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c175b21ce4
Bring in the fixes for GCC 7 through 13. https://rtx.meta.security/mitigation/2023/09/12/CVE-2023-4039.html https://developer.arm.com/Arm%20Security%20Center/GCC%20Stack%20Protector%20Vulnerability%20AArch64 Signed-off-by: Chris Packham <judge.packham@gmail.com>
56 lines
2.0 KiB
Diff
56 lines
2.0 KiB
Diff
From b47766614df3b9df878262efb2ad73aaac108363 Mon Sep 17 00:00:00 2001
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From: Richard Sandiford <richard.sandiford@arm.com>
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Date: Tue, 12 Sep 2023 16:08:53 +0100
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Subject: [PATCH 21/28] aarch64: Simplify top of frame allocation
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After previous patches, it no longer really makes sense to allocate
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the top of the frame in terms of varargs_and_saved_regs_size and
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saved_regs_and_above.
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gcc/
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* config/aarch64/aarch64.cc (aarch64_layout_frame): Simplify
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the allocation of the top of the frame.
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---
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gcc/config/aarch64/aarch64.cc | 23 ++++++++---------------
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1 file changed, 8 insertions(+), 15 deletions(-)
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diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc
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index 97dd077844b4..81935852d5b2 100644
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--- a/gcc/config/aarch64/aarch64.cc
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+++ b/gcc/config/aarch64/aarch64.cc
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@@ -8325,23 +8325,16 @@ aarch64_layout_frame (void)
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frame.saved_regs_size = offset - frame.bytes_below_saved_regs;
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- poly_int64 varargs_and_saved_regs_size
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- = frame.saved_regs_size + frame.saved_varargs_size;
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+ offset += get_frame_size ();
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+ offset = aligned_upper_bound (offset, STACK_BOUNDARY / BITS_PER_UNIT);
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+ auto top_of_locals = offset;
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- poly_int64 saved_regs_and_above
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- = aligned_upper_bound (varargs_and_saved_regs_size
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- + get_frame_size (),
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- STACK_BOUNDARY / BITS_PER_UNIT);
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+ offset += frame.saved_varargs_size;
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+ gcc_assert (multiple_p (offset, STACK_BOUNDARY / BITS_PER_UNIT));
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+ frame.frame_size = offset;
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- frame.bytes_above_hard_fp
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- = saved_regs_and_above - frame.below_hard_fp_saved_regs_size;
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-
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- /* Both these values are already aligned. */
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- gcc_assert (multiple_p (frame.bytes_below_saved_regs,
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- STACK_BOUNDARY / BITS_PER_UNIT));
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- frame.frame_size = saved_regs_and_above + frame.bytes_below_saved_regs;
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-
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- frame.bytes_above_locals = frame.saved_varargs_size;
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+ frame.bytes_above_hard_fp = frame.frame_size - frame.bytes_below_hard_fp;
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+ frame.bytes_above_locals = frame.frame_size - top_of_locals;
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frame.initial_adjust = 0;
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frame.final_adjust = 0;
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--
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2.42.0
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