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msp430.c (is_wakeup_func): New function.

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* config/msp430/msp430.c (is_wakeup_func): New function.  Returns
	true if the current function has the wakeup attribute.
	(msp430_start_function): Note if the function has the wakeup
	attribute.
	(msp430_attribute_table): Add wakeup attribute.
	(msp430_expand_epilogue): Add support for wakeup functions.
	* config/msp430/msp430.md (disable_interrupts): Emit a NOP after
	the DINT instruction.
	* doc/extend.texi: Document the wakeup attribute.

From-SVN: r205958
This commit is contained in:
Nick Clifton 2013-12-13 10:00:40 +00:00 committed by Nick Clifton
parent e8111c8c64
commit a005b5befd
4 changed files with 42 additions and 6 deletions
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12
gcc/ChangeLog
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@ -1,3 +1,15 @@
2013-12-13 Nick Clifton <nickc@redhat.com>
* config/msp430/msp430.c (is_wakeup_func): New function. Returns
true if the current function has the wakeup attribute.
(msp430_start_function): Note if the function has the wakeup
attribute.
(msp430_attribute_table): Add wakeup attribute.
(msp430_expand_epilogue): Add support for wakeup functions.
* config/msp430/msp430.md (disable_interrupts): Emit a NOP after
the DINT instruction.
* doc/extend.texi: Document the wakeup attribute.
2013-12-13 Kai Tietz <kitetz@redhat.com>
PR c++/57897

25
gcc/config/msp430/msp430.c
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@ -188,7 +188,7 @@ msp430_mcu_name (void)
mcu_name[i] = TOUPPER (mcu_name[i]);
return mcu_name;
}
return msp430x ? "__MSP430XGENERIC__" : "__MSP430GENERIC__";
}
@ -966,6 +966,12 @@ msp430_is_interrupt_func (void)
return is_attr_func ("interrupt");
}
static bool
is_wakeup_func (void)
{
return msp430_is_interrupt_func () && is_attr_func ("wakeup");
}
static inline bool
is_naked_func (void)
{
@ -1005,6 +1011,8 @@ msp430_start_function (FILE *outfile, HOST_WIDE_INT hwi_local ATTRIBUTE_UNUSED)
fprintf (outfile, "reentrant ");
if (is_critical_func ())
fprintf (outfile, "critical ");
if (is_wakeup_func ())
fprintf (outfile, "wakeup ");
fprintf (outfile, "\n");
}
@ -1131,6 +1139,7 @@ const struct attribute_spec msp430_attribute_table[] =
{ "naked", 0, 0, true, false, false, msp430_attr, false },
{ "reentrant", 0, 0, true, false, false, msp430_attr, false },
{ "critical", 0, 0, true, false, false, msp430_attr, false },
{ "wakeup", 0, 0, true, false, false, msp430_attr, false },
{ NULL, 0, 0, false, false, false, NULL, false }
};
@ -1409,6 +1418,14 @@ msp430_expand_epilogue (int is_eh)
emit_insn (gen_epilogue_start_marker ());
if (is_wakeup_func ())
/* Clear the SCG1, SCG0, OSCOFF and CPUOFF bits in the saved copy of the
status register current residing on the stack. When this function
executes its RETI instruction the SR will be updated with this saved
value, thus ensuring that the processor is woken up from any low power
state in which it may be residing. */
emit_insn (gen_bic_SR (GEN_INT (0xf0)));
fs = cfun->machine->framesize_locals + cfun->machine->framesize_outgoing;
increment_stack (fs);
@ -1828,7 +1845,7 @@ msp430_output_labelref (FILE *file, const char *name)
static void
msp430_print_operand_raw (FILE * file, rtx op)
{
int i;
HOST_WIDE_INT i;
switch (GET_CODE (op))
{
@ -1839,9 +1856,9 @@ msp430_print_operand_raw (FILE * file, rtx op)
case CONST_INT:
i = INTVAL (op);
if (TARGET_ASM_HEX)
fprintf (file, "%#x", i);
fprintf (file, "%#" HOST_WIDE_INT_PRINT "x", i);
else
fprintf (file, "%d", i);
fprintf (file, "%" HOST_WIDE_INT_PRINT "d", i);
break;
case CONST:

4
gcc/config/msp430/msp430.md
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@ -1253,11 +1253,11 @@
"1"
"NOP"
)
(define_insn "disable_interrupts"
[(unspec_volatile [(const_int 0)] UNS_DINT)]
""
"DINT"
"DINT \; NOP"
)
(define_insn "enable_interrupts"

7
gcc/doc/extend.texi
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@ -2919,6 +2919,13 @@ upon exit. Reentrant functions cannot also have the @code{naked}
or @code{critical} attributes. They can have the @code{interrupt}
attribute.
@item wakeup
@cindex @code{wakeup} attribute
This attribute only applies to interrupt functions. It is silently
ignored if applied to a non-interrupt function. A wakeup interrupt
function will rouse the processor from any low-power state that it
might be in when the function exits.
@end table
On Epiphany targets one or more optional parameters can be added like this: