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kernel-fxtec-pro1x/arch/arm64/include/uapi/asm/ptrace.h
Mark Rutland 8fe86bd474 KVM: arm64: Correct PSTATE on exception entry 
commit a425372e733177eb0779748956bc16c85167af48 upstream.

When KVM injects an exception into a guest, it generates the PSTATE
value from scratch, configuring PSTATE.{M[4:0],DAIF}, and setting all
other bits to zero.

This isn't correct, as the architecture specifies that some PSTATE bits
are (conditionally) cleared or set upon an exception, and others are
unchanged from the original context.

This patch adds logic to match the architectural behaviour. To make this
simple to follow/audit/extend, documentation references are provided,
and bits are configured in order of their layout in SPSR_EL2. This
layout can be seen in the diagram on ARM DDI 0487E.a page C5-429.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Alexandru Elisei <alexandru.elisei@arm.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20200108134324.46500-2-mark.rutland@arm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-02-11 04:33:57 -08:00

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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* Based on arch/arm/include/asm/ptrace.h
*
* Copyright (C) 1996-2003 Russell King
* Copyright (C) 2012 ARM Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _UAPI__ASM_PTRACE_H
#define _UAPI__ASM_PTRACE_H
#include <linux/types.h>
#include <asm/hwcap.h>
#include <asm/sigcontext.h>
/*
* PSR bits
*/
#define PSR_MODE_EL0t 0x00000000
#define PSR_MODE_EL1t 0x00000004
#define PSR_MODE_EL1h 0x00000005
#define PSR_MODE_EL2t 0x00000008
#define PSR_MODE_EL2h 0x00000009
#define PSR_MODE_EL3t 0x0000000c
#define PSR_MODE_EL3h 0x0000000d
#define PSR_MODE_MASK 0x0000000f
/* AArch32 CPSR bits */
#define PSR_MODE32_BIT 0x00000010
/* AArch64 SPSR bits */
#define PSR_F_BIT 0x00000040
#define PSR_I_BIT 0x00000080
#define PSR_A_BIT 0x00000100
#define PSR_D_BIT 0x00000200
#define PSR_SSBS_BIT 0x00001000
#define PSR_PAN_BIT 0x00400000
#define PSR_UAO_BIT 0x00800000
#define PSR_DIT_BIT 0x01000000
#define PSR_V_BIT 0x10000000
#define PSR_C_BIT 0x20000000
#define PSR_Z_BIT 0x40000000
#define PSR_N_BIT 0x80000000
/*
* Groups of PSR bits
*/
#define PSR_f 0xff000000 /* Flags */
#define PSR_s 0x00ff0000 /* Status */
#define PSR_x 0x0000ff00 /* Extension */
#define PSR_c 0x000000ff /* Control */
#ifndef __ASSEMBLY__
/*
* User structures for general purpose, floating point and debug registers.
*/
struct user_pt_regs {
__u64 regs[31];
__u64 sp;
__u64 pc;
__u64 pstate;
};
struct user_fpsimd_state {
__uint128_t vregs[32];
__u32 fpsr;
__u32 fpcr;
__u32 __reserved[2];
};
struct user_hwdebug_state {
__u32 dbg_info;
__u32 pad;
struct {
__u64 addr;
__u32 ctrl;
__u32 pad;
} dbg_regs[16];
};
/* SVE/FP/SIMD state (NT_ARM_SVE) */
struct user_sve_header {
__u32 size; /* total meaningful regset content in bytes */
__u32 max_size; /* maxmium possible size for this thread */
__u16 vl; /* current vector length */
__u16 max_vl; /* maximum possible vector length */
__u16 flags;
__u16 __reserved;
};
/* Definitions for user_sve_header.flags: */
#define SVE_PT_REGS_MASK (1 << 0)
#define SVE_PT_REGS_FPSIMD 0
#define SVE_PT_REGS_SVE SVE_PT_REGS_MASK
/*
* Common SVE_PT_* flags:
* These must be kept in sync with prctl interface in <linux/prctl.h>
*/
#define SVE_PT_VL_INHERIT ((1 << 17) /* PR_SVE_VL_INHERIT */ >> 16)
#define SVE_PT_VL_ONEXEC ((1 << 18) /* PR_SVE_SET_VL_ONEXEC */ >> 16)
/*
