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251 lines
9.3 KiB
251 lines
9.3 KiB
1 month ago
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commit 354cabcb2634abe16da7a2ba5e648aac1204b58e
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Author: H.J. Lu <hjl.tools@gmail.com>
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Date: Mon Mar 18 06:40:16 2024 -0700
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x86-64: Allocate state buffer space for RDI, RSI and RBX
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_dl_tlsdesc_dynamic preserves RDI, RSI and RBX before realigning stack.
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After realigning stack, it saves RCX, RDX, R8, R9, R10 and R11. Define
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TLSDESC_CALL_REGISTER_SAVE_AREA to allocate space for RDI, RSI and RBX
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to avoid clobbering saved RDI, RSI and RBX values on stack by xsave to
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STATE_SAVE_OFFSET(%rsp).
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+==================+<- stack frame start aligned at 8 or 16 bytes
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| |<- RDI saved in the red zone
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| |<- RSI saved in the red zone
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| |<- RBX saved in the red zone
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| |<- paddings for stack realignment of 64 bytes
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|------------------|<- xsave buffer end aligned at 64 bytes
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| |<-
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| |<-
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| |<-
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|------------------|<- xsave buffer start at STATE_SAVE_OFFSET(%rsp)
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| |<- 8-byte padding for 64-byte alignment
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| |<- 8-byte padding for 64-byte alignment
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| |<- R11
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| |<- R10
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| |<- R9
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| |<- R8
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| |<- RDX
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| |<- RCX
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+==================+<- RSP aligned at 64 bytes
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Define TLSDESC_CALL_REGISTER_SAVE_AREA, the total register save area size
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for all integer registers by adding 24 to STATE_SAVE_OFFSET since RDI, RSI
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and RBX are saved onto stack without adjusting stack pointer first, using
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the red-zone. This fixes BZ #31501.
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Reviewed-by: Sunil K Pandey <skpgkp2@gmail.com>
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(cherry picked from commit 717ebfa85c8240d32d0d19d86a484c31c55c9617)
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diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c
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index d71e8d3d2e0e49f9..6fe1b728c607f39e 100644
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--- a/sysdeps/x86/cpu-features.c
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+++ b/sysdeps/x86/cpu-features.c
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@@ -310,7 +310,7 @@ update_active (struct cpu_features *cpu_features)
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/* NB: On AMX capable processors, ebx always includes AMX
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states. */
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unsigned int xsave_state_full_size
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- = ALIGN_UP (ebx + STATE_SAVE_OFFSET, 64);
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+ = ALIGN_UP (ebx + TLSDESC_CALL_REGISTER_SAVE_AREA, 64);
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cpu_features->xsave_state_size
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= xsave_state_full_size;
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@@ -400,8 +400,10 @@ update_active (struct cpu_features *cpu_features)
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unsigned int amx_size
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= (xstate_amx_comp_offsets[31]
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+ xstate_amx_comp_sizes[31]);
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- amx_size = ALIGN_UP (amx_size + STATE_SAVE_OFFSET,
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- 64);
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+ amx_size
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+ = ALIGN_UP ((amx_size
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+ + TLSDESC_CALL_REGISTER_SAVE_AREA),
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+ 64);
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/* Set xsave_state_full_size to the compact AMX
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state size for XSAVEC. NB: xsave_state_full_size
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is only used in _dl_tlsdesc_dynamic_xsave and
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@@ -409,7 +411,8 @@ update_active (struct cpu_features *cpu_features)
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cpu_features->xsave_state_full_size = amx_size;
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#endif
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cpu_features->xsave_state_size
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- = ALIGN_UP (size + STATE_SAVE_OFFSET, 64);
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+ = ALIGN_UP (size + TLSDESC_CALL_REGISTER_SAVE_AREA,
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+ 64);
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CPU_FEATURE_SET (cpu_features, XSAVEC);
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}
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}
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diff --git a/sysdeps/x86/sysdep.h b/sysdeps/x86/sysdep.h
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index db8e576e91767db5..7359149e17ccf341 100644
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--- a/sysdeps/x86/sysdep.h
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+++ b/sysdeps/x86/sysdep.h
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@@ -38,14 +38,59 @@
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#ifdef __x86_64__
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/* Offset for fxsave/xsave area used by _dl_runtime_resolve. Also need
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space to preserve RCX, RDX, RSI, RDI, R8, R9 and RAX. It must be
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- aligned to 16 bytes for fxsave and 64 bytes for xsave.
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-
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- NB: Is is non-zero because of the 128-byte red-zone. Some registers
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- are saved on stack without adjusting stack pointer first. When we
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- update stack pointer to allocate more space, we need to take the
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- red-zone into account. */
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+ aligned to 16 bytes for fxsave and 64 bytes for xsave. It is non-zero
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+ because MOV, instead of PUSH, is used to save registers onto stack.
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+
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+ +==================+<- stack frame start aligned at 8 or 16 bytes
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+ | |<- paddings for stack realignment of 64 bytes
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+ |------------------|<- xsave buffer end aligned at 64 bytes
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+ | |<-
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+ | |<-
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+ | |<-
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+ |------------------|<- xsave buffer start at STATE_SAVE_OFFSET(%rsp)
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+ | |<- 8-byte padding for 64-byte alignment
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+ | |<- R9
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+ | |<- R8
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+ | |<- RDI
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+ | |<- RSI
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+ | |<- RDX
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+ | |<- RCX
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+ | |<- RAX
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+ +==================+<- RSP aligned at 64 bytes
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+
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+ */
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# define STATE_SAVE_OFFSET (8 * 7 + 8)
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+/* _dl_tlsdesc_dynamic preserves RDI, RSI and RBX before realigning
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+ stack. After realigning stack, it saves RCX, RDX, R8, R9, R10 and
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+ R11. Allocate space for RDI, RSI and RBX to avoid clobbering saved
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+ RDI, RSI and RBX values on stack by xsave.
