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Add support to the RX toolchain to restrict the use of string instructions. 

bfd	* elf32-rx.c (describe_flags): Report the settings of the string
	insn using bits.
	(rx_elf_merge_private_bfd_data): Handle merging of the string insn
	using bits.

bin	* readelf.c (get_machine_flags): Report the setting of the string
	insn using bits.

gas	* config/tc-rx.c (enum options): Add OPTION_DISALLOW_STRING_INSNS.
	(md_longopts): Add -mno-allow-string-insns.
	(md_parse_option): Handle -mno-allow-string-insns.
	(md_show_usage): Mention -mno-allow-string-insns.
	(rx_note_string_insn_use): New function.  Produces an error
	message if a string insn is used when it is not allowed.
	* config/rx-parse.y (SCMPU): Call rx_note_string_insn_use.
	(SMOVU, SMOVB, SMOVF, SUNTIL, SWHILE, RMPA): Likewise.
	* config/rx-defs.h (rx_note_string_insn_use): Prototype.
	* doc/c-rx.texi: Document -mno-allow-string-insns.

elf	* rx.h (E_FLAG_RX_SINSNS_SET): New bit in e_flags field.
	(E_FLAG_RX_SINSNS_YES): Likewise.
	(E_FLAG_RX_SINSNS_MASK): New define.
This commit is contained in:
Nick Clifton 2015-04-09 12:48:37 +01:00
parent 5a2d4533e2
commit 3525236c57
11 changed files with 96 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
bfd/ChangeLog
View File

@ -1,3 +1,10 @@
2015-04-09 Nick Clifton <nickc@redhat.com>
* elf32-rx.c (describe_flags): Report the settings of the string
insn using bits.
(rx_elf_merge_private_bfd_data): Handle merging of the string insn
using bits.
2015-04-08 H.J. Lu <hongjiu.lu@intel.com>
* compress.c (bfd_compress_section_contents): Work around a GCC

19
bfd/elf32-rx.c
View File

@ -3086,6 +3086,9 @@ describe_flags (flagword flags)
else
strcat (buf, ", GCC ABI");
if (flags & E_FLAG_RX_SINSNS_SET)
strcat (buf, flags & E_FLAG_RX_SINSNS_YES ? ", uses String instructions" : ", bans String instructions");
return buf;
}
@ -3112,8 +3115,22 @@ rx_elf_merge_private_bfd_data (bfd * ibfd, bfd * obfd)
{
flagword known_flags;
if (old_flags & E_FLAG_RX_SINSNS_SET)
{
if ((new_flags & E_FLAG_RX_SINSNS_SET) == 0)
{
new_flags &= ~ E_FLAG_RX_SINSNS_MASK;
new_flags |= (old_flags & E_FLAG_RX_SINSNS_MASK);
}
}
else if (new_flags & E_FLAG_RX_SINSNS_SET)
{
old_flags &= ~ E_FLAG_RX_SINSNS_MASK;
old_flags |= (new_flags & E_FLAG_RX_SINSNS_MASK);
}
known_flags = E_FLAG_RX_ABI | E_FLAG_RX_64BIT_DOUBLES
| E_FLAG_RX_DSP | E_FLAG_RX_PID;
| E_FLAG_RX_DSP | E_FLAG_RX_PID | E_FLAG_RX_SINSNS_MASK;
if ((old_flags ^ new_flags) & known_flags)
{

5
binutils/ChangeLog
View File

@ -1,3 +1,8 @@
2015-04-09 Nick Clifton <nickc@redhat.com>
* readelf.c (get_machine_flags): Report the setting of the string
insn using bits.
2015-04-08 H.J. Lu <hongjiu.lu@intel.com>
* objcopy.c (do_debug_sections): Add compress_zlib,

3
binutils/readelf.c
View File

@ -3274,6 +3274,9 @@ get_machine_flags (unsigned e_flags, unsigned e_machine)
strcat (buf, ", pid");
if (e_flags & E_FLAG_RX_ABI)
strcat (buf, ", RX ABI");
if (e_flags & E_FLAG_RX_SINSNS_SET)
strcat (buf, e_flags & E_FLAG_RX_SINSNS_YES
? ", uses String instructions" : ", bans String instructions");
break;
case EM_S390:

