diff options
Diffstat (limited to 'gas/config')
| -rw-r--r-- | gas/config/tc-ia64.c | 214 |
1 files changed, 119 insertions, 95 deletions
diff --git a/gas/config/tc-ia64.c b/gas/config/tc-ia64.c index f5526c9..c5c35ef 100644 --- a/gas/config/tc-ia64.c +++ b/gas/config/tc-ia64.c @@ -571,11 +571,6 @@ static char special_section_name[][20] = {".init_array"}, {".fini_array"} }; -static char *special_linkonce_name[] = - { - ".gnu.linkonce.ia64unw.", ".gnu.linkonce.ia64unwi." - }; - /* The best template for a particular sequence of up to three instructions: */ #define N IA64_NUM_TYPES @@ -908,36 +903,10 @@ static unw_rec_list *optimize_unw_records PARAMS ((unw_rec_list *)); static void fixup_unw_records PARAMS ((unw_rec_list *, int)); static int convert_expr_to_ab_reg PARAMS ((expressionS *, unsigned int *, unsigned int *)); static int convert_expr_to_xy_reg PARAMS ((expressionS *, unsigned int *, unsigned int *)); -static void generate_unwind_image PARAMS ((const char *)); static unsigned int get_saved_prologue_count PARAMS ((unsigned long)); static void save_prologue_count PARAMS ((unsigned long, unsigned int)); static void free_saved_prologue_counts PARAMS ((void)); -/* Build the unwind section name by appending the (possibly stripped) - text section NAME to the unwind PREFIX. The resulting string - pointer is assigned to RESULT. The string is allocated on the - stack, so this must be a macro... */ -#define make_unw_section_name(special, text_name, result) \ - { \ - const char *_prefix = special_section_name[special]; \ - const char *_suffix = text_name; \ - size_t _prefix_len, _suffix_len; \ - char *_result; \ - if (strncmp (text_name, ".gnu.linkonce.t.", \ - sizeof (".gnu.linkonce.t.") - 1) == 0) \ - { \ - _prefix = special_linkonce_name[special - SPECIAL_SECTION_UNWIND]; \ - _suffix += sizeof (".gnu.linkonce.t.") - 1; \ - } \ - _prefix_len = strlen (_prefix), _suffix_len = strlen (_suffix); \ - _result = alloca (_prefix_len + _suffix_len + 1); \ - memcpy (_result, _prefix, _prefix_len); \ - memcpy (_result + _prefix_len, _suffix, _suffix_len); \ - _result[_prefix_len + _suffix_len] = '\0'; \ - result = _result; \ - } \ -while (0) - /* Determine if application register REGNUM resides in the integer unit (as opposed to the memory unit). */ static int @@ -3315,9 +3284,122 @@ dot_restorereg_p (dummy) add_unwind_entry (output_spill_reg_p (ab, reg, 0, 0, qp)); } +static char *special_linkonce_name[] = + { + ".gnu.linkonce.ia64unw.", ".gnu.linkonce.ia64unwi." + }; + static void -generate_unwind_image (text_name) - const char *text_name; +start_unwind_section (const segT text_seg, int sec_index) +{ + /* + Use a slightly ugly scheme to derive the unwind section names from + the text section name: + + text sect. unwind table sect. + name: name: comments: + ---------- ----------------- -------------------------------- + .text .IA_64.unwind + .text.foo .IA_64.unwind.text.foo + .foo .IA_64.unwind.foo + .gnu.linkonce.t.foo + .gnu.linkonce.ia64unw.foo + _info .IA_64.unwind_info gas issues error message (ditto) + _infoFOO .IA_64.unwind_infoFOO gas issues error message (ditto) + + This mapping is done so that: + + (a) An object file with unwind info only in .text will use + unwind section names .IA_64.unwind and .IA_64.unwind_info. + This follows the letter of the ABI and also ensures backwards + compatibility with older toolchains. + + (b) An object file with unwind info in multiple text sections + will use separate unwind sections for each text section. + This allows us to properly set the "sh_info" and "sh_link" + fields in SHT_IA_64_UNWIND as required by the ABI and also + lets GNU ld support programs with multiple segments + containing unwind info (as might be the case for certain + embedded applications). + + (c) An error is issued if there would be a name clash. + */ + + const char *text_name, *sec_text_name; + char *sec_name; + const char *prefix = special_section_name [sec_index]; + const char *suffix; + size_t prefix_len, suffix_len, sec_name_len; + + sec_text_name = segment_name (text_seg); + text_name = sec_text_name; + if (strncmp (text_name, "_info", 5) == 0) + { + as_bad ("Illegal section name `%s' (causes unwind section name clash)", + text_name); + ignore_rest_of_line (); + return; + } + if (strcmp (text_name, ".text") == 0) + text_name = ""; + + /* Build the unwind section name by appending the (possibly stripped) + text section name to the unwind prefix. */ + suffix = text_name; + if (strncmp (text_name, ".gnu.linkonce.t.", + sizeof (".gnu.linkonce.t.") - 1) == 0) + { + prefix = special_linkonce_name [sec_index - SPECIAL_SECTION_UNWIND]; + suffix += sizeof (".gnu.linkonce.t.") - 1; + } + + prefix_len = strlen (prefix); + suffix_len = strlen (suffix); + sec_name_len = prefix_len + suffix_len; + sec_name = alloca (sec_name_len + 1); + memcpy (sec_name, prefix, prefix_len); + memcpy (sec_name + prefix_len, suffix, suffix_len); + sec_name [sec_name_len] = '\0'; + + /* Handle COMDAT group. */ + if (suffix == text_name && (text_seg->flags & SEC_LINK_ONCE) != 0) + { + char *section; + size_t len, group_name_len; + const char *group_name = elf_group_name (text_seg); + + if (group_name == NULL) + { + as_bad ("Group section `%s' has no group signature", + sec_text_name); + ignore_rest_of_line (); + return; + } + /* We have to construct a fake section directive. */ + group_name_len = strlen (group_name); + len = (sec_name_len + + 16 /* ,"aG",@progbits, */ + + group_name_len /* ,group_name */ + + 7); /* ,comdat */ + + section = alloca (len + 1); + memcpy (section, sec_name, sec_name_len); + memcpy (section + sec_name_len, ",\"aG\",@progbits,", 16); + memcpy (section + sec_name_len + 16, group_name, group_name_len); + memcpy (section + len - 7, ",comdat", 7); + section [len] = '\0'; + set_section (section); + } + else + { + set_section (sec_name); + bfd_set_section_flags (stdoutput, now_seg, + SEC_LOAD | SEC_ALLOC | SEC_READONLY); + } +} + +static void +generate_unwind_image (const segT text_seg) { int size, pad; unw_rec_list *list; @@ -3350,14 +3432,10 @@ generate_unwind_image (text_name) /* If there are unwind records, switch sections, and output the info. */ if (size != 0) { - char *sec_name; expressionS exp; bfd_reloc_code_real_type reloc; - make_unw_section_name (SPECIAL_SECTION_UNWIND_INFO, text_name, sec_name); - set_section (sec_name); - bfd_set_section_flags (stdoutput, now_seg, - SEC_LOAD | SEC_ALLOC | SEC_READONLY); + start_unwind_section (text_seg, SPECIAL_SECTION_UNWIND_INFO); /* Make sure the section has 4 byte alignment for ILP32 and 8 byte alignment for LP64. */ @@ -3406,13 +3484,6 @@ static void dot_handlerdata (dummy) int dummy ATTRIBUTE_UNUSED; { - const char *text_name = segment_name (now_seg); - - /* If text section name starts with ".text" (which it should), - strip this prefix off. */ - if (strcmp (text_name, ".text") == 0) - text_name = ""; - unwind.force_unwind_entry = 1; /* Remember which segment we're in so we can switch back after .endp */ @@ -3422,7 +3493,7 @@ dot_handlerdata (dummy) /* Generate unwind info into unwind-info section and then leave that section as the currently active one so dataXX directives go into the language specific data area of the unwind info block. */ - generate_unwind_image (text_name); + generate_unwind_image (now_seg); demand_empty_rest_of_line (); } @@ -4057,7 +4128,6 @@ dot_endp (dummy) long where; segT saved_seg; subsegT saved_subseg; - const char *sec_name, *text_name; char *name, *p, c; symbolS *sym; @@ -4073,64 +4143,18 @@ dot_endp (dummy) saved_subseg = now_subseg; } - /* - Use a slightly ugly scheme to derive the unwind section names from - the text section name: - - text sect. unwind table sect. - name: name: comments: - ---------- ----------------- -------------------------------- - .text .IA_64.unwind - .text.foo .IA_64.unwind.text.foo - .foo .IA_64.unwind.foo - .gnu.linkonce.t.foo - .gnu.linkonce.ia64unw.foo - _info .IA_64.unwind_info gas issues error message (ditto) - _infoFOO .IA_64.unwind_infoFOO gas issues error message (ditto) - - This mapping is done so that: - - (a) An object file with unwind info only in .text will use - unwind section names .IA_64.unwind and .IA_64.unwind_info. - This follows the letter of the ABI and also ensures backwards - compatibility with older toolchains. - - (b) An object file with unwind info in multiple text sections - will use separate unwind sections for each text section. - This allows us to properly set the "sh_info" and "sh_link" - fields in SHT_IA_64_UNWIND as required by the ABI and also - lets GNU ld support programs with multiple segments - containing unwind info (as might be the case for certain - embedded applications). - - (c) An error is issued if there would be a name clash. - */ - text_name = segment_name (saved_seg); - if (strncmp (text_name, "_info", 5) == 0) - { - as_bad ("Illegal section name `%s' (causes unwind section name clash)", - text_name); - ignore_rest_of_line (); - return; - } - if (strcmp (text_name, ".text") == 0) - text_name = ""; - insn_group_break (1, 0, 0); /* If there wasn't a .handlerdata, we haven't generated an image yet. */ if (!unwind.info) - generate_unwind_image (text_name); + generate_unwind_image (saved_seg); if (unwind.info || unwind.force_unwind_entry) { subseg_set (md.last_text_seg, 0); unwind.proc_end = expr_build_dot (); - make_unw_section_name (SPECIAL_SECTION_UNWIND, text_name, sec_name); - set_section ((char *) sec_name); - bfd_set_section_flags (stdoutput, now_seg, - SEC_LOAD | SEC_ALLOC | SEC_READONLY); + start_unwind_section (saved_seg, SPECIAL_SECTION_UNWIND); /* Make sure that section has 4 byte alignment for ILP32 and 8 byte alignment for LP64. */ |