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* [gcc(refs/vendors/ARM/heads/CVE-2023-4039/gcc-10)] aarch64: Use local frame vars in shrink-wrapping code
@ 2023-09-12 15:24 Richard Sandiford
0 siblings, 0 replies; only message in thread
From: Richard Sandiford @ 2023-09-12 15:24 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:153060b97c667bbd06caad9c3fc1f9f6fe7266df
commit 153060b97c667bbd06caad9c3fc1f9f6fe7266df
Author: Richard Sandiford <richard.sandiford@arm.com>
Date: Fri Jun 16 16:43:41 2023 +0100
aarch64: Use local frame vars in shrink-wrapping code
aarch64_layout_frame uses a shorthand for referring to
cfun->machine->frame:
aarch64_frame &frame = cfun->machine->frame;
This patch does the same for some other heavy users of the structure.
No functional change intended.
gcc/
* config/aarch64/aarch64.c (aarch64_save_callee_saves): Use
a local shorthand for cfun->machine->frame.
(aarch64_restore_callee_saves, aarch64_get_separate_components):
(aarch64_process_components): Likewise.
(aarch64_allocate_and_probe_stack_space): Likewise.
(aarch64_expand_prologue, aarch64_expand_epilogue): Likewise.
(aarch64_layout_frame): Use existing shorthand for one more case.
Diff:
---
gcc/config/aarch64/aarch64.c | 115 ++++++++++++++++++++++---------------------
1 file changed, 60 insertions(+), 55 deletions(-)
diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index e6bf5ae38085..368bb394105e 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -7403,6 +7403,7 @@ aarch64_save_callee_saves (poly_int64 start_offset,
unsigned start, unsigned limit, bool skip_wb,
bool hard_fp_valid_p)
{
+ aarch64_frame &frame = cfun->machine->frame;
rtx_insn *insn;
unsigned regno;
unsigned regno2;
@@ -7417,8 +7418,8 @@ aarch64_save_callee_saves (poly_int64 start_offset,
bool frame_related_p = aarch64_emit_cfi_for_reg_p (regno);
if (skip_wb
- && (regno == cfun->machine->frame.wb_candidate1
- || regno == cfun->machine->frame.wb_candidate2))
+ && (regno == frame.wb_candidate1
+ || regno == frame.wb_candidate2))
continue;
if (cfun->machine->reg_is_wrapped_separately[regno])
@@ -7426,7 +7427,7 @@ aarch64_save_callee_saves (poly_int64 start_offset,
machine_mode mode = aarch64_reg_save_mode (regno);
reg = gen_rtx_REG (mode, regno);
- offset = start_offset + cfun->machine->frame.reg_offset[regno];
+ offset = start_offset + frame.reg_offset[regno];
rtx base_rtx = stack_pointer_rtx;
poly_int64 sp_offset = offset;
@@ -7439,7 +7440,7 @@ aarch64_save_callee_saves (poly_int64 start_offset,
{
gcc_assert (known_eq (start_offset, 0));
poly_int64 fp_offset
- = cfun->machine->frame.below_hard_fp_saved_regs_size;
+ = frame.below_hard_fp_saved_regs_size;
if (hard_fp_valid_p)
base_rtx = hard_frame_pointer_rtx;
else
@@ -7461,8 +7462,7 @@ aarch64_save_callee_saves (poly_int64 start_offset,
&& (regno2 = aarch64_next_callee_save (regno + 1, limit)) <= limit
&& !cfun->machine->reg_is_wrapped_separately[regno2]
&& known_eq (GET_MODE_SIZE (mode),
- cfun->machine->frame.reg_offset[regno2]
- - cfun->machine->frame.reg_offset[regno]))
+ frame.reg_offset[regno2] - frame.reg_offset[regno]))
{
rtx reg2 = gen_rtx_REG (mode, regno2);
rtx mem2;
@@ -7512,6 +7512,7 @@ static void
aarch64_restore_callee_saves (poly_int64 start_offset, unsigned start,
unsigned limit, bool skip_wb, rtx *cfi_ops)
{
+ aarch64_frame &frame = cfun->machine->frame;
unsigned regno;
unsigned regno2;
poly_int64 offset;
@@ -7528,13 +7529,13 @@ aarch64_restore_callee_saves (poly_int64 start_offset, unsigned start,
rtx reg, mem;
if (skip_wb
- && (regno == cfun->machine->frame.wb_candidate1
- || regno == cfun->machine->frame.wb_candidate2))
+ && (regno == frame.wb_candidate1
+ || regno == frame.wb_candidate2))
continue;
machine_mode mode = aarch64_reg_save_mode (regno);
reg = gen_rtx_REG (mode, regno);
- offset = start_offset + cfun->machine->frame.reg_offset[regno];
+ offset = start_offset + frame.reg_offset[regno];
rtx base_rtx = stack_pointer_rtx;
if (mode == VNx2DImode && BYTES_BIG_ENDIAN)
aarch64_adjust_sve_callee_save_base (mode, base_rtx, anchor_reg,
@@ -7545,8 +7546,7 @@ aarch64_restore_callee_saves (poly_int64 start_offset, unsigned start,
&& (regno2 = aarch64_next_callee_save (regno + 1, limit)) <= limit
&& !cfun->machine->reg_is_wrapped_separately[regno2]
&& known_eq (GET_MODE_SIZE (mode),
- cfun->machine->frame.reg_offset[regno2]
- - cfun->machine->frame.reg_offset[regno]))
+ frame.reg_offset[regno2] - frame.reg_offset[regno]))
{
rtx reg2 = gen_rtx_REG (mode, regno2);
rtx mem2;
@@ -7640,6 +7640,7 @@ offset_12bit_unsigned_scaled_p (machine_mode mode, poly_int64 offset)
static sbitmap
aarch64_get_separate_components (void)
{
+ aarch64_frame &frame = cfun->machine->frame;
sbitmap components = sbitmap_alloc (LAST_SAVED_REGNUM + 1);
bitmap_clear (components);
@@ -7656,18 +7657,18 @@ aarch64_get_separate_components (void)
if (mode == VNx2DImode && BYTES_BIG_ENDIAN)
continue;
- poly_int64 offset = cfun->machine->frame.reg_offset[regno];
+ poly_int64 offset = frame.reg_offset[regno];
/* If the register is saved in the first SVE save slot, we use
it as a stack probe for -fstack-clash-protection. */
if (flag_stack_clash_protection
- && maybe_ne (cfun->machine->frame.below_hard_fp_saved_regs_size, 0)
+ && maybe_ne (frame.below_hard_fp_saved_regs_size, 0)
&& known_eq (offset, 0))
continue;
/* Get the offset relative to the register we'll use. */
if (frame_pointer_needed)
- offset -= cfun->machine->frame.below_hard_fp_saved_regs_size;
+ offset -= frame.below_hard_fp_saved_regs_size;
else
offset += crtl->outgoing_args_size;
@@ -7686,11 +7687,11 @@ aarch64_get_separate_components (void)
/* If the spare predicate register used by big-endian SVE code
is call-preserved, it must be saved in the main prologue
before any saves that use it. */
- if (cfun->machine->frame.spare_pred_reg != INVALID_REGNUM)
- bitmap_clear_bit (components, cfun->machine->frame.spare_pred_reg);
+ if (frame.spare_pred_reg != INVALID_REGNUM)
+ bitmap_clear_bit (components, frame.spare_pred_reg);
- unsigned reg1 = cfun->machine->frame.wb_candidate1;
- unsigned reg2 = cfun->machine->frame.wb_candidate2;
+ unsigned reg1 = frame.wb_candidate1;
+ unsigned reg2 = frame.wb_candidate2;
/* If registers have been chosen to be stored/restored with
writeback don't interfere with them to avoid having to output explicit
stack adjustment instructions. */
@@ -7799,6 +7800,7 @@ aarch64_get_next_set_bit (sbitmap bmp, unsigned int start)
static void
aarch64_process_components (sbitmap components, bool prologue_p)
{
+ aarch64_frame &frame = cfun->machine->frame;
rtx ptr_reg = gen_rtx_REG (Pmode, frame_pointer_needed
? HARD_FRAME_POINTER_REGNUM
: STACK_POINTER_REGNUM);
@@ -7813,9 +7815,9 @@ aarch64_process_components (sbitmap components, bool prologue_p)
machine_mode mode = aarch64_reg_save_mode (regno);
rtx reg = gen_rtx_REG (mode, regno);
- poly_int64 offset = cfun->machine->frame.reg_offset[regno];
+ poly_int64 offset = frame.reg_offset[regno];
if (frame_pointer_needed)
