-fstack-clash-protection is now separate from -fstack-check=. But we
still want targets without stack-clash specific prologue support to be
able to get partial coverage from -fstack-clash-protection. This adds
the necessary checks for flag_stack_clash_protection to the appropriate
targets so we can re-use -fstack-check=specific to give some stack clsh
protection.
I did not add it to the targets where I've done stack-clash-protection
support. It'd be a waste of time (x86, ppc, aarch64, s390).
OK for the trunk?
* config/alpha/alpha.c (alpha_expand_prologue): Also check
flag_stack_clash_protection.
* config/arm/arm.c (arm_compute_static_chain_stack_bytes): Likewise.
(arm_expand_prologue, thumb1_expand_prologue): Likewise.
(arm_frame_pointer_required): Likewise.
* config/ia64/ia64.c (ia64_compute_frame_size): Likewise.
(ia64_expand_prologue): Likewise.
* config/mips/mips.c (mips_expand_prologue): Likewise.
* config/powerpcspe/powerpcspe.c (rs6000_expand_prologue): Likewise.
* config/sparc/sparc.c (sparc_expand_prologue): Likewise.
(sparc_flat_expand_prologue): Likewise.
* config/spu/spu.c (spu_expand_prologue): Likewise.
diff --git a/gcc/config/alpha/alpha.c b/gcc/config/alpha/alpha.c
index 91f3d7c..36e78a0 100644
--- a/gcc/config/alpha/alpha.c
+++ b/gcc/config/alpha/alpha.c
@@ -7740,7 +7740,7 @@ alpha_expand_prologue (void)
Note that we are only allowed to adjust sp once in the prologue. */
probed_size = frame_size;
- if (flag_stack_check)
+ if (flag_stack_check || flag_stack_clash_protection)
probed_size += get_stack_check_protect ();
if (probed_size <= 32768)
@@ -7755,7 +7755,7 @@ alpha_expand_prologue (void)
/* We only have to do this probe if we aren't saving registers or
if we are probing beyond the frame because of -fstack-check. */
if ((sa_size == 0 && probed_size > probed - 4096)
- || flag_stack_check)
+ || flag_stack_check || flag_stack_clash_protection)
emit_insn (gen_probe_stack (GEN_INT (-probed_size)));
}
@@ -7785,7 +7785,8 @@ alpha_expand_prologue (void)
late in the compilation, generate the loop as a single insn. */
emit_insn (gen_prologue_stack_probe_loop (count, ptr));
- if ((leftover > 4096 && sa_size == 0) || flag_stack_check)
+ if ((leftover > 4096 && sa_size == 0)
+ || flag_stack_check || flag_stack_clash_protection)
{
rtx last = gen_rtx_MEM (DImode,
plus_constant (Pmode, ptr, -leftover));
@@ -7793,7 +7794,7 @@ alpha_expand_prologue (void)
emit_move_insn (last, const0_rtx);
}
- if (flag_stack_check)
+ if (flag_stack_check || flag_stack_clash_protection)
{
/* If -fstack-check is specified we have to load the entire
constant into a register and subtract from the sp in one go,
diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index 9822ca7..4a93767 100644
--- a/gcc/config/arm/arm.c
+++ b/gcc/config/arm/arm.c
@@ -19151,7 +19151,8 @@ arm_compute_static_chain_stack_bytes (void)
/* See the defining assertion in arm_expand_prologue. */
if (IS_NESTED (arm_current_func_type ())
&& ((TARGET_APCS_FRAME && frame_pointer_needed && TARGET_ARM)
- || (flag_stack_check == STATIC_BUILTIN_STACK_CHECK
+ || ((flag_stack_check == STATIC_BUILTIN_STACK_CHECK
+ || flag_stack_clash_protection)
&& !df_regs_ever_live_p (LR_REGNUM)))
&& arm_r3_live_at_start_p ()
&& crtl->args.pretend_args_size == 0)
@@ -21453,7 +21454,8 @@ arm_expand_prologue (void)
clobbered when creating the frame, we need to save and restore it. */
clobber_ip = IS_NESTED (func_type)
&& ((TARGET_APCS_FRAME && frame_pointer_needed && TARGET_ARM)
- || (flag_stack_check == STATIC_BUILTIN_STACK_CHECK
+ || ((flag_stack_check == STATIC_BUILTIN_STACK_CHECK
+ || flag_stack_clash_protection)
&& !df_regs_ever_live_p (LR_REGNUM)
&& arm_r3_live_at_start_p ()));
@@ -21667,7 +21669,8 @@ arm_expand_prologue (void)
stack checking. We use IP as the first scratch register, except for the
non-APCS nested functions if LR or r3 are available (see clobber_ip). */
if (!IS_INTERRUPT (func_type)
- && flag_stack_check == STATIC_BUILTIN_STACK_CHECK)
+ && (flag_stack_check == STATIC_BUILTIN_STACK_CHECK
+ || flag_stack_clash_protection))
{
unsigned int regno;
@@ -24959,7 +24962,9 @@ thumb1_expand_prologue (void)
current_function_static_stack_size = size;
