (reg1, offset); break; - /* Instructions that take one integer argument. */ - case CFA_def_cfa_offset: - if (cfi_parse_const (¶m[0]) < 0) - { - as_bad (_("argument to %s is not a number"), cfi_insn_str (arg)); - return; - } + case DW_CFA_register: + reg1 = cfi_parse_reg (); + cfi_parse_separator (); + reg2 = cfi_parse_reg (); + cfi_add_CFA_register (reg1, reg2); + break; + + case DW_CFA_def_cfa_register: + reg1 = cfi_parse_reg (); + cfi_add_CFA_def_cfa_register (reg1); + break; + + case DW_CFA_def_cfa_offset: + offset = cfi_parse_const (); + cfi_add_CFA_def_cfa_offset (offset); break; - /* Special handling for pseudo-instruction. */ case CFI_adjust_cfa_offset: - if (cfi_parse_const (¶m[0]) < 0) - { - as_bad (_("argument to %s is not a number"), - ".cfi_adjust_cfa_offset"); - return; - } - param[0] += get_current_offset (cfi_info); - arg = CFA_def_cfa_offset; + offset = cfi_parse_const (); + cfi_add_CFA_def_cfa_offset (cur_cfa_offset + offset); + break; + + case DW_CFA_restore: + reg1 = cfi_parse_reg (); + cfi_add_CFA_restore (reg1); + break; + + case DW_CFA_undefined: + reg1 = cfi_parse_reg (); + cfi_add_CFA_undefined (reg1); + 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_remember_state: + cfi_add_CFA_remember_state (); + break; + + case DW_CFA_restore_state: + cfi_add_CFA_restore_state (); + break; + + case DW_CFA_GNU_window_save: + cfi_add_CFA_insn (DW_CFA_GNU_window_save); break; default: - as_bad (_("unknown CFI instruction %d (%s)"), arg, cfi_insn_str (arg)); - return; + abort (); } - cfi_add_insn (arg, param[0], param[1]); + + demand_empty_rest_of_line (); } -static symbolS * -cfi_get_label (void) +static void +dot_cfi_escape (int ignored ATTRIBUTE_UNUSED) { - char symname[40], *symbase=".Llbl_cfi"; - symbolS *symbolP; - unsigned int i = 0; + struct cfi_escape_data *head, **tail, *e; + struct cfi_insn_data *insn; - snprintf (symname, sizeof (symname), "%s_0x%lx", - symbase, (long) frag_now_fix ()); - while ((symbolP = symbol_find (symname))) + if (!cur_fde_data) { - if ((S_GET_VALUE (symbolP) == frag_now_fix ()) - && (S_GET_SEGMENT (symbolP) == now_seg)) - return symbolP; + as_bad (_("CFI instruction used without previous .cfi_startproc")); + return; + } + + /* If the last address was not at the current PC, advance to current. */ + if (symbol_get_frag (last_address) != frag_now + || S_GET_VALUE (last_address) != frag_now_fix ()) + cfi_add_advance_loc (symbol_temp_new_now ()); - snprintf (symname, sizeof (symname), "%s_0x%lx_%u", - symbase, (long) frag_now_fix (), i++); + tail = &head; + do + { + e = xmalloc (sizeof (*e)); + do_parse_cons_expression (&e->exp, 1); + *tail = e; + tail = &e->next; } -#ifdef BFD_ASSEMBLER - symbolP = (symbolS *) local_symbol_make (symname, now_seg, - (valueT) frag_now_fix (), - frag_now); -#else - symbolP = symbol_make (symname); -#endif - return symbolP; + while (*input_line_pointer++ == ','); + *tail = NULL; + + insn = alloc_cfi_insn_data (); + insn->insn = CFI_escape; + insn->u.esc = head; } static void -dot_cfi_startproc (void) +dot_cfi_startproc (int ignored ATTRIBUTE_UNUSED) { -#ifdef tc_cfi_frame_initial_instructions - const char *simple = "simple"; -#endif + int simple = 0; - if (cfi_info) + if (cur_fde_data) { as_bad (_("previous