- offset -= cfun->machine->frame.below_hard_fp_saved_regs_size;
+ offset -= frame.below_hard_fp_saved_regs_size;
else
offset += crtl->outgoing_args_size;
@@ -7840,14 +7842,14 @@ aarch64_process_components (sbitmap components, bool prologue_p)
break;
}
- poly_int64 offset2 = cfun->machine->frame.reg_offset[regno2];
+ poly_int64 offset2 = frame.reg_offset[regno2];
/* The next register is not of the same class or its offset is not
mergeable with the current one into a pair. */
if (aarch64_sve_mode_p (mode)
|| !satisfies_constraint_Ump (mem)
|| GP_REGNUM_P (regno) != GP_REGNUM_P (regno2)
|| (crtl->abi->id () == ARM_PCS_SIMD && FP_REGNUM_P (regno))
- || maybe_ne ((offset2 - cfun->machine->frame.reg_offset[regno]),
+ || maybe_ne ((offset2 - frame.reg_offset[regno]),
GET_MODE_SIZE (mode)))
{
insn = emit_insn (set);
@@ -7869,7 +7871,7 @@ aarch64_process_components (sbitmap components, bool prologue_p)
/* REGNO2 can be saved/restored in a pair with REGNO. */
rtx reg2 = gen_rtx_REG (mode, regno2);
if (frame_pointer_needed)
- offset2 -= cfun->machine->frame.below_hard_fp_saved_regs_size;
+ offset2 -= frame.below_hard_fp_saved_regs_size;
else
offset2 += crtl->outgoing_args_size;
rtx addr2 = plus_constant (Pmode, ptr_reg, offset2);
@@ -7964,6 +7966,7 @@ aarch64_allocate_and_probe_stack_space (rtx temp1, rtx temp2,
bool frame_related_p,
bool final_adjustment_p)
{
+ aarch64_frame &frame = cfun->machine->frame;
HOST_WIDE_INT guard_size
= 1 << param_stack_clash_protection_guard_size;
HOST_WIDE_INT guard_used_by_caller = STACK_CLASH_CALLER_GUARD;
@@ -7984,25 +7987,25 @@ aarch64_allocate_and_probe_stack_space (rtx temp1, rtx temp2,
register as a probe. We can't assume that LR was saved at position 0
though, so treat any space below it as unprobed. */
if (final_adjustment_p
- && known_eq (cfun->machine->frame.below_hard_fp_saved_regs_size, 0))
+ && known_eq (frame.below_hard_fp_saved_regs_size, 0))
{
- poly_int64 lr_offset = cfun->machine->frame.reg_offset[LR_REGNUM];
+ poly_int64 lr_offset = frame.reg_offset[LR_REGNUM];
if (known_ge (lr_offset, 0))
min_probe_threshold -= lr_offset.to_constant ();
else
gcc_assert (!flag_stack_clash_protection || known_eq (poly_size, 0));
}
- poly_int64 frame_size = cfun->machine->frame.frame_size;
+ poly_int64 frame_size = frame.frame_size;
/* We should always have a positive probe threshold. */
gcc_assert (min_probe_threshold > 0);
if (flag_stack_clash_protection && !final_adjustment_p)
{
- poly_int64 initial_adjust = cfun->machine->frame.initial_adjust;
- poly_int64 sve_callee_adjust = cfun->machine->frame.sve_callee_adjust;
- poly_int64 final_adjust = cfun->machine->frame.final_adjust;
+ poly_int64 initial_adjust = frame.initial_adjust;
+ poly_int64 sve_callee_adjust = frame.sve_callee_adjust;
+ poly_int64 final_adjust = frame.final_adjust;
if (known_eq (frame_size, 0))
{
@@ -8291,17 +8294,18 @@ aarch64_epilogue_uses (int regno)
void
aarch64_expand_prologue (void)
{
- poly_int64 frame_size = cfun->machine->frame.frame_size;
- poly_int64 initial_adjust = cfun->machine->frame.initial_adjust;
- HOST_WIDE_INT callee_adjust = cfun->machine->frame.callee_adjust;
- poly_int64 final_adjust = cfun->machine->frame.final_adjust;
- poly_int64 callee_offset = cfun->machine->frame.callee_offset;
- poly_int64 sve_callee_adjust = cfun->machine->frame.sve_callee_adjust;
+ aarch64_frame &frame = cfun->machine->frame;
+ poly_int64 frame_size = frame.frame_size;
+ poly_int64 initial_adjust = frame.initial_adjust;
+ HOST_WIDE_INT callee_adjust = frame.callee_adjust;
