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MSP420 assembler: Add -m{u,U} options to enable/disable NOP warnings for unknown interrupt state changes

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gas	* config/tc-msp430.c (options): New OPTION_UNKNOWN_INTR_NOPS,
	OPTION_NO_UNKNOWN_INTR_NOPS and do_unknown_interrupt_nops.
	(md_parse_option): Handle OPTION_UNKNOWN_INTR_NOPS and
	OPTION_NO_UNKNOWN_INTR_NOPS by setting do_unknown_interrupt_nops
	accordingly.
	(md_show_usage): Likewise.
	(md_shortopts): Add "mu" for OPTION_UNKNOWN_INTR_NOPS and
	"mU" for OPTION_NO_UNKNOWN_INTR_NOPS.
	(md_longopts): Likewise.
	(warn_eint_nop): Update comment.
	(warn_unsure_interrupt): Don't warn if prev_insn_is_nop or
	prev_insn_is_dint or we are assembling for 430 ISA.
	(msp430_operands): Only call warn_unsure_interrupt if
	do_unknown_interrupt_nops == TRUE.
	* testsuite/gas/msp430/nop-unknown-intr.s: New test source file.
	* testsuite/gas/msp430/nop-unknown-intr-430.d: New test.
	* testsuite/gas/msp430/nop-unknown-intr-430x.d: New test.
	* testsuite/gas/msp430/nop-unknown-intr-430x-ignore.d: New test.
	* testsuite/gas/msp430/nop-unknown-intr-430.l: Warning output for new
	test.
	* testsuite/gas/msp430/nop-unknown-intr-430x.l: Likewise.
	* testsuite/gas/msp430/msp430.exp: Add new tests to driver.
This commit is contained in:
Jozef Lawrynowicz 2019-04-17 15:01:28 +01:00 committed by Nick Clifton
parent a12e57448e
commit d557977487
13 changed files with 198 additions and 10 deletions
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25
gas/ChangeLog
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@ -1,3 +1,28 @@
2019-04-17 Jozef Lawrynowicz <jozef.l@mittosystems.com>
* config/tc-msp430.c (options): New OPTION_UNKNOWN_INTR_NOPS,
OPTION_NO_UNKNOWN_INTR_NOPS and do_unknown_interrupt_nops.
(md_parse_option): Handle OPTION_UNKNOWN_INTR_NOPS and
OPTION_NO_UNKNOWN_INTR_NOPS by setting do_unknown_interrupt_nops
accordingly.
(md_show_usage): Likewise.
(md_shortopts): Add "mu" for OPTION_UNKNOWN_INTR_NOPS and
"mU" for OPTION_NO_UNKNOWN_INTR_NOPS.
(md_longopts): Likewise.
(warn_eint_nop): Update comment.
(warn_unsure_interrupt): Don't warn if prev_insn_is_nop or
prev_insn_is_dint or we are assembling for 430 ISA.
(msp430_operands): Only call warn_unsure_interrupt if
do_unknown_interrupt_nops == TRUE.
* testsuite/gas/msp430/nop-unknown-intr.s: New test source file.
* testsuite/gas/msp430/nop-unknown-intr-430.d: New test.
* testsuite/gas/msp430/nop-unknown-intr-430x.d: New test.
* testsuite/gas/msp430/nop-unknown-intr-430x-ignore.d: New test.
* testsuite/gas/msp430/nop-unknown-intr-430.l: Warning output for new
test.
* testsuite/gas/msp430/nop-unknown-intr-430x.l: Likewise.
* testsuite/gas/msp430/msp430.exp: Add new tests to driver.
2019-04-16 Alan Modra <amodra@gmail.com>
* testsuite/gas/all/weakref1.d: xfail nds32.