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+
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+ +==================+<- stack frame start aligned at 8 or 16 bytes
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+ | |<- RDI saved in the red zone
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+ | |<- RSI saved in the red zone
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+ | |<- RBX saved in the red zone
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+ | |<- paddings for stack realignment of 64 bytes
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+ |------------------|<- xsave buffer end aligned at 64 bytes
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+ | |<-
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+ | |<-
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+ | |<-
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+ |------------------|<- xsave buffer start at STATE_SAVE_OFFSET(%rsp)
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+ | |<- 8-byte padding for 64-byte alignment
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+ | |<- 8-byte padding for 64-byte alignment
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+ | |<- R11
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+ | |<- R10
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+ | |<- R9
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+ | |<- R8
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+ | |<- RDX
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+ | |<- RCX
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+ +==================+<- RSP aligned at 64 bytes
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+
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+ Define the total register save area size for all integer registers by
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+ adding 24 to STATE_SAVE_OFFSET since RDI, RSI and RBX are saved onto
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+ stack without adjusting stack pointer first, using the red-zone. */
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+# define TLSDESC_CALL_REGISTER_SAVE_AREA (STATE_SAVE_OFFSET + 24)
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+
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/* Save SSE, AVX, AVX512, mask, bound and APX registers. Bound and APX
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registers are mutually exclusive. */
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# define STATE_SAVE_MASK \
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@@ -66,8 +111,9 @@
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(STATE_SAVE_MASK | AMX_STATE_SAVE_MASK)
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#else
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/* Offset for fxsave/xsave area used by _dl_tlsdesc_dynamic. Since i386
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- doesn't have red-zone, use 0 here. */
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+ uses PUSH to save registers onto stack, use 0 here. */
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# define STATE_SAVE_OFFSET 0
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+# define TLSDESC_CALL_REGISTER_SAVE_AREA 0
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/* Save SSE, AVX, AXV512, mask and bound registers. */
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# define STATE_SAVE_MASK \
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diff --git a/sysdeps/x86_64/tst-gnu2-tls2mod1.S b/sysdeps/x86_64/tst-gnu2-tls2mod1.S
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new file mode 100644
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index 0000000000000000..1d636669ba255724
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--- /dev/null
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+++ b/sysdeps/x86_64/tst-gnu2-tls2mod1.S
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@@ -0,0 +1,87 @@
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+/* Check if TLSDESC relocation preserves %rdi, %rsi and %rbx.
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+ Copyright (C) 2024 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <http://www.gnu.org/licenses/>. */
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+
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+#include <sysdep.h>
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+
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+/* On AVX512 machines, OFFSET == 40 caused _dl_tlsdesc_dynamic_xsavec
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+ to clobber %rdi, %rsi and %rbx. On Intel AVX CPUs, the state size
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+ is 960 bytes and this test didn't fail. It may be due to the unused
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+ last 128 bytes. On AMD AVX CPUs, the state size is 832 bytes and
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+ this test might fail without the fix. */
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+#ifndef OFFSET
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+# define OFFSET 40
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+#endif
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+
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+ .text
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+ .p2align 4
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+ .globl apply_tls
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+ .type apply_tls, @function
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+apply_tls:
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+ cfi_startproc
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+ _CET_ENDBR
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+ pushq %rbp
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+ cfi_def_cfa_offset (16)
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+ cfi_offset (6, -16)
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+ movdqu (%RDI_LP), %xmm0
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+ lea tls_var1@TLSDESC(%rip), %RAX_LP
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+ mov %RSP_LP, %RBP_LP
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+ cfi_def_cfa_register (6)
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+ /* Align stack to 64 bytes. */
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+ and $-64, %RSP_LP
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+ sub $OFFSET, %RSP_LP
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+ pushq %rbx
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+ /* Set %ebx to 0xbadbeef. */
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+ movl $0xbadbeef, %ebx
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+ movl $0xbadbeef, %esi
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+ movq %rdi, saved_rdi(%rip)
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+ movq %rsi, saved_rsi(%rip)
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+ call *tls_var1@TLSCALL(%RAX_LP)
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+ /* Check if _dl_tlsdesc_dynamic preserves %rdi, %rsi and %rbx. */
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+ cmpq saved_rdi(%rip), %rdi
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+ jne L(hlt)
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+ cmpq saved_rsi(%rip), %rsi
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+ jne L(hlt)
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+ cmpl $0xbadbeef, %ebx
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+ jne L(hlt)
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+ add %fs:0, %RAX_LP
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+ movups %xmm0, 32(%RAX_LP)
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+ movdqu 16(%RDI_LP), %xmm1
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+ mov %RAX_LP, %RBX_LP
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+ movups %xmm1, 48(%RAX_LP)
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+ lea 32(%RBX_LP), %RAX_LP
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+ pop %rbx
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+ leave
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+ cfi_def_cfa (7, 8)
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+ ret
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+L(hlt):
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+ hlt
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+ cfi_endproc
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+ .size apply_tls, .-apply_tls
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+ .hidden tls_var1
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+ .globl tls_var1
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+ .section .tbss,"awT",@nobits
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+ .align 16
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+ .type tls_var1, @object
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+ .size tls_var1, 3200
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+tls_var1:
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+ .zero 3200
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+ .local saved_rdi
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+ .comm saved_rdi,8,8
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+ .local saved_rsi
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+ .comm saved_rsi,8,8
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+ .section .note.GNU-stack,"",@progbits
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