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80 lines
2.9 KiB
80 lines
2.9 KiB
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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