45
gas/config/tc-msp430.c
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@ -680,6 +680,9 @@ static bfd_boolean gen_interrupt_nops = FALSE;
#define OPTION_WARN_INTR_NOPS 'y'
#define OPTION_NO_WARN_INTR_NOPS 'Y'
static bfd_boolean warn_interrupt_nops = TRUE;
#define OPTION_UNKNOWN_INTR_NOPS 'u'
#define OPTION_NO_UNKNOWN_INTR_NOPS 'U'
static bfd_boolean do_unknown_interrupt_nops = TRUE;
#define OPTION_MCPU 'c'
#define OPTION_MOVE_DATA 'd'
static bfd_boolean move_data = FALSE;
@ -1454,6 +1457,13 @@ md_parse_option (int c, const char * arg)
warn_interrupt_nops = FALSE;
return 1;
case OPTION_UNKNOWN_INTR_NOPS:
do_unknown_interrupt_nops = TRUE;
return 1;
case OPTION_NO_UNKNOWN_INTR_NOPS:
do_unknown_interrupt_nops = FALSE;
return 1;
case OPTION_MOVE_DATA:
move_data = TRUE;
return 1;
@ -1484,13 +1494,16 @@ static void
msp430_make_init_symbols (const char * name)
{
if (strncmp (name, ".bss", 4) == 0
|| strncmp (name, ".lower.bss", 10) == 0
|| strncmp (name, ".either.bss", 11) == 0
|| strncmp (name, ".gnu.linkonce.b.", 16) == 0)
(void) symbol_find_or_make ("__crt0_init_bss");
if (strncmp (name, ".data", 5) == 0
|| strncmp (name, ".lower.data", 11) == 0
|| strncmp (name, ".either.data", 12) == 0
|| strncmp (name, ".gnu.linkonce.d.", 16) == 0)
(void) symbol_find_or_make ("__crt0_movedata");
/* Note - data assigned to the .either.data section may end up being
placed in the .upper.data section if the .lower.data section is
full. Hence the need to define the crt0 symbol.
@ -1574,7 +1587,7 @@ const pseudo_typeS md_pseudo_table[] =
{NULL, NULL, 0}
};
const char *md_shortopts = "mm:,mP,mQ,ml,mN,mn,my,mY";
const char *md_shortopts = "mm:,mP,mQ,ml,mN,mn,my,mY,mu,mU";
struct option md_longopts[] =
{
@ -1589,6 +1602,8 @@ struct option md_longopts[] =
{"mn", no_argument, NULL, OPTION_INTR_NOPS},
{"mY", no_argument, NULL, OPTION_NO_WARN_INTR_NOPS},
{"my", no_argument, NULL, OPTION_WARN_INTR_NOPS},
{"mu", no_argument, NULL, OPTION_UNKNOWN_INTR_NOPS},
{"mU", no_argument, NULL, OPTION_NO_UNKNOWN_INTR_NOPS},
{"md", no_argument, NULL, OPTION_MOVE_DATA},
{"mdata-region", required_argument, NULL, OPTION_DATA_REGION},
{NULL, no_argument, NULL, 0}
@ -1620,6 +1635,13 @@ md_show_usage (FILE * stream)
_(" -mY - do not warn about missing NOPs after changing interrupts\n"));
fprintf (stream,
_(" -my - warn about missing NOPs after changing interrupts (default)\n"));
fprintf (stream,
_(" -mU - for an instruction which changes interrupt state, but where it is not\n"
" known how the state is changed, do not warn/insert NOPs\n"));
fprintf (stream,
_(" -mu - for an instruction which changes interrupt state, but where it is not\n"
" known how the state is changed, warn/insert NOPs (default)\n"
" -mn and/or -my are required for this to have any effect\n"));
fprintf (stream,
_(" -md - Force copying of data from ROM to RAM at startup\n"));
fprintf (stream,
@ -2536,7 +2558,8 @@ static void
warn_eint_nop (bfd_boolean prev_insn_is_nop, bfd_boolean prev_insn_is_dint)
{
if (prev_insn_is_nop
/* Prevent double warning for DINT immediately before EINT. */
/* If the last insn was a DINT, we will have already warned that a NOP is
required after it. */
|| prev_insn_is_dint
/* 430 ISA does not require a NOP before EINT. */
|| (! target_is_430x ()))
@ -2554,10 +2577,16 @@ warn_eint_nop (bfd_boolean prev_insn_is_nop, bfd_boolean prev_insn_is_dint)
/* Use when unsure what effect the insn will have on the interrupt status,
to insert/warn about adding a NOP before the current insn. */
static void
warn_unsure_interrupt (void)
warn_unsure_interrupt (bfd_boolean prev_insn_is_nop,
bfd_boolean prev_insn_is_dint)
{
/* Since this could enable or disable interrupts, need to add/warn about
adding a NOP before and after this insn. */
if (prev_insn_is_nop
/* If the last insn was a DINT, we will have already warned that a NOP is
required after it. */
|| prev_insn_is_dint
/* 430 ISA does not require a NOP before EINT or DINT. */
|| (! target_is_430x ()))
return;
if (gen_interrupt_nops)
{
gen_nop ();
@ -3646,12 +3675,12 @@ msp430_operands (struct msp430_opcode_s * opcode, char * line)
else if (op1.mode == OP_REG
&& (op1.reg == 2 || op1.reg == 3))
this_insn_is_dint = TRUE;
else
else if (do_unknown_interrupt_nops)
{
/* FIXME: Couldn't work out whether the insn is enabling or
disabling interrupts, so for safety need to treat it as both
a DINT and EINT. */
warn_unsure_interrupt ();
warn_unsure_interrupt (prev_insn_is_nop, prev_insn_is_dint);
check_for_nop |= NOP_CHECK_INTERRUPT;
}
}