CFI entry not closed (missing .cfi_endproc)")); return; } -#if defined(TARGET_USE_CFIPOP) - /* Because this file is linked even for architectures that - don't use CFI, we must wrap this call. */ - if (current_config.addr_length == 0) - tc_cfi_init (); -#endif + cfi_new_fde (symbol_temp_new_now ()); - cfi_info = alloc_cfi_info (); + SKIP_WHITESPACE (); + if (is_name_beginner (*input_line_pointer)) + { + char *name, c; - cfi_info->start_address = frag_now_fix (); - cfi_info->last_address = cfi_info->start_address; - cfi_info->labelname = S_GET_NAME (cfi_get_label ()); + name = input_line_pointer; + c = get_symbol_end (); - SKIP_WHITESPACE (); -#ifdef tc_cfi_frame_initial_instructions - if (strncmp (simple, input_line_pointer, strlen (simple)) != 0) + if (strcmp (name, "simple") == 0) + { + simple = 1; + *input_line_pointer = c; + } + else + input_line_pointer = name; + } + demand_empty_rest_of_line (); + + if (!simple) tc_cfi_frame_initial_instructions (); - else - input_line_pointer += strlen (simple); -#endif } -#define cfi_is_advance_insn(insn) \ - ((insn >= CFA_set_loc && insn <= CFA_advance_loc4) \ - || insn == CFA_advance_loc) +static void +dot_cfi_endproc (int ignored ATTRIBUTE_UNUSED) +{ + if (! cur_fde_data) + { + as_bad (_(".cfi_endproc without corresponding .cfi_startproc")); + return; + } -/* Output CFI instructions to the file. */ + cfi_end_fde (symbol_temp_new_now ()); +} -enum data_types - { - t_ascii = 0, - t_byte = 1, - t_half = 2, - t_long = 4, - t_quad = 8, - t_uleb128 = 0x10, - t_sleb128 = 0x11 - }; + +/* Emit a single byte into the current segment. */ -static int -output_data (char **p, unsigned long *size, enum data_types type, long value) +static inline void +out_one (int byte) { - char *ptr = *p; - unsigned int ret_size; + FRAG_APPEND_1_CHAR (byte); +} - switch (type) - { - case t_byte: - ret_size = 1; - break; - case t_half: - ret_size = 2; - break; - case t_long: - ret_size = 4; - break; - case t_quad: - case t_uleb128: - case t_sleb128: - ret_size = 8; - break; - default: - /* This should never happen - throw an internal error. */ - as_fatal (_("unknown type %d"), type); - return 0; - } +/* Emit a two-byte word into the current segment. */ - if (*size < ret_size) - { - as_bad (_("output_data buffer is too small")); - return 0; - } +static inline void +out_two (int data) +{ + md_number_to_chars (frag_more (2), data, 2); +} - switch (type) - { - case t_byte: - *ptr = (char) value; - if (verbose) - printf ("\t.byte\t0x%x\n", (unsigned char) *ptr); - break; - case t_half: - *(short *) ptr = (short) value & 0xFFFF; - if (verbose) - printf ("\t.half\t0x%x\n", (unsigned short) *ptr); - break; - case t_long: - *(int *) ptr = (int) value & 0xFFFFFFFF; - if (verbose) - printf ("\t.long\t0x%x\n", (unsigned int) *ptr); - break; - case t_quad: - *(long long *) ptr = (long long) value & 0xFFFFFFFF; - if (verbose) - printf ("\t.quad\t0x%x\n", (unsigned int) *ptr); - break; - case t_uleb128: - case t_sleb128: - ret_size = output_leb128 (ptr, value, type == t_sleb128); - if (verbose) - printf ("\t.