+ poly_int64 final_adjust = frame.final_adjust;
+ poly_int64 callee_offset = frame.callee_offset;
+ poly_int64 sve_callee_adjust = frame.sve_callee_adjust;
poly_int64 below_hard_fp_saved_regs_size
- = cfun->machine->frame.below_hard_fp_saved_regs_size;
- unsigned reg1 = cfun->machine->frame.wb_candidate1;
- unsigned reg2 = cfun->machine->frame.wb_candidate2;
- bool emit_frame_chain = cfun->machine->frame.emit_frame_chain;
+ = frame.below_hard_fp_saved_regs_size;
+ unsigned reg1 = frame.wb_candidate1;
+ unsigned reg2 = frame.wb_candidate2;
+ bool emit_frame_chain = frame.emit_frame_chain;
rtx_insn *insn;
if (flag_stack_clash_protection && known_eq (callee_adjust, 0))
@@ -8367,7 +8371,7 @@ aarch64_expand_prologue (void)
/* The offset of the frame chain record (if any) from the current SP. */
poly_int64 chain_offset = (initial_adjust + callee_adjust
- - cfun->machine->frame.hard_fp_offset);
+ - frame.hard_fp_offset);
gcc_assert (known_ge (chain_offset, 0));
/* The offset of the bottom of the save area from the current SP. */
@@ -8470,15 +8474,16 @@ aarch64_use_return_insn_p (void)
void
aarch64_expand_epilogue (bool for_sibcall)
{
- poly_int64 initial_adjust = cfun->machine->frame.initial_adjust;
- HOST_WIDE_INT callee_adjust = cfun->machine->frame.callee_adjust;
- poly_int64 final_adjust = cfun->machine->frame.final_adjust;
- poly_int64 callee_offset = cfun->machine->frame.callee_offset;
- poly_int64 sve_callee_adjust = cfun->machine->frame.sve_callee_adjust;
+ aarch64_frame &frame = cfun->machine->frame;
+ poly_int64 initial_adjust = frame.initial_adjust;
+ HOST_WIDE_INT callee_adjust = frame.callee_adjust;
+ poly_int64 final_adjust = frame.final_adjust;
+ poly_int64 callee_offset = frame.callee_offset;
+ poly_int64 sve_callee_adjust = frame.sve_callee_adjust;
poly_int64 below_hard_fp_saved_regs_size
- = cfun->machine->frame.below_hard_fp_saved_regs_size;
- unsigned reg1 = cfun->machine->frame.wb_candidate1;
- unsigned reg2 = cfun->machine->frame.wb_candidate2;
+ = frame.below_hard_fp_saved_regs_size;
+ unsigned reg1 = frame.wb_candidate1;
+ unsigned reg2 = frame.wb_candidate2;
rtx cfi_ops = NULL;
rtx_insn *insn;
/* A stack clash protection prologue may not have left EP0_REGNUM or
@@ -8511,7 +8516,7 @@ aarch64_expand_epilogue (bool for_sibcall)
/* We need to add memory barrier to prevent read from deallocated stack. */
bool need_barrier_p
= maybe_ne (get_frame_size ()
- + cfun->machine->frame.saved_varargs_size, 0);
+ + frame.saved_varargs_size, 0);
/* Emit a barrier to prevent loads from a deallocated stack. */
if (maybe_gt (final_adjust, crtl->outgoing_args_size)
@@ -11170,24 +11175,24 @@ aarch64_can_eliminate (const int from ATTRIBUTE_UNUSED, const int to)
poly_int64
aarch64_initial_elimination_offset (unsigned from, unsigned to)
{
+ aarch64_frame &frame = cfun->machine->frame;
+
if (to == HARD_FRAME_POINTER_REGNUM)
{
if (from == ARG_POINTER_REGNUM)
- return cfun->machine->frame.hard_fp_offset;
+ return frame.hard_fp_offset;
if (from == FRAME_POINTER_REGNUM)
- return cfun->machine->frame.hard_fp_offset
- - cfun->machine->frame.locals_offset;
+ return frame.hard_fp_offset - frame.locals_offset;
}
if (to == STACK_POINTER_REGNUM)
{
if (from == FRAME_POINTER_REGNUM)
- return cfun->machine->frame.frame_size
- - cfun->machine->frame.locals_offset;
+ return frame.frame_size - frame.locals_offset;
}
- return cfun->machine->frame.frame_size;
+ return frame.frame_size;
}
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