* The remainder of the SVE state follows struct user_sve_header. The
* total size of the SVE state (including header) depends on the
* metadata in the header: SVE_PT_SIZE(vq, flags) gives the total size
* of the state in bytes, including the header.
*
* Refer to <asm/sigcontext.h> for details of how to pass the correct
* "vq" argument to these macros.
*/
/* Offset from the start of struct user_sve_header to the register data */
#define SVE_PT_REGS_OFFSET \
((sizeof(struct user_sve_header) + (SVE_VQ_BYTES - 1)) \
/ SVE_VQ_BYTES * SVE_VQ_BYTES)
/*
* The register data content and layout depends on the value of the
* flags field.
*/
/*
* (flags & SVE_PT_REGS_MASK) == SVE_PT_REGS_FPSIMD case:
*
* The payload starts at offset SVE_PT_FPSIMD_OFFSET, and is of type
* struct user_fpsimd_state. Additional data might be appended in the
* future: use SVE_PT_FPSIMD_SIZE(vq, flags) to compute the total size.
* SVE_PT_FPSIMD_SIZE(vq, flags) will never be less than
* sizeof(struct user_fpsimd_state).
*/
#define SVE_PT_FPSIMD_OFFSET SVE_PT_REGS_OFFSET
#define SVE_PT_FPSIMD_SIZE(vq, flags) (sizeof(struct user_fpsimd_state))
/*
* (flags & SVE_PT_REGS_MASK) == SVE_PT_REGS_SVE case:
*
* The payload starts at offset SVE_PT_SVE_OFFSET, and is of size
* SVE_PT_SVE_SIZE(vq, flags).
*
* Additional macros describe the contents and layout of the payload.
* For each, SVE_PT_SVE_x_OFFSET(args) is the start offset relative to
* the start of struct user_sve_header, and SVE_PT_SVE_x_SIZE(args) is
* the size in bytes:
*
* x type description
* - ---- -----------
* ZREGS \
* ZREG |
* PREGS | refer to <asm/sigcontext.h>
* PREG |
* FFR /
*
* FPSR uint32_t FPSR
* FPCR uint32_t FPCR
*
* Additional data might be appended in the future.
*/
#define SVE_PT_SVE_ZREG_SIZE(vq) SVE_SIG_ZREG_SIZE(vq)
#define SVE_PT_SVE_PREG_SIZE(vq) SVE_SIG_PREG_SIZE(vq)
#define SVE_PT_SVE_FFR_SIZE(vq) SVE_SIG_FFR_SIZE(vq)
#define SVE_PT_SVE_FPSR_SIZE sizeof(__u32)
#define SVE_PT_SVE_FPCR_SIZE sizeof(__u32)
#define __SVE_SIG_TO_PT(offset) \
((offset) - SVE_SIG_REGS_OFFSET + SVE_PT_REGS_OFFSET)
#define SVE_PT_SVE_OFFSET SVE_PT_REGS_OFFSET
#define SVE_PT_SVE_ZREGS_OFFSET \
__SVE_SIG_TO_PT(SVE_SIG_ZREGS_OFFSET)
#define SVE_PT_SVE_ZREG_OFFSET(vq, n) \
__SVE_SIG_TO_PT(SVE_SIG_ZREG_OFFSET(vq, n))
#define SVE_PT_SVE_ZREGS_SIZE(vq) \
(SVE_PT_SVE_ZREG_OFFSET(vq, SVE_NUM_ZREGS) - SVE_PT_SVE_ZREGS_OFFSET)
#define SVE_PT_SVE_PREGS_OFFSET(vq) \
__SVE_SIG_TO_PT(SVE_SIG_PREGS_OFFSET(vq))
#define SVE_PT_SVE_PREG_OFFSET(vq, n) \
__SVE_SIG_TO_PT(SVE_SIG_PREG_OFFSET(vq, n))
#define SVE_PT_SVE_PREGS_SIZE(vq) \
(SVE_PT_SVE_PREG_OFFSET(vq, SVE_NUM_PREGS) - \
SVE_PT_SVE_PREGS_OFFSET(vq))
#define SVE_PT_SVE_FFR_OFFSET(vq) \
__SVE_SIG_TO_PT(SVE_SIG_FFR_OFFSET(vq))
#define SVE_PT_SVE_FPSR_OFFSET(vq) \
((SVE_PT_SVE_FFR_OFFSET(vq) + SVE_PT_SVE_FFR_SIZE(vq) + \
(SVE_VQ_BYTES - 1)) \
/ SVE_VQ_BYTES * SVE_VQ_BYTES)
#define SVE_PT_SVE_FPCR_OFFSET(vq) \
(SVE_PT_SVE_FPSR_OFFSET(vq) + SVE_PT_SVE_FPSR_SIZE)
/*
* Any future extension appended after FPCR must be aligned to the next
* 128-bit boundary.
*/
#define SVE_PT_SVE_SIZE(vq, flags) \
((SVE_PT_SVE_FPCR_OFFSET(vq) + SVE_PT_SVE_FPCR_SIZE \
- SVE_PT_SVE_OFFSET + (SVE_VQ_BYTES - 1)) \
/ SVE_VQ_BYTES * SVE_VQ_BYTES)
#define SVE_PT_SIZE(vq, flags) \
(((flags) & SVE_PT_REGS_MASK) == SVE_PT_REGS_SVE ? \
SVE_PT_SVE_OFFSET + SVE_PT_SVE_SIZE(vq, flags) \
: SVE_PT_FPSIMD_OFFSET + SVE_PT_FPSIMD_SIZE(vq, flags))
#endif /* __ASSEMBLY__ */
#endif /* _UAPI__ASM_PTRACE_H */
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