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* config/tc-ia64.h (md_elf_section_type): New macro.

Browse Source 
(ELF_TC_SPECIAL_SECTIONS): Drop .IA_64.unwind and .IA_64.unwind_info
        (they're now handled via ia64_elf_section_type.

        * config/tc-ia64.c (unwind): New members saved_text_seg,
        saved_text_subseg, and force_unwind_entry.
        (optimize_unw_records): New function to optimize away unnecessary
        unwind directives.
        (ia64_elf_section_type): New function.
        (output_unw_records): Generate unwind info only if the size is
        non-zero or if it's forced for some other reason (e.g.,
        handlerdata or a personality routine).
        (generate_unwind_image): Don't switch back to previous
        section---stay inside the unwind info section instead so that
        handlerdata that may follow goes into the right place.
        (dot_handlerdata): Force generation of unwind entry and save the
        current active text segment before generating unwind image.
        (dot_unwentry): Force generation of unwind entry.
        (dot_personality): Ditto.
        (dot_endp): Generate unwind table entry only if there is
        some unwind info or the unwind entry was forced.

        * config/tc-ia64.c (make_unw_section_name): New macro to form
        unwind section name.
        (generate_unwind_image): Add "text_name" argument.  Use it to
        form unwind section name.
        (dot_handlerdata): Determine current segment (section) name and
        pass it to generate_unwind_image().
        (dot_endp): Determine current segment (section) name and use
        it to determine the appropriate unwind section name.
        (ia64_md_do_align): Add missing ATTRIBUTE_UNUSED declarations to
        n, fill, and max arguments.
This commit is contained in:
Richard Henderson 2001-02-10 01:42:04 +00:00
parent 81545d45ad
commit 91a2ae2a30
3 changed files with 247 additions and 63 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
gas/ChangeLog
View File

@ -1,3 +1,38 @@
2001-02-08 David Mosberger <davidm@hpl.hp.com>
* config/tc-ia64.h (md_elf_section_type): New macro.
(ELF_TC_SPECIAL_SECTIONS): Drop .IA_64.unwind and .IA_64.unwind_info
(they're now handled via ia64_elf_section_type.
* config/tc-ia64.c (unwind): New members saved_text_seg,
saved_text_subseg, and force_unwind_entry.
(optimize_unw_records): New function to optimize away unnecessary
unwind directives.
(ia64_elf_section_type): New function.
(output_unw_records): Generate unwind info only if the size is
non-zero or if it's forced for some other reason (e.g.,
handlerdata or a personality routine).
(generate_unwind_image): Don't switch back to previous
section---stay inside the unwind info section instead so that
handlerdata that may follow goes into the right place.
(dot_handlerdata): Force generation of unwind entry and save the
current active text segment before generating unwind image.
(dot_unwentry): Force generation of unwind entry.
(dot_personality): Ditto.
(dot_endp): Generate unwind table entry only if there is
some unwind info or the unwind entry was forced.
* config/tc-ia64.c (make_unw_section_name): New macro to form
unwind section name.
(generate_unwind_image): Add "text_name" argument. Use it to
form unwind section name.
(dot_handlerdata): Determine current segment (section) name and
pass it to generate_unwind_image().
(dot_endp): Determine current segment (section) name and use
it to determine the appropriate unwind section name.
(ia64_md_do_align): Add missing ATTRIBUTE_UNUSED declarations to
n, fill, and max arguments.
2001-02-09 Schwidefsky <schwidefsky@de.ibm.com>
* Makefile.am: Add linux target for S/390.

