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commit 5fdcac79eb72406c59fa72073dfb3ba21380f56d
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Author: ktkachov <ktkachov@138bc75d-0d04-0410-961f-82ee72b054a4>
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Date: Tue Apr 10 09:58:57 2018 +0000
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[explow] PR target/85173: validize memory before passing it on to target probe_stack
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In this PR the expansion code emits an invalid memory address for the stack probe, which the backend fails to recognise.
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The address is created explicitly in anti_adjust_stack_and_probe_stack_clash in explow.c and passed down to gen_probe_stack
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without any validation in emit_stack_probe.
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This patch fixes the ICE by calling validize_mem on the memory location before passing it down to the target.
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Jakub pointed out that we also want to create valid addresses for the probe_stack_address case, so this patch
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creates an expand operand and legitimizes it before passing it down to the probe_stack_address expander.
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This patch passes bootstrap and testing on arm-none-linux-gnueabihf and aarch64-none-linux-gnu
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and ppc64le-redhat-linux on gcc112 in the compile farm.
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PR target/85173
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* explow.c (emit_stack_probe): Call validize_mem on memory location
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before passing it to gen_probe_stack. Create address operand and
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legitimize it for the probe_stack_address case.
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* gcc.target/arm/pr85173.c: New test.
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git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@259266 138bc75d-0d04-0410-961f-82ee72b054a4
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diff --git a/gcc/explow.c b/gcc/explow.c
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index 9386489..e2253ae 100644
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--- a/gcc/explow.c
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+++ b/gcc/explow.c
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@@ -1549,13 +1549,20 @@ emit_stack_probe (rtx address)
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{
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#ifdef HAVE_probe_stack_address
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if (HAVE_probe_stack_address)
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- emit_insn (gen_probe_stack_address (address));
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+ {
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+ struct expand_operand ops[1];
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+ insn_code icode = targetm.code_for_probe_stack_address;
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+ create_address_operand (ops, address);
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+ maybe_legitimize_operands (icode, 0, 1, ops);
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+ expand_insn (icode, 1, ops);
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+ }
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else
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#endif
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{
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rtx memref = gen_rtx_MEM (word_mode, address);
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MEM_VOLATILE_P (memref) = 1;
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+ memref = validize_mem (memref);
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/* See if we have an insn to probe the stack. */
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#ifdef HAVE_probe_stack
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diff --git a/gcc/testsuite/gcc.target/arm/pr85173.c b/gcc/testsuite/gcc.target/arm/pr85173.c
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new file mode 100644
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index 0000000..36105c9
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--- /dev/null
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+++ b/gcc/testsuite/gcc.target/arm/pr85173.c
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@@ -0,0 +1,20 @@
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+/* PR target/85173. */
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+
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+/* { dg-do compile } */
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+/* { dg-options "-O2 -fstack-clash-protection --param stack-clash-protection-probe-interval=14" } */
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+/* { dg-require-effective-target arm_thumb2_ok } */
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+
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+__attribute__((noinline, noclone)) void
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+foo (char *p)
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+{
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+ asm volatile ("" : : "r" (p) : "memory");
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+}
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+
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+/* Nonconstant alloca, small local frame. */
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+__attribute__((noinline, noclone)) void
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+f5 (int x)
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+{
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+ char locals[128];
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+ char *vla = __builtin_alloca (x);
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+ foo (vla);
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+}
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