13
gas/ChangeLog
View File

@ -1,3 +1,16 @@
2015-04-09 Nick Clifton <nickc@redhat.com>
* config/tc-rx.c (enum options): Add OPTION_DISALLOW_STRING_INSNS.
(md_longopts): Add -mno-allow-string-insns.
(md_parse_option): Handle -mno-allow-string-insns.
(md_show_usage): Mention -mno-allow-string-insns.
(rx_note_string_insn_use): New function. Produces an error
message if a string insn is used when it is not allowed.
* config/rx-parse.y (SCMPU): Call rx_note_string_insn_use.
(SMOVU, SMOVB, SMOVF, SUNTIL, SWHILE, RMPA): Likewise.
* config/rx-defs.h (rx_note_string_insn_use): Prototype.
* doc/c-rx.texi: Document -mno-allow-string-insns.
2015-04-08 H.J. Lu <hongjiu.lu@intel.com>
* as.c (show_usage): Update --compress-debug-sections.

1
gas/config/rx-defs.h
View File

@ -62,6 +62,7 @@ extern void rx_linkrelax_imm (int);
extern void rx_linkrelax_branch (void);
extern int rx_parse (void);
extern int rx_wrap (void);
extern void rx_note_string_insn_use (void);
extern char * rx_lex_start;
extern char * rx_lex_end;

14
gas/config/rx-parse.y
View File

@ -500,27 +500,27 @@ statement :
/* ---------------------------------------------------------------------- */
| SCMPU
{ B2 (0x7f, 0x83); }
{ B2 (0x7f, 0x83); rx_note_string_insn_use (); }
| SMOVU
{ B2 (0x7f, 0x87); }
{ B2 (0x7f, 0x87); rx_note_string_insn_use (); }
| SMOVB
{ B2 (0x7f, 0x8b); }
{ B2 (0x7f, 0x8b); rx_note_string_insn_use (); }
| SMOVF
{ B2 (0x7f, 0x8f); }
{ B2 (0x7f, 0x8f); rx_note_string_insn_use (); }
/* ---------------------------------------------------------------------- */
| SUNTIL bwl
{ B2 (0x7f, 0x80); F ($2, 14, 2); }
{ B2 (0x7f, 0x80); F ($2, 14, 2); rx_note_string_insn_use (); }
| SWHILE bwl
{ B2 (0x7f, 0x84); F ($2, 14, 2); }
{ B2 (0x7f, 0x84); F ($2, 14, 2); rx_note_string_insn_use (); }
| SSTR bwl
{ B2 (0x7f, 0x88); F ($2, 14, 2); }
/* ---------------------------------------------------------------------- */
| RMPA bwl
{ B2 (0x7f, 0x8c); F ($2, 14, 2); }
{ B2 (0x7f, 0x8c); F ($2, 14, 2); rx_note_string_insn_use (); }
/* ---------------------------------------------------------------------- */