267
gas/config/tc-ia64.c
View File

@ -1,5 +1,5 @@
/* tc-ia64.c -- Assembler for the HP/Intel IA-64 architecture.
Copyright (C) 1998, 1999, 2000 Free Software Foundation.
Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation.
Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
This file is part of GAS, the GNU Assembler.
@ -617,6 +617,9 @@ static struct
symbolS *proc_end;
symbolS *info; /* pointer to unwind info */
symbolS *personality_routine;
segT saved_text_seg;
subsegT saved_text_subseg;
unsigned int force_unwind_entry : 1; /* force generation of unwind entry? */
/* TRUE if processing unwind directives in a prologue region. */
int prologue;
@ -825,11 +828,28 @@ static void set_imask PARAMS ((unw_rec_list *, unsigned long, unsigned long, uns
static int count_bits PARAMS ((unsigned long));
static unsigned long slot_index PARAMS ((unsigned long, fragS *,
unsigned long, fragS *));
static unw_rec_list *optimize_unw_records PARAMS ((unw_rec_list *));
static void fixup_unw_records PARAMS ((unw_rec_list *));
static int output_unw_records PARAMS ((unw_rec_list *, void **));
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 int generate_unwind_image PARAMS ((void));
static int generate_unwind_image PARAMS ((const char *));
/* 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) \
{ \
char *_prefix = special_section_name[special]; \
size_t _prefix_len = strlen (_prefix), _text_len = strlen (text_name); \
char *_result = alloca (_prefix_len + _text_len + 1); \
memcpy(_result, _prefix, _prefix_len); \
memcpy(_result + _prefix_len, text_name, _text_len); \
_result[_prefix_len + _text_len] = '\0'; \
result = _result; \
} \
while (0)
/* Determine if application register REGNUM resides in the integer
unit (as opposed to the memory unit). */
@ -874,6 +894,22 @@ ia64_elf_section_flags (flags, attr, type)
return flags;
}
int
ia64_elf_section_type (str, len)
const char *str;
size_t len;
{
len = sizeof (ELF_STRING_ia64_unwind_info) - 1;
if (strncmp (str, ELF_STRING_ia64_unwind_info, len) == 0)
return SHT_PROGBITS;
len = sizeof (ELF_STRING_ia64_unwind) - 1;
if (strncmp (str, ELF_STRING_ia64_unwind, len) == 0)
return SHT_IA_64_UNWIND;
return -1;
}
static unsigned int
set_regstack (ins, locs, outs, rots)
unsigned int ins, locs, outs, rots;
@ -2495,6 +2531,25 @@ slot_index (slot_addr, slot_frag, first_addr, first_frag)
return index;
}
/* Optimize unwind record directives. */
static unw_rec_list *
optimize_unw_records (list)
unw_rec_list *list;
{
if (!list)
return NULL;
/* If the only unwind record is ".prologue" or ".prologue" followed
by ".body", then we can optimize the unwind directives away. */
if (list->r.type == prologue
&& (list->next == NULL
|| (list->next->r.type == body && list->next->next == NULL)))
return NULL;
return list;
}
/* Given a complete record list, process any records which have
unresolved fields, (ie length counts for a prologue). After
this has been run, all neccessary information should be available
@ -2681,6 +2736,9 @@ output_unw_records (list, ptr)
int size, x, extra = 0;
unsigned char *mem;
*ptr = NULL;
list = optimize_unw_records (list);
fixup_unw_records (list);
size = calc_record_size (list);
@ -2688,24 +2746,33 @@ output_unw_records (list, ptr)
x = size % 8;
if (x != 0)
extra = 8 - x;
/* Add 8 for the header + 8 more bytes for the personality offset. */
mem = xmalloc (size + extra + 16);
vbyte_mem_ptr = mem + 8;
/* Clear the padding area and personality. */
memset (mem + 8 + size, 0 , extra + 8);
/* Initialize the header area. */
md_number_to_chars (mem, (((bfd_vma) 1 << 48) /* version */
| (unwind.personality_routine
? ((bfd_vma) 3 << 32) /* U & E handler flags */
: 0)
| ((size + extra) / 8)), /* length (dwords) */
8);
if (size > 0 || unwind.force_unwind_entry)
{
unwind.force_unwind_entry = 0;
process_unw_records (list, output_vbyte_mem);
/* Add 8 for the header + 8 more bytes for the personality offset. */
mem = xmalloc (size + extra + 16);
*ptr = mem;
return size + extra + 16;
vbyte_mem_ptr = mem + 8;
/* Clear the padding area and personality. */
memset (mem + 8 + size, 0 , extra + 8);
/* Initialize the header area. */
md_number_to_chars (mem,
(((bfd_vma) 1 << 48) /* version */
| (unwind.personality_routine
? ((bfd_vma) 3 << 32) /* U & E handler flags */
: 0)
| ((size + extra) / 8)), /* length (dwords) */
8);
process_unw_records (list, output_vbyte_mem);
*ptr = mem;
size += extra + 16;
}
return size;
}
static int
@ -3053,7 +3120,8 @@ dot_restorereg_p (dummy)
}
static int
generate_unwind_image ()
generate_unwind_image (text_name)
const char *text_name;
{
int size;
unsigned char *unw_rec;
@ -3071,8 +3139,13 @@ generate_unwind_image ()
if (size != 0)
{
unsigned char *where;
char *sec_name;
