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354cabcb26
_dl_tlsdesc_dynamic preserves RDI, RSI and RBX before realigning stack.
After realigning stack, it saves RCX, RDX, R8, R9, R10 and R11. Define
TLSDESC_CALL_REGISTER_SAVE_AREA to allocate space for RDI, RSI and RBX
to avoid clobbering saved RDI, RSI and RBX values on stack by xsave to
STATE_SAVE_OFFSET(%rsp).
+==================+<- stack frame start aligned at 8 or 16 bytes
| |<- RDI saved in the red zone
| |<- RSI saved in the red zone
| |<- RBX saved in the red zone
| |<- paddings for stack realignment of 64 bytes
|------------------|<- xsave buffer end aligned at 64 bytes
| |<-
| |<-
| |<-
|------------------|<- xsave buffer start at STATE_SAVE_OFFSET(%rsp)
| |<- 8-byte padding for 64-byte alignment
| |<- 8-byte padding for 64-byte alignment
| |<- R11
| |<- R10
| |<- R9
| |<- R8
| |<- RDX
| |<- RCX
+==================+<- RSP aligned at 64 bytes
Define TLSDESC_CALL_REGISTER_SAVE_AREA, the total register save area size
for all integer registers by adding 24 to STATE_SAVE_OFFSET since RDI, RSI
and RBX are saved onto stack without adjusting stack pointer first, using
the red-zone. This fixes BZ #31501.
Reviewed-by: Sunil K Pandey <skpgkp2@gmail.com>
(cherry picked from commit 717ebfa85c)
183 lines
6.4 KiB
C
183 lines
6.4 KiB
C
/* Assembler macros for x86.
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Copyright (C) 2017-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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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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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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<https://www.gnu.org/licenses/>. */
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#ifndef _X86_SYSDEP_H
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#define _X86_SYSDEP_H 1
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#include <sysdeps/generic/sysdep.h>
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/* The extended state feature IDs in the state component bitmap. */
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#define X86_XSTATE_X87_ID 0
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#define X86_XSTATE_SSE_ID 1
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#define X86_XSTATE_AVX_ID 2
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#define X86_XSTATE_BNDREGS_ID 3
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#define X86_XSTATE_BNDCFG_ID 4
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#define X86_XSTATE_K_ID 5
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#define X86_XSTATE_ZMM_H_ID 6
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#define X86_XSTATE_ZMM_ID 7
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#define X86_XSTATE_PKRU_ID 9
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#define X86_XSTATE_TILECFG_ID 17
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#define X86_XSTATE_TILEDATA_ID 18
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#define X86_XSTATE_APX_F_ID 19
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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. It is non-zero
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because MOV, instead of PUSH, is used to save registers onto stack.
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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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# 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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+==================+<- 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 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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/* 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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((1 << X86_XSTATE_SSE_ID) \
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| (1 << X86_XSTATE_AVX_ID) \
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| (1 << X86_XSTATE_BNDREGS_ID) \
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| (1 << X86_XSTATE_K_ID) \
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| (1 << X86_XSTATE_ZMM_H_ID) \
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| (1 << X86_XSTATE_ZMM_ID) \
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| (1 << X86_XSTATE_APX_F_ID))
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/* AMX state mask. */
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# define AMX_STATE_SAVE_MASK \
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((1 << X86_XSTATE_TILECFG_ID) | (1 << X86_XSTATE_TILEDATA_ID))
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/* States to be included in xsave_state_full_size. */
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# define FULL_STATE_SAVE_MASK \
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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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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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((1 << X86_XSTATE_SSE_ID) \
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| (1 << X86_XSTATE_AVX_ID) \
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| (1 << X86_XSTATE_BNDREGS_ID) \
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| (1 << X86_XSTATE_K_ID) \
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| (1 << X86_XSTATE_ZMM_H_ID))
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/* States to be included in xsave_state_size. */
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# define FULL_STATE_SAVE_MASK STATE_SAVE_MASK
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#endif
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/* States which should be saved for TLSDESC_CALL and TLS_DESC_CALL.
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Compiler assumes that all registers, including AMX and x87 FPU
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stack registers, are unchanged after CALL, except for EFLAGS and
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RAX/EAX. */
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#define TLSDESC_CALL_STATE_SAVE_MASK \
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(FULL_STATE_SAVE_MASK | (1 << X86_XSTATE_X87_ID))
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/* Constants for bits in __x86_string_control: */
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/* Avoid short distance REP MOVSB. */
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#define X86_STRING_CONTROL_AVOID_SHORT_DISTANCE_REP_MOVSB (1 << 0)
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#ifdef __ASSEMBLER__
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/* Syntactic details of assembler. */
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/* ELF uses byte-counts for .align, most others use log2 of count of bytes. */
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#define ALIGNARG(log2) 1<<log2
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#define ASM_SIZE_DIRECTIVE(name) .size name,.-name;
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/* Common entry 16 byte aligns. */
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#define ENTRY(name) ENTRY_P2ALIGN (name, 4)
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#undef END
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#define END(name) \
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cfi_endproc; \
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ASM_SIZE_DIRECTIVE(name)
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#define ENTRY_CHK(name) ENTRY (name)
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#define END_CHK(name) END (name)
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/* Since C identifiers are not normally prefixed with an underscore
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on this system, the asm identifier `syscall_error' intrudes on the
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C name space. Make sure we use an innocuous name. */
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#define syscall_error __syscall_error
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#define mcount _mcount
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#undef PSEUDO_END
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#define PSEUDO_END(name) \
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END (name)
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/* Local label name for asm code. */
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#ifndef L
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/* ELF-like local names start with `.L'. */
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# define LOCAL_LABEL(name) .L##name
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# define L(name) LOCAL_LABEL(name)
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#endif
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#define atom_text_section .section ".text.atom", "ax"
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#endif /* __ASSEMBLER__ */
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#endif /* _X86_SYSDEP_H */
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