17
gas/config/tc-rx.c
View File

@ -73,6 +73,7 @@ enum options
OPTION_USES_GCC_ABI,
OPTION_USES_RX_ABI,
OPTION_CPU,
OPTION_DISALLOW_STRING_INSNS,
};
#define RX_SHORTOPTS ""
@ -99,7 +100,8 @@ struct option md_longopts[] =
{"mint-register", required_argument, NULL, OPTION_INT_REGS},
{"mgcc-abi", no_argument, NULL, OPTION_USES_GCC_ABI},
{"mrx-abi", no_argument, NULL, OPTION_USES_RX_ABI},
{"mcpu",required_argument,NULL,OPTION_CPU},
{"mcpu", required_argument, NULL, OPTION_CPU},
{"mno-allow-string-insns", no_argument, NULL, OPTION_DISALLOW_STRING_INSNS},
{NULL, no_argument, NULL, 0}
};
size_t md_longopts_size = sizeof (md_longopts);
@ -173,6 +175,10 @@ md_parse_option (int c ATTRIBUTE_UNUSED, char * arg ATTRIBUTE_UNUSED)
break;
}
return 1;
case OPTION_DISALLOW_STRING_INSNS:
elf_flags |= E_FLAG_RX_SINSNS_SET | E_FLAG_RX_SINSNS_NO;
return 1;
}
return 0;
}
@ -192,6 +198,7 @@ md_show_usage (FILE * stream)
fprintf (stream, _(" --mpid\n"));
fprintf (stream, _(" --mint-register=<value>\n"));
fprintf (stream, _(" --mcpu=<rx100|rx200|rx600|rx610>\n"));
fprintf (stream, _(" --mno-allow-string-insns"));
}
static void
@ -2623,6 +2630,14 @@ tc_gen_reloc (asection * sec ATTRIBUTE_UNUSED, fixS * fixp)
return reloc;
}
void
rx_note_string_insn_use (void)
{
if ((elf_flags & E_FLAG_RX_SINSNS_MASK) == (E_FLAG_RX_SINSNS_SET | E_FLAG_RX_SINSNS_NO))
as_bad (_("Use of an RX string instruction detected in a file being assembled without string instruction support"));
elf_flags |= E_FLAG_RX_SINSNS_SET | E_FLAG_RX_SINSNS_YES;
}
/* Set the ELF specific flags. */
void

15
gas/doc/c-rx.texi
View File

@ -112,6 +112,21 @@ This option tells the assembler the target CPU type. Currently the
cpu names. Attempting to assemble an instruction not supported by the
indicated cpu type will result in an error message being generated.
@cindex @samp{-mno-allow-string-insns}
@item -mno-allow-string-insns
This option tells the assembler to mark the object file that it is
building as one that does not use the string instructions
@code{SMOVF}, @code{SCMPU}, @code {SMOVB}, @code{SMOVU}, @code{SUNTIL}
@code {SWHILE} or the @code {RMPA} instruction. In addition the mark
tells the linker to complain if an attempt is made to link the binary
with another one that does use any of these instructions.
Note - the inverse of this option, @code{-mallow-string-insns}, is
not needed. The assembler automatically detects the use of the
the instructions in the source code and labels the resulting
object file appropriately. If no string instructions are detected
then the object file is labelled as being one that can be linked with
either string-using or string-banned object files.
@end table
@node RX-Modifiers

6
include/elf/ChangeLog
View File

@ -1,3 +1,9 @@
2015-04-09 Nick Clifton <nickc@redhat.com>
* rx.h (E_FLAG_RX_SINSNS_SET): New bit in e_flags field.
(E_FLAG_RX_SINSNS_YES): Likewise.
(E_FLAG_RX_SINSNS_MASK): New define.
2015-04-03 H.J. Lu <hongjiu.lu@intel.com>
* external.h (Elf32_External_Chdr): New.

5
include/elf/rx.h
View File

@ -120,6 +120,11 @@ END_RELOC_NUMBERS (R_RX_max)
#define E_FLAG_RX_PID (1 << 2) /* Unofficial - DJ */
#define E_FLAG_RX_ABI (1 << 3) /* Binary passes stacked arguments using natural alignment. Unofficial - NC. */
#define E_FLAG_RX_SINSNS_SET (1 << 6) /* Set if bit-5 is significant. */
#define E_FLAG_RX_SINSNS_YES (1 << 7) /* Set if string instructions are used in the binary. */
#define E_FLAG_RX_SINSNS_NO 0 /* Bit-5 if this binary must not be linked with a string instruction using binary. */
#define E_FLAG_RX_SINSNS_MASK (3 << 6) /* Mask of bits used to determine string instruction use. */
/* These define the addend field of R_RX_RH_RELAX relocations. */
#define RX_RELAXA_IMM6 0x00000010 /* Imm8/16/24/32 at bit offset 6. */
#define RX_RELAXA_IMM12 0x00000020 /* Imm8/16/24/32 at bit offset 12. */