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xtensa: add support for SSP

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gcc/
2017-12-05  Max Filippov  <jcmvbkbc@gmail.com>

	Backport from mainline
	2017-05-08  Max Filippov  <jcmvbkbc@gmail.com>
	* config/xtensa/xtensa-protos.h
       	(xtensa_initial_elimination_offset): New declaration.
	* config/xtensa/xtensa.c (xtensa_initial_elimination_offset):
	New function. Move its body from the INITIAL_ELIMINATION_OFFSET
	macro definition, add case for FRAME_POINTER_REGNUM when
	FRAME_GROWS_DOWNWARD.
	* config/xtensa/xtensa.h (FRAME_GROWS_DOWNWARD): New macro
	definition.
	(INITIAL_ELIMINATION_OFFSET): Replace body with call to
	xtensa_initial_elimination_offset.

From-SVN: r255421
This commit is contained in:
Max Filippov 2017-12-05 14:29:53 +00:00 committed by Max Filippov
parent 1247cb582c
commit 6c118c0f70
4 changed files with 44 additions and 15 deletions
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15
gcc/ChangeLog
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@ -1,3 +1,18 @@
2017-12-05 Max Filippov <jcmvbkbc@gmail.com>
Backport from mainline
2017-05-08 Max Filippov <jcmvbkbc@gmail.com>
* config/xtensa/xtensa-protos.h
(xtensa_initial_elimination_offset): New declaration.
* config/xtensa/xtensa.c (xtensa_initial_elimination_offset):
New function. Move its body from the INITIAL_ELIMINATION_OFFSET
macro definition, add case for FRAME_POINTER_REGNUM when
FRAME_GROWS_DOWNWARD.
* config/xtensa/xtensa.h (FRAME_GROWS_DOWNWARD): New macro
definition.
(INITIAL_ELIMINATION_OFFSET): Replace body with call to
xtensa_initial_elimination_offset.
2017-12-04 Eric Botcazou <ebotcazou@adacore.com>
* config/sparc/sparc.c (sparc_do_work_around_errata): Use mem_ref

1
gcc/config/xtensa/xtensa-protos.h
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@ -73,5 +73,6 @@ extern void xtensa_expand_prologue (void);
extern void xtensa_expand_epilogue (void);
extern void order_regs_for_local_alloc (void);
extern enum reg_class xtensa_regno_to_class (int regno);
extern HOST_WIDE_INT xtensa_initial_elimination_offset (int from, int to);
#endif /* !__XTENSA_PROTOS_H__ */

24
gcc/config/xtensa/xtensa.c
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@ -2678,6 +2678,30 @@ xtensa_frame_pointer_required (void)
return false;
}
HOST_WIDE_INT
xtensa_initial_elimination_offset (int from, int to)
{
long frame_size = compute_frame_size (get_frame_size ());
HOST_WIDE_INT offset;
switch (from)
{
case FRAME_POINTER_REGNUM:
if (FRAME_GROWS_DOWNWARD)
offset = frame_size - (WINDOW_SIZE * UNITS_PER_WORD)
- cfun->machine->callee_save_size;
else
offset = 0;
break;
case ARG_POINTER_REGNUM:
offset = frame_size;
break;
default:
gcc_unreachable ();
}
return offset;
}
/* minimum frame = reg save area (4 words) plus static chain (1 word)
and the total number of words must be a multiple of 128 bits. */

19
gcc/config/xtensa/xtensa.h
View File

@ -460,9 +460,11 @@ enum reg_class
#define STACK_GROWS_DOWNWARD 1
#define FRAME_GROWS_DOWNWARD flag_stack_protect
/* Offset within stack frame to start allocating local variables at. */
#define STARTING_FRAME_OFFSET \
crtl->outgoing_args_size
(FRAME_GROWS_DOWNWARD ? 0 : crtl->outgoing_args_size)
/* The ARG_POINTER and FRAME_POINTER are not real Xtensa registers, so
they are eliminated to either the stack pointer or hard frame pointer. */
@ -474,20 +476,7 @@ enum reg_class
/* Specify the initial difference between the specified pair of registers. */
#define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
do { \
long frame_size = compute_frame_size (get_frame_size ()); \
switch (FROM) \
{ \
case FRAME_POINTER_REGNUM: \
(OFFSET) = 0; \
break; \
case ARG_POINTER_REGNUM: \
(OFFSET) = frame_size; \
break; \
default: \
gcc_unreachable (); \
} \
} while (0)
(OFFSET) = xtensa_initial_elimination_offset ((FROM), (TO))
/* If defined, the maximum amount of space required for outgoing
arguments will be computed and placed into the variable