9
gas/testsuite/gas/msp430/either-data-bss-sym.d Normal file
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@ -0,0 +1,9 @@
#objdump: -t
#name: Check symbols to initialise data and bss have been defined for .either sections
#...
.*__crt0_movedata.*
.*__crt0_move_highdata.*
#...
.*__crt0_init_bss.*
.*__crt0_init_highbss.*
#pass

24
gas/testsuite/gas/msp430/either-data-bss-sym.s Normal file
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@ -0,0 +1,24 @@
.file "main.c"
.text
.global a
.section .either.data,"aw"
.balign 2
.type a, @object
.size a, 2
a:
.short 42
.global b
.section .either.bss,"aw",@nobits
.balign 2
.type b, @object
.size b, 2
b:
.zero 2
.text
.balign 2
.global main
.type main, @function
main:
.L2:
BR #.L2
.size main, .-main

7
gas/testsuite/gas/msp430/low-data-bss-sym.d Normal file
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@ -0,0 +1,7 @@
#objdump: -t
#name: Check symbols to initialise data and bss have been defined for .lower sections
#...
.*__crt0_movedata.*
#...
.*__crt0_init_bss.*
#pass

24
gas/testsuite/gas/msp430/low-data-bss-sym.s Normal file
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@ -0,0 +1,24 @@
.file "main.c"
.text
.global a
.section .lower.data,"aw"
.balign 2
.type a, @object
.size a, 2
a:
.short 42
.global b
.section .lower.bss,"aw",@nobits
.balign 2
.type b, @object
.size b, 2
b:
.zero 2
.text
.balign 2
.global main
.type main, @function
main:
.L2:
BR #.L2
.size main, .-main

9
gas/testsuite/gas/msp430/msp430.exp
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@ -24,8 +24,10 @@ if [expr [istarget "msp430-*-*"]] then {
run_dump_test "bad"
run_dump_test "errata_warns"
run_dump_test "errata_fixes"
run_dump_test "high-data-bss-sym" { { as "-mdata-region=upper" } }
run_dump_test "high-data-bss-sym" { { as "-mdata-region=either" } }
run_dump_test "low-data-bss-sym"
run_dump_test "either-data-bss-sym"
run_dump_test "high-data-bss-sym" { { as "-ml -mdata-region=upper" } }
run_dump_test "high-data-bss-sym" { { as "-ml -mdata-region=either" } }
run_dump_test "pr22133"
run_dump_test "nop-int-430"
run_dump_test "nop-int-430x"
@ -38,4 +40,7 @@ if [expr [istarget "msp430-*-*"]] then {
run_dump_test "nop-dint-430x"
run_dump_test "nop-dint-430x-silent"
run_dump_test "nop-dint-430x-ignore"
run_dump_test "nop-unknown-intr-430"
run_dump_test "nop-unknown-intr-430x"
run_dump_test "nop-unknown-intr-430x-ignore"
}

14
gas/testsuite/gas/msp430/nop-unknown-intr-430.d Normal file
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@ -0,0 +1,14 @@
#name: Unknown Interrupt State NOP Insertions (MSP430 CPU)
#source: nop-unknown-intr.s
#as: -my -mu -mcpu=430
#warning_output: nop-unknown-intr-430.l
#objdump: -d --prefix-addresses --show-raw-insn
.*: +file format .*msp.*
Disassembly of section .text:
0x0+0000 12 42 00 00[ ]+mov[ ]+&0x0000,r2[ ]+;0x0000
0x0+0004 1a 42 00 00[ ]+mov[ ]+&0x0000,r10[ ]+;0x0000
0x0+0008 02 47[ ]+mov[ ]+r7,[ ]+r2[ ]+;
0x0+000a 1a 42 00 00[ ]+mov[ ]+&0x0000,r10[ ]+;0x0000

3
gas/testsuite/gas/msp430/nop-unknown-intr-430.l Normal file
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@ -0,0 +1,3 @@
[^:]*: Assembler messages:
[^:]*:11: Warning: a NOP might also be needed here, after the instruction that changed interrupt state
[^:]*:16: Warning: a NOP might also be needed here, after the instruction that changed interrupt state

13
gas/testsuite/gas/msp430/nop-unknown-intr-430x-ignore.d Normal file
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@ -0,0 +1,13 @@
#name: Ignore Unknown Interrupt State NOP Insertions (MSP430X CPU)
#source: nop-unknown-intr.s
#as: -my -mU -mcpu=430x
#objdump: -d --prefix-addresses --show-raw-insn
.*: +file format .*msp.*
Disassembly of section .text:
0x0+0000 12 42 00 00[ ]+mov[ ]+&0x0000,r2[ ]+;0x0000
0x0+0004 1a 42 00 00[ ]+mov[ ]+&0x0000,r10[ ]+;0x0000
0x0+0008 02 47[ ]+mov[ ]+r7,[ ]+r2[ ]+;
0x0+000a 1a 42 00 00[ ]+mov[ ]+&0x0000,r10[ ]+;0x0000

14
gas/testsuite/gas/msp430/nop-unknown-intr-430x.d Normal file
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@ -0,0 +1,14 @@
#name: Unknown Interrupt State NOP Insertions (MSP430X CPU)
#source: nop-unknown-intr.s
#as: -my -mu -mcpu=430x
#warning_output: nop-unknown-intr-430x.l
#objdump: -d --prefix-addresses --show-raw-insn
.*: +file format .*msp.*
Disassembly of section .text:
0x0+0000 12 42 00 00[ ]+mov[ ]+&0x0000,r2[ ]+;0x0000
0x0+0004 1a 42 00 00[ ]+mov[ ]+&0x0000,r10[ ]+;0x0000
0x0+0008 02 47[ ]+mov[ ]+r7,[ ]+r2[ ]+;
0x0+000a 1a 42 00 00[ ]+mov[ ]+&0x0000,r10[ ]+;0x0000

5
gas/testsuite/gas/msp430/nop-unknown-intr-430x.l Normal file
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@ -0,0 +1,5 @@
[^:]*: Assembler messages:
[^:]*:9: Warning: a NOP might be needed here, before this interrupt state change
[^:]*:11: Warning: a NOP might also be needed here, after the instruction that changed interrupt state
[^:]*:14: Warning: a NOP might be needed here, before this interrupt state change
[^:]*:16: Warning: a NOP might also be needed here, after the instruction that changed interrupt state

16
gas/testsuite/gas/msp430/nop-unknown-intr.s Normal file
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@ -0,0 +1,16 @@
.text
;;; Test for warnings when an instruction might change interrupt state, but
;;; the assembler doesn't know whether interrupts will be enabled or disabled.
;;; "MOV &FOO,R10" is used as an artbitrary statement which isn't a NOP, to
;;; break up the instructions being tested.
;;; Moving a value in memory into SR might change interrupt state
MOV &FOO,R2
MOV &FOO,R10
;;; Moving a value from a register into SR might change interrupt state
MOV R7,R2
MOV &FOO,R10