expressionS exp;
set_section ((char *) special_section_name[SPECIAL_SECTION_UNWIND_INFO]);
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);
/* Make sure the section has 8 byte alignment. */
record_alignment (now_seg, 3);
@ -3088,6 +3161,7 @@ generate_unwind_image ()
/* Copy the information from the unwind record into this section. The
data is already in the correct byte order. */
memcpy (where, unw_rec, size);
/* Add the personality address to the image. */
if (unwind.personality_routine != 0)
{
@ -3098,7 +3172,6 @@ generate_unwind_image ()
&exp, 0, BFD_RELOC_IA64_LTOFF_FPTR64LSB);
unwind.personality_routine = 0;
}
obj_elf_previous (0);
}
free_list_records (unwind.list);
@ -3111,7 +3184,23 @@ static void
dot_handlerdata (dummy)
int dummy ATTRIBUTE_UNUSED;
{
generate_unwind_image ();
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 */
unwind.saved_text_seg = now_seg;
unwind.saved_text_subseg = now_subseg;
/* 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);
demand_empty_rest_of_line ();
}
@ -3119,6 +3208,7 @@ static void
dot_unwentry (dummy)
int dummy ATTRIBUTE_UNUSED;
{
unwind.force_unwind_entry = 1;
demand_empty_rest_of_line ();
}
@ -3583,6 +3673,7 @@ dot_personality (dummy)
c = get_symbol_end ();
p = input_line_pointer;
unwind.personality_routine = symbol_find_or_make (name);
unwind.force_unwind_entry = 1;
*p = c;
SKIP_WHITESPACE ();
demand_empty_rest_of_line ();
@ -3685,57 +3776,115 @@ dot_endp (dummy)
long where;
segT saved_seg;
subsegT saved_subseg;
const char *sec_name, *text_name;
saved_seg = now_seg;
saved_subseg = now_subseg;
if (unwind.saved_text_seg)
{
saved_seg = unwind.saved_text_seg;
saved_subseg = unwind.saved_text_subseg;
unwind.saved_text_seg = NULL;
}
else
{
saved_seg = now_seg;
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
_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 = "";
expression (&e);
demand_empty_rest_of_line ();
insn_group_break (1, 0, 0);
/* If there was a .handlerdata, we haven't generated an image yet. */
if (unwind.info == 0)
/* If there wasn't a .handlerdata, we haven't generated an image yet. */
if (!unwind.info)
generate_unwind_image (text_name);
if (unwind.info || unwind.force_unwind_entry)
{
generate_unwind_image ();
}
subseg_set (md.last_text_seg, 0);
unwind.proc_end = expr_build_dot ();
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);
set_section ((char *) special_section_name[SPECIAL_SECTION_UNWIND]);
/* Make sure the section has 8 byte alignment. */
record_alignment (now_seg, 3);
/* Make sure the section has 8 byte alignment. */
record_alignment (now_seg, 3);
ptr = frag_more (24);
where = frag_now_fix () - 24;
bytes_per_address = bfd_arch_bits_per_address (stdoutput) / 8;
ptr = frag_more (24);
where = frag_now_fix () - 24;
bytes_per_address = bfd_arch_bits_per_address (stdoutput) / 8;
/* Issue the values of a) Proc Begin, b) Proc End, c) Unwind Record. */
e.X_op = O_pseudo_fixup;
e.X_op_symbol = pseudo_func[FUNC_SEG_RELATIVE].u.sym;
e.X_add_number = 0;
e.X_add_symbol = unwind.proc_start;
ia64_cons_fix_new (frag_now, where, bytes_per_address, &e);
e.X_op = O_pseudo_fixup;
e.X_op_symbol = pseudo_func[FUNC_SEG_RELATIVE].u.sym;
e.X_add_number = 0;
e.X_add_symbol = unwind.proc_end;
ia64_cons_fix_new (frag_now, where + bytes_per_address, bytes_per_address, &e);
if (unwind.info != 0)
{
/* Issue the values of a) Proc Begin, b) Proc End, c) Unwind Record. */
e.X_op = O_pseudo_fixup;
e.X_op_symbol = pseudo_func[FUNC_SEG_RELATIVE].u.sym;
e.X_add_number = 0;
e.X_add_symbol = unwind.info;
ia64_cons_fix_new (frag_now, where + (bytes_per_address * 2), bytes_per_address, &e);
}
else
md_number_to_chars (ptr + (bytes_per_address * 2), 0, bytes_per_address);
e.X_add_symbol = unwind.proc_start;
ia64_cons_fix_new (frag_now, where, bytes_per_address, &e);
e.X_op = O_pseudo_fixup;
e.X_op_symbol = pseudo_func[FUNC_SEG_RELATIVE].u.sym;
e.X_add_number = 0;
e.X_add_symbol = unwind.proc_end;
ia64_cons_fix_new (frag_now, where + bytes_per_address,
bytes_per_address, &e);
if (unwind.info)
{
e.X_op = O_pseudo_fixup;
e.X_op_symbol = pseudo_func[FUNC_SEG_RELATIVE].u.sym;
e.X_add_number = 0;
e.X_add_symbol = unwind.info;
ia64_cons_fix_new (frag_now, where + (bytes_per_address * 2),
bytes_per_address, &e);
}
else
md_number_to_chars (ptr + (bytes_per_address * 2), 0,
bytes_per_address);
}
subseg_set (saved_seg, saved_subseg);
unwind.proc_start = unwind.proc_end = unwind.info = 0;
}
@ -9791,10 +9940,10 @@ md_section_align (seg, size)
void
ia64_md_do_align (n, fill, len, max)
int n;
const char *fill;
int n ATTRIBUTE_UNUSED;
const char *fill ATTRIBUTE_UNUSED;
int len ATTRIBUTE_UNUSED;
int max;
int max ATTRIBUTE_UNUSED;
{
if (subseg_text_p (now_seg))
ia64_flush_insns ();