%s\t0x%lx\n", - type == t_sleb128 ? "sleb128" : "uleb128", - value); - break; - default: - as_fatal (_("unknown type %d"), type); - return 0; - } +/* Emit a four byte word into the current segment. */ - *size -= ret_size; - *p += ret_size; +static inline void +out_four (int data) +{ + md_number_to_chars (frag_more (4), data, 4); +} + +/* Emit an unsigned "little-endian base 128" number. */ - return ret_size; +static void +out_uleb128 (addressT value) +{ + output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0); } -static int -cfi_output_insn (struct cfi_data *data, char **buf, unsigned long *buf_size) +/* Emit an unsigned "little-endian base 128" number. */ + +static void +out_sleb128 (offsetT value) { - char **pbuf = buf, *orig_buf = *buf; - unsigned long size; + output_leb128 (frag_more (sizeof_leb128 (value, 1)), value, 1); +} - if (!data || !buf) - as_fatal (_("cfi_output_insn called with NULL pointer")); +static void +output_cfi_insn (struct cfi_insn_data *insn) +{ + offsetT offset; + unsigned int regno; - switch (data->insn) + switch (insn->insn) { - case CFA_advance_loc: - if (verbose) - printf ("\t# %s(%ld)\n", cfi_insn_str (data->insn), - data->param[0]); - if (data->param[0] <= 0x3F) + case DW_CFA_advance_loc: + { + symbolS *from = insn->u.ll.lab1; + symbolS *to = insn->u.ll.lab2; + + if (symbol_get_frag (to) == symbol_get_frag (from)) + { + addressT delta = S_GET_VALUE (to) - S_GET_VALUE (from); + addressT scaled = delta / DWARF2_LINE_MIN_INSN_LENGTH; + + if (scaled <= 0x3F) + out_one (DW_CFA_advance_loc + scaled); + else if (delta <= 0xFF) + { + out_one (DW_CFA_advance_loc1); + out_one (delta); + } + else if (delta <= 0xFFFF) + { + out_one (DW_CFA_advance_loc2); + out_two (delta); + } + else + { + out_one (DW_CFA_advance_loc4); + out_four (delta); + } + } + else + { + expressionS exp; + + exp.X_op = O_subtract; + exp.X_add_symbol = to; + exp.X_op_symbol = from; + exp.X_add_number = 0; + + /* 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. */ + frag_more (1); + + frag_var (rs_cfa, 4, 0, DWARF2_LINE_MIN_INSN_LENGTH << 3, + make_expr_symbol (&exp), frag_now_fix () - 1, + (char *) frag_now); + } + } + break; + + case DW_CFA_def_cfa: + offset = insn->u.ri.offset; + if (offset < 0) { - output_data (pbuf, buf_size, t_byte, CFA_advance_loc + - (data->param[0] / current_config.code_align)); + out_one (DW_CFA_def_cfa_sf); + out_uleb128 (insn->u.ri.reg); + out_uleb128 (offset); } - else if (data->param[0] <= 0xFF) + else { - output_data (pbuf, buf_size, t_byte, CFA_advance_loc1); - output_data (pbuf, buf_size, t_byte, - data->param[0] / current_config.code_align); + out_one (DW_CFA_def_cfa); + out_uleb128 (insn->u.ri.reg); + out_uleb128 (offset); } - else if (data->param[0] <= 0xFFFF) + break; + + case DW_CFA_def_cfa_register: + case DW_CFA_undefined: + case DW_CFA_same_value: + out_one (insn->insn); + out_uleb128 (insn->u.r); + break; + + case DW_CFA_def_cfa_offset: + offset = insn->u.i; + if (offset < 0) { - output_data (pbuf, buf_size, t_byte, CFA_advance_loc2); - output_data (pbuf, buf_size, t_half, - data->param[0] / current_config.code_align); + out_one (DW_CFA_def_cfa_offset_sf); + out_sleb128 (offset); } else { - output_data (pbuf, buf_size, t_byte, CFA_advance_loc4); - output_data (pbuf, buf_size, t_long, - data->param[0] / current_config.code_align); + out_one (DW_CFA_def_cfa_offset); + out_uleb128 (offset); } break; - case