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| author | H.J. Lu <hjl.tools@gmail.com> | 2018-02-17 05:20:42 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2018-02-17 05:20:57 -0800 |
| commit | 62a02d25b6e5d9f92c205260daa11355d0c62532 (patch) | |
| tree | 9fa0855fa0acd81d5d855b01a865cdfb3456254a /gas/config/tc-i386.h | |
| parent | bb57c12e551e7b66db9d5d8623e2f294091f03c1 (diff) | |
| download | gdb-62a02d25b6e5d9f92c205260daa11355d0c62532.zip gdb-62a02d25b6e5d9f92c205260daa11355d0c62532.tar.gz gdb-62a02d25b6e5d9f92c205260daa11355d0c62532.tar.bz2 | |
Add .nop assembler directive
Implement the '.nop SIZE[, CONTROL]' assembler directive, which emits
SIZE bytes filled with no-op instructions. SIZE is absolute expression.
The optional CONTROL byte controls how no-op instructions should be
generated. If the comma and @var{control} are omitted, CONTROL is
assumed to be zero.
For Intel 80386 and AMD x86-64 targets, CONTROL byte specifies the size
limit of a single no-op instruction. The valid values of CONTROL byte
are between 0 and 8 for 16-bit mode, between 0 and 10 for 32-bit mode,
between 0 and 11 for 64-bit mode. When 0 is used, the no-op size limit
is set to the maximum supported size.
2 new relax states, rs_space_nop and rs_fill_nop, are added to enum
_relax_state, which are similar to rs_space and rs_fill, respectively,
but they fill with no-op instructions, instead of a single byte. A
target backend must override the default md_generate_nops to generate
proper no-op instructions. Otherwise, an error of unimplemented .nop
directive will be issued whenever .nop directive is used.
* NEWS: Mention .nop directive.
* as.h (_relax_state): Add rs_space_nop and rs_fill_nop.
* read.c (potable): Add .nop.
(s_nop): New function.
* read.h (s_nop): New prototype.
* write.c (cvt_frag_to_fill): Handle rs_space_nop and
rs_fill_nop.
(md_generate_nops): New function.
(relax_segment): Likewise.
(write_contents): Use md_generate_nops for rs_fill_nop.
* config/tc-i386.c (alt64_11): New.
(alt64_patt): Likewise.
(md_convert_frag): Handle rs_space_nop.
(i386_output_nops): New function.
(i386_generate_nops): Likewise.
(i386_align_code): Call i386_output_nops.
* config/tc-i386.h (i386_generate_nops): New.
(md_generate_nops): Likewise.
* doc/as.texinfo: Document .nop directive.
* testsuite/gas/i386/i386.exp: Run .nop directive tests.
* testsuite/gas/i386/nop-1.d: New file.
* testsuite/gas/i386/nop-1.s: Likewise.
* testsuite/gas/i386/nop-2.d: Likewise.
* testsuite/gas/i386/nop-2.s: Likewise.
* testsuite/gas/i386/nop-3.d: Likewise.
* testsuite/gas/i386/nop-3.s: Likewise.
* testsuite/gas/i386/nop-4.d: Likewise.
* testsuite/gas/i386/nop-4.s: Likewise.
* testsuite/gas/i386/nop-5.d: Likewise.
* testsuite/gas/i386/nop-5.s: Likewise.
* testsuite/gas/i386/nop-6.d: Likewise.
* testsuite/gas/i386/nop-6.s: Likewise.
* testsuite/gas/i386/nop-bad-1.l: Likewise.
* testsuite/gas/i386/nop-bad-1.s: Likewise.
* testsuite/gas/i386/x86-64-nop-1.d: Likewise.
* testsuite/gas/i386/x86-64-nop-2.d: Likewise.
* testsuite/gas/i386/x86-64-nop-3.d: Likewise.
* testsuite/gas/i386/x86-64-nop-4.d: Likewise.
* testsuite/gas/i386/x86-64-nop-5.d: Likewise.
* testsuite/gas/i386/x86-64-nop-6.d: Likewise.
Diffstat (limited to 'gas/config/tc-i386.h')
| -rw-r--r-- | gas/config/tc-i386.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/gas/config/tc-i386.h b/gas/config/tc-i386.h index 6e4f440..1250bc2 100644 --- a/gas/config/tc-i386.h +++ b/gas/config/tc-i386.h @@ -281,6 +281,11 @@ extern void sco_id (void); #define WORKING_DOT_WORD 1 +/* How to generate NOPs for .nop direct directive. */ +extern void i386_generate_nops (fragS *, char *, offsetT, int); +#define md_generate_nops(frag, where, amount, control) \ + i386_generate_nops ((frag), (where), (amount), (control)) + /* We want .cfi_* pseudo-ops for generating unwind info. */ #define TARGET_USE_CFIPOP 1 |