8
gas/config/tc-ia64.h
View File

@ -1,5 +1,5 @@
/* tc-ia64.h -- Header file for tc-ia64.c.
Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
This file is part of GAS, the GNU Assembler.
@ -82,6 +82,7 @@ extern void ia64_cons_fix_new PARAMS ((fragS *f, int where, int nbytes,
extern void ia64_validate_fix PARAMS ((struct fix *fix));
extern char * ia64_canonicalize_symbol_name PARAMS ((char *));
extern flagword ia64_elf_section_flags PARAMS ((flagword, int, int));
extern int ia64_elf_section_type PARAMS ((const char *, size_t len));
extern long ia64_pcrel_from_section PARAMS ((struct fix *fix, segT sec));
extern void ia64_md_do_align PARAMS ((int, const char *, int, int));
extern void ia64_handle_align PARAMS ((fragS *f));
@ -111,6 +112,7 @@ extern void ia64_handle_align PARAMS ((fragS *f));
#define MD_PCREL_FROM_SECTION(fix,sec) ia64_pcrel_from_section (fix, sec)
#define md_do_align(n,f,l,m,j) ia64_md_do_align (n,f,l,m)
#define HANDLE_ALIGN(f) ia64_handle_align (f)
#define md_elf_section_type(str,len) ia64_elf_section_type (str, len)
#define MAX_MEM_FOR_RS_ALIGN_CODE (15 + 16)
@ -121,9 +123,7 @@ extern void ia64_handle_align PARAMS ((fragS *f));
#define ELF_TC_SPECIAL_SECTIONS \
{ ".sbss", SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_IA_64_SHORT }, \
{ ".sdata", SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_IA_64_SHORT }, \
{ ".IA_64.unwind", SHT_IA_64_UNWIND, SHF_ALLOC }, \
{ ".IA_64.unwind_info", SHT_PROGBITS, SHF_ALLOC },
{ ".sdata", SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_IA_64_SHORT },
#define DWARF2_LINE_MIN_INSN_LENGTH 1 /* so slot-multipliers can be 1 */