CFA_def_cfa: - if (verbose) - printf ("\t# CFA_def_cfa(%ld,%ld)\n", - data->param[0], data->param[1]); - output_data (pbuf, buf_size, t_byte, CFA_def_cfa); - output_data (pbuf, buf_size, t_uleb128, data->param[0]); - output_data (pbuf, buf_size, t_uleb128, data->param[1]); - break; - - case CFA_def_cfa_register: - case CFA_def_cfa_offset: - if (verbose) - printf ("\t# %s(%ld)\n", cfi_insn_str (data->insn), - data->param[0]); - output_data (pbuf, buf_size, t_byte, data->insn); - output_data (pbuf, buf_size, t_uleb128, data->param[0]); + case DW_CFA_restore: + regno = insn->u.r; + if (regno <= 0x3F) + { + out_one (DW_CFA_restore + regno); + } + else + { + out_one (DW_CFA_restore_extended); + out_uleb128 (regno); + } break; - case CFA_offset: - if (verbose) - printf ("\t# %s(%ld,%ld)\n", cfi_insn_str (data->insn), - data->param[0], data->param[1]); - - /* Check whether to use CFA_offset or CFA_offset_extended. */ - if (data->param[0] <= 0x3F) - output_data (pbuf, buf_size, t_byte, CFA_offset + data->param[0]); + case DW_CFA_offset: + regno = insn->u.ri.reg; + offset = insn->u.ri.offset / DWARF2_CIE_DATA_ALIGNMENT; + if (offset < 0) + { + out_one (DW_CFA_offset_extended_sf); + out_uleb128 (regno); + out_sleb128 (offset); + } + else if (regno <= 0x3F) + { + out_one (DW_CFA_offset + regno); + out_uleb128 (offset); + } else { - output_data (pbuf, buf_size, t_byte, CFA_offset_extended); - output_data (pbuf, buf_size, t_uleb128, data->param[0]); + out_one (DW_CFA_offset_extended); + out_uleb128 (regno); + out_uleb128 (offset); } - output_data (pbuf, buf_size, t_uleb128, - data->param[1] / current_config.data_align); break; - case CFA_register: - if (verbose) - printf ("\t# %s(%ld,%ld)\n", cfi_insn_str (data->insn), - data->param[0], data->param[1]); - output_data (pbuf, buf_size, t_byte, CFA_register); - output_data (pbuf, buf_size, t_uleb128, data->param[0]); - output_data (pbuf, buf_size, t_uleb128, data->param[1]); + case DW_CFA_register: + out_one (DW_CFA_register); + out_uleb128 (insn->u.rr.reg1); + out_uleb128 (insn->u.rr.reg2); + break; + + case DW_CFA_remember_state: + case DW_CFA_restore_state: + out_one (insn->insn); break; - case CFA_nop: - if (verbose) - printf ("\t# CFA_nop\n"); - output_data (pbuf, buf_size, t_byte, CFA_nop); + case DW_CFA_GNU_window_save: + out_one (DW_CFA_GNU_window_save); break; + case CFI_escape: + { + struct cfi_escape_data *e; + for (e = insn->u.esc; e ; e = e->next) + emit_expr (&e->exp, 1); + break; + } + default: - as_warn ("CFA_unknown[%d](%ld,%ld)", data->insn, - data->param[0], data->param[1]); + abort (); } - size = *pbuf - orig_buf; - *buf = *pbuf; - *buf_size -= size; - return size; } static void -dot_cfi_endproc (void) -{ - struct cfi_data *data_ptr; - struct cie_entry *cie_ptr; - char *cie_buf, *fde_buf, *pbuf, *where; - unsigned long buf_size, cie_size, fde_size, last_cie_offset; - unsigned long fde_initloc_offset, fde_len_offset, fde_offset; - segT saved_seg, cfi_seg; +output_cie (struct cie_entry *cie) +{ + symbolS *after_size_address, *end_address; expressionS exp; - - if (! cfi_info) - { - as_bad (_(".cfi_endproc without corresponding .cfi_startproc")); - return; - } - cfi_info->end_address = frag_now_fix (); - - /* Open .eh_frame