/* If we have a frame, then do stack checking. FIXME: not implemented. */
- if (flag_stack_check == STATIC_BUILTIN_STACK_CHECK && size)
+ if ((flag_stack_check == STATIC_BUILTIN_STACK_CHECK
+ || flag_stack_clash_protection)
+ && size)
sorry ("-fstack-check=specific for Thumb-1");
amount = offsets->outgoing_args - offsets->saved_regs;
@@ -27839,7 +27844,8 @@ arm_frame_pointer_required (void)
instruction prior to the stack adjustment and this requires a frame
pointer if we want to catch the exception using the EABI unwinder. */
if (!IS_INTERRUPT (arm_current_func_type ())
- && flag_stack_check == STATIC_BUILTIN_STACK_CHECK
+ && (flag_stack_check == STATIC_BUILTIN_STACK_CHECK
+ || flag_stack_clash_protection)
&& arm_except_unwind_info (&global_options) == UI_TARGET
&& cfun->can_throw_non_call_exceptions)
{
diff --git a/gcc/config/ia64/ia64.c b/gcc/config/ia64/ia64.c
index 70aef34..26e2b02 100644
--- a/gcc/config/ia64/ia64.c
+++ b/gcc/config/ia64/ia64.c
@@ -2683,7 +2683,8 @@ ia64_compute_frame_size (HOST_WIDE_INT size)
mark_reg_gr_used_mask (cfun->machine->ia64_eh_epilogue_bsp, NULL);
/* Static stack checking uses r2 and r3. */
- if (flag_stack_check == STATIC_BUILTIN_STACK_CHECK)
+ if (flag_stack_check == STATIC_BUILTIN_STACK_CHECK
+ || flag_stack_clash_protection)
current_frame_info.gr_used_mask |= 0xc;
/* Find the size of the register stack frame. We have only 80 local
@@ -3473,7 +3474,8 @@ ia64_expand_prologue (void)
if (flag_stack_usage_info)
current_function_static_stack_size = current_frame_info.total_size;
- if (flag_stack_check == STATIC_BUILTIN_STACK_CHECK)
+ if (flag_stack_check == STATIC_BUILTIN_STACK_CHECK
+ || flag_stack_clash_protection)
{
HOST_WIDE_INT size = current_frame_info.total_size;
int bs_size = BACKING_STORE_SIZE (current_frame_info.n_input_regs
diff --git a/gcc/config/mips/mips.c b/gcc/config/mips/mips.c
index 7d85ce7..b2d3c73 100644
--- a/gcc/config/mips/mips.c
+++ b/gcc/config/mips/mips.c
@@ -12077,7 +12077,8 @@ mips_expand_prologue (void)
if (flag_stack_usage_info)
current_function_static_stack_size = size;
- if (flag_stack_check == STATIC_BUILTIN_STACK_CHECK)
+ if (flag_stack_check == STATIC_BUILTIN_STACK_CHECK
+ || flag_stack_clash_protection)
{
if (crtl->is_leaf && !cfun->calls_alloca)
{
diff --git a/gcc/config/powerpcspe/powerpcspe.c
b/gcc/config/powerpcspe/powerpcspe.c
index df5d3cd..1f2da3a 100644
--- a/gcc/config/powerpcspe/powerpcspe.c
+++ b/gcc/config/powerpcspe/powerpcspe.c
@@ -29591,7 +29591,8 @@ rs6000_emit_prologue (void)
if (flag_stack_usage_info)
current_function_static_stack_size = info->total_size;
- if (flag_stack_check == STATIC_BUILTIN_STACK_CHECK)
+ if (flag_stack_check == STATIC_BUILTIN_STACK_CHECK
+ || flag_stack_check_protection)
{
HOST_WIDE_INT size = info->total_size;
diff --git a/gcc/config/sparc/sparc.c b/gcc/config/sparc/sparc.c
index 1da032a..ed14d35 100644
--- a/gcc/config/sparc/sparc.c
+++ b/gcc/config/sparc/sparc.c
@@ -5548,7 +5548,8 @@ sparc_expand_prologue (void)
if (flag_stack_usage_info)
current_function_static_stack_size = size;
- if (flag_stack_check == STATIC_BUILTIN_STACK_CHECK)
+ if (flag_stack_check == STATIC_BUILTIN_STACK_CHECK
+ || flag_stack_check_protection)
{
if (crtl->is_leaf && !cfun->calls_alloca)
{
@@ -5659,7 +5660,8 @@ sparc_flat_expand_prologue (void)
if (flag_stack_usage_info)
current_function_static_stack_size = size;
- if (flag_stack_check == STATIC_BUILTIN_STACK_CHECK)
+ if (flag_stack_check == STATIC_BUILTIN_STACK_CHECK
+ || flag_stack_check_protection)
{
if (crtl->is_leaf && !cfun->calls_alloca)
{
diff --git a/gcc/config/spu/spu.c b/gcc/config/spu/spu.c
index fcb85c0..22745fa 100644
--- a/gcc/config/spu/spu.c
+++ b/gcc/config/spu/spu.c
@@ -1760,7 +1760,7 @@ spu_expand_prologue (void)
if (total_size > 0)
{
- if (flag_stack_check)
+ if (flag_stack_check || flag_stack_clash_protection)
{
/* We compare against total_size-1 because
($sp >= total_size) <=> ($sp > total_size-1) */
@@ -5364,7 +5364,7 @@ spu_allocate_stack (rtx op0, rtx op1)
emit_insn (gen_spu_convert (sp, stack_pointer_rtx));
emit_insn (gen_subv4si3 (sp, sp, splatted));
- if (flag_stack_check)
+ if (flag_stack_check || flag_stack_clash_protection)
{
rtx avail = gen_reg_rtx(SImode);
rtx result = gen_reg_rtx(SImode);