section. */ - saved_seg = now_seg; - cfi_seg = subseg_new (".eh_frame", 0); -#ifdef BFD_ASSEMBLER - bfd_set_section_flags (stdoutput, cfi_seg, - SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_DATA); + struct cfi_insn_data *i; + + cie->start_address = symbol_temp_new_now (); + after_size_address = symbol_temp_make (); + end_address = symbol_temp_make (); + + exp.X_op = O_subtract; + exp.X_add_symbol = end_address; + exp.X_op_symbol = after_size_address; + exp.X_add_number = 0; + + emit_expr (&exp, 4); /* Length */ + symbol_set_value_now (after_size_address); + out_four (0); /* CIE id */ + out_one (DW_CIE_VERSION); /* Version */ + out_one ('z'); /* Augmentation */ + out_one ('R'); + out_one (0); + out_uleb128 (DWARF2_LINE_MIN_INSN_LENGTH); /* Code alignment */ + out_sleb128 (DWARF2_CIE_DATA_ALIGNMENT); /* Data alignment */ + out_one (cie->return_column); /* Return column */ + out_uleb128 (1); /* Augmentation size */ +#if defined DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr + out_one (DW_EH_PE_pcrel | DW_EH_PE_sdata4); +#else + out_one (DW_EH_PE_sdata4); #endif - subseg_set (cfi_seg, 0); - - /* Build CIE. */ - cie_buf = xcalloc (1024, 1); - /* Skip space for CIE length. */ - pbuf = cie_buf + 4; - buf_size = 1020; - - if (verbose) - printf ("# CIE *****\n"); - - /* CIE id. */ - output_data (&pbuf, &buf_size, t_long, 0x0); - /* Version. */ - output_data (&pbuf, &buf_size, t_byte, 1); - /* Augmentation. */ - output_data (&pbuf, &buf_size, t_byte, 0); - /* Code alignment. */ - output_data (&pbuf, &buf_size, t_uleb128, current_config.code_align); - /* Data alignment. */ - output_data (&pbuf, &buf_size, t_sleb128, current_config.data_align); - /* Return address column. */ - output_data (&pbuf, &buf_size, t_byte, current_config.ra_column); - - /* Build CFI instructions. */ - data_ptr = cfi_info->data; - while (data_ptr && !cfi_is_advance_insn (data_ptr->insn)) - { - cfi_output_insn (data_ptr, &pbuf, &buf_size); - data_ptr = data_ptr->next; - } - - /* Align the whole data to current_config.eh_align. */ - cie_size = pbuf - cie_buf; - cie_size += current_config.eh_align - cie_size % current_config.eh_align; - /* CIE length. */ - pbuf = cie_buf; - output_data (&pbuf, &buf_size, t_long, cie_size - 4); + if (cie->first) + for (i = cie->first; i != cie->last; i = i->next) + output_cfi_insn (i); - /* OK, we built the CIE. Let's write it to the file... */ - last_cie_offset = frag_now_fix (); - - /* Check if we have already emitted the exactly same CIE. - If yes then use its offset instead and don't put out - the new one. */ - cie_ptr = cie_root; - while (cie_ptr) - { - if (cie_ptr->size == cie_size - 4 - && memcmp (cie_ptr->data, cie_buf + 4, cie_ptr->size) == 0) - break; - cie_ptr = cie_ptr->next; - } + symbol_set_value_now (end_address); +} - /* If we have found the same CIE, use it... */ - if (cie_ptr) - { - if (verbose) - printf ("# Duplicate CIE found. Previous is at offset %lu\n", - cie_ptr->offset); - last_cie_offset = cie_ptr->offset; - } - else - { - /* Otherwise join this CIE to the list. */ - where = (unsigned char *) frag_more (cie_size); - memcpy (where, cie_buf, cie_size); - if (cie_root) - { - cie_ptr = cie_root; - while (cie_ptr->next) - cie_ptr = cie_ptr->next; - cie_ptr->next = calloc (sizeof (struct cie_entry), 1); - cie_ptr = cie_ptr->next; - } - else - { - cie_root = calloc (sizeof (struct cie_entry), 1); - cie_ptr = cie_root; - } +static void +output_fde (struct fde_entry *fde, struct cie_entry *cie, + struct cfi_insn_data *first, int align) +{ + symbolS *after_size_address, *end_address; + expressionS exp; - cie_ptr->size = cie_size - 4; - cie_ptr->data = calloc (cie_ptr->size, 1); - cie_ptr->offset = last_cie_offset; - memcpy (cie_ptr->data, cie_buf + 4, cie_ptr->size); - } + after_size_address = symbol_temp_make (); + end_address = symbol_temp_make (); - /* Clean up. */ - free (cie_buf); + exp.X_op = O_subtract; + exp.X_add_symbol = end_address; + exp.X_op_symbol = after_size_address; + exp.X_add_number = 0; + emit_expr (&exp, 4); /* Length */ + symbol_set_value_now (after_size_address); - /* Build the FDE... */ - fde_buf = xcalloc (1024, 1); - pbuf = fde_buf; - buf_size = 1024; + exp.X_add_symbol = after_size_address; + exp.X_op_symbol = cie->start_address; + emit_expr (&exp, 4); /* CIE offset */ - /* Offset of this FDE in current fragment. */ - fde_offset = frag_now_fix (); +#ifdef DIFF_EXPR_OK + exp.X_add_symbol = fde->start_address; + exp.X_op_symbol = symbol_temp_new_now (); + emit_expr (&exp, 4); /* Code offset */ +#else + exp.X_op = O_symbol; + exp.X_add_symbol = fde->start_address; + exp.X_op_symbol = NULL; +#ifdef tc_cfi_emit_pcrel_expr + tc_cfi_emit_pcrel_expr (&exp, 4); /* Code offset */ +#else + emit_expr (&exp, 4); /* Code offset */ +#endif + exp.X_op = O_subtract; +#endif - if (verbose) - { - printf ("# FDE: start=0x%lx, end=0x%lx, delta=%d\n", - (long) cfi_info->start_address, - (long) cfi_info->end_address, - (int) (cfi_info->end_address - cfi_info->start_address)); - } + exp.X_add_symbol = fde->end_address; + exp.X_op_symbol = fde->start_address; /* Code length */ + emit_expr (&exp, 4); - /* FDE length (t_long, 4 bytes) - will be set later. */ - fde_len_offset = pbuf - fde_buf; - pbuf += 4; - buf_size -= 4; + out_uleb128 (0); /* Augmentation size */ - /* CIE pointer - offset from here. */ - output_data (&pbuf, &buf_size, t_long, fde_offset - last_cie_offset + 4); + for (; first; first = first->next) + output_cfi_insn (first); - /* FDE initial location - this must be set relocatable! */ - fde_initloc_offset = pbuf - fde_buf + fde_offset; - output_data (&pbuf, &buf_size, current_config.addr_length, - cfi_info->start_address); + if (align) + frag_align (align, 0, 0); + symbol_set_value_now (end_address); +} - /* FDE address range. */ - output_data (&pbuf, &buf_size, current_config.addr_length, - cfi_info->end_address - cfi_info->start_address); +static struct cie_entry * +select_cie_for_fde (struct fde_entry *fde, struct cfi_insn_data **pfirst) +{ + struct cfi_insn_data *i, *j; + struct cie_entry *cie; - while (data_ptr) + for (cie = cie_root; cie; cie = cie->next) { - cfi_output_insn (data_ptr, &pbuf, &buf_size); - data_ptr = data_ptr->next; - } - - fde_size = pbuf - fde_buf; - fde_size += current_config.eh_align - fde_size % current_config.eh_align; + if (cie->return_column != fde->return_column) + continue; + for (i = cie->first, j = fde->data; + 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: + /* We reached the first advance 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: + /* Don't bother matching these for now. */ + goto fail; + + default: + abort (); + } + } - /* Now we can set FDE length. */ - pbuf = fde_buf + fde_len_offset; - buf_size = 4; - output_data (&pbuf, &buf_size, t_long, fde_size - 4); + /* 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. */ + if (i == cie->last && (!j || j->insn == DW_CFA_advance_loc)) + { + *pfirst = j; + return cie; + } - /* Copy FDE to objfile. */ - where = (unsigned char *) frag_more (fde_size); - memcpy (where, fde_buf, fde_size); + fail:; + } - /* Set relocation for initial address. */ - buf_size = current_config.addr_length; - memset (&exp, 0, sizeof (exp)); - exp.X_op = O_symbol; - exp.X_add_symbol = symbol_find (cfi_info->labelname); - fix_new_exp (frag_now, fde_initloc_offset, - current_config.addr_length, - &exp, 0, current_config.reloc_type); + cie = xmalloc (sizeof (struct cie_entry)); + cie->next = cie_root; + cie_root = cie; + cie->return_column = fde->return_column; + cie->first = fde->data; - /* Clean up. */ - free (fde_buf); + for (i = cie->first; i ; i = i->next) + if (i->insn == DW_CFA_advance_loc) + break; - free (cfi_info); - cfi_info = NULL; + cie->last = i; + *pfirst = i; + + output_cie (cie); - /* Restore previous segment. */ - subseg_set (saved_seg, 0); + return cie; } void -dot_cfi (int arg) +cfi_finish (void) { - long param; + segT cfi_seg; + struct fde_entry *fde; + int save_flag_traditional_format; - switch (arg) + if (cur_fde_data) { - case CFI_startproc: - dot_cfi_startproc (); - break; - case CFI_endproc: - dot_cfi_endproc (); - break; - case CFA_def_cfa: - case CFA_def_cfa_register: - case CFA_def_cfa_offset: - case CFA_offset: - case CFA_register: - case CFI_adjust_cfa_offset: - cfi_make_insn (arg); - break; - case CFI_verbose: - if (cfi_parse_const (¶m) >= 0) - verbose = (int) param; - else - verbose = 1; - break; - default: - as_bad (_("unknown CFI code 0x%x (%s)"), arg, cfi_insn_str (arg)); - break; + as_bad (_("open CFI at the end of file; missing .cfi_endproc directive")); + cur_fde_data->end_address = cur_fde_data->start_address; } - ignore_rest_of_line (); -} -void -cfi_set_config (struct cfi_config *cfg) -{ - assert (cfg != NULL); - assert (cfg->addr_length > 0); + if (all_fde_data == 0) + return; - current_config = *cfg; -} + /* Open .eh_frame section. */ + cfi_seg = subseg_new (".eh_frame", 0); +#ifdef BFD_ASSEMBLER + bfd_set_section_flags (stdoutput, cfi_seg, + SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_READONLY); +#endif + subseg_set (cfi_seg, 0); + record_alignment (cfi_seg, EH_FRAME_ALIGNMENT); -void -cfi_finish (void) -{ - if (cfi_info) - as_bad (_("open CFI at the end of file; missing .cfi_endproc directive")); + /* Make sure check_eh_frame doesn't do anything with our output. */ + save_flag_traditional_format = flag_traditional_format; + flag_traditional_format = 1; + + for (fde = all_fde_data; fde ; fde = fde->next) + { + struct cfi_insn_data *first; + struct cie_entry *cie; + + cie = select_cie_for_fde (fde, &first); + output_fde (fde, cie, first, fde->next == NULL ? EH_FRAME_ALIGNMENT : 0); + } + + flag_traditional_format = save_flag_traditional_format; }