forked from Minki/linux
6c23e2ff70
In A64, XZR and the SP share the same encoding (31), and whether an instruction accesses XZR or SP for a particular register parameter depends on the definition of the instruction. We store the SP in pt_regs::regs[31], and thus when emulating instructions, we must be careful to not erroneously read from or write back to the saved SP. Unfortunately, we often fail to be this careful. In all cases, instructions using a transfer register parameter Xt use this to refer to XZR rather than SP. This patch adds helpers so that we can more easily and consistently handle these cases. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
253 lines
6.9 KiB
C
253 lines
6.9 KiB
C
/*
|
|
* 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 __ASM_PTRACE_H
|
|
#define __ASM_PTRACE_H
|
|
|
|
#include <uapi/asm/ptrace.h>
|
|
|
|
/* Current Exception Level values, as contained in CurrentEL */
|
|
#define CurrentEL_EL1 (1 << 2)
|
|
#define CurrentEL_EL2 (2 << 2)
|
|
|
|
/* AArch32-specific ptrace requests */
|
|
#define COMPAT_PTRACE_GETREGS 12
|
|
#define COMPAT_PTRACE_SETREGS 13
|
|
#define COMPAT_PTRACE_GET_THREAD_AREA 22
|
|
#define COMPAT_PTRACE_SET_SYSCALL 23
|
|
#define COMPAT_PTRACE_GETVFPREGS 27
|
|
#define COMPAT_PTRACE_SETVFPREGS 28
|
|
#define COMPAT_PTRACE_GETHBPREGS 29
|
|
#define COMPAT_PTRACE_SETHBPREGS 30
|
|
|
|
/* AArch32 CPSR bits */
|
|
#define COMPAT_PSR_MODE_MASK 0x0000001f
|
|
#define COMPAT_PSR_MODE_USR 0x00000010
|
|
#define COMPAT_PSR_MODE_FIQ 0x00000011
|
|
#define COMPAT_PSR_MODE_IRQ 0x00000012
|
|
#define COMPAT_PSR_MODE_SVC 0x00000013
|
|
#define COMPAT_PSR_MODE_ABT 0x00000017
|
|
#define COMPAT_PSR_MODE_HYP 0x0000001a
|
|
#define COMPAT_PSR_MODE_UND 0x0000001b
|
|
#define COMPAT_PSR_MODE_SYS 0x0000001f
|
|
#define COMPAT_PSR_T_BIT 0x00000020
|
|
#define COMPAT_PSR_F_BIT 0x00000040
|
|
#define COMPAT_PSR_I_BIT 0x00000080
|
|
#define COMPAT_PSR_A_BIT 0x00000100
|
|
#define COMPAT_PSR_E_BIT 0x00000200
|
|
#define COMPAT_PSR_J_BIT 0x01000000
|
|
#define COMPAT_PSR_Q_BIT 0x08000000
|
|
#define COMPAT_PSR_V_BIT 0x10000000
|
|
#define COMPAT_PSR_C_BIT 0x20000000
|
|
#define COMPAT_PSR_Z_BIT 0x40000000
|
|
#define COMPAT_PSR_N_BIT 0x80000000
|
|
#define COMPAT_PSR_IT_MASK 0x0600fc00 /* If-Then execution state mask */
|
|
#define COMPAT_PSR_GE_MASK 0x000f0000
|
|
|
|
#ifdef CONFIG_CPU_BIG_ENDIAN
|
|
#define COMPAT_PSR_ENDSTATE COMPAT_PSR_E_BIT
|
|
#else
|
|
#define COMPAT_PSR_ENDSTATE 0
|
|
#endif
|
|
|
|
/*
|
|
* These are 'magic' values for PTRACE_PEEKUSR that return info about where a
|
|
* process is located in memory.
|
|
*/
|
|
#define COMPAT_PT_TEXT_ADDR 0x10000
|
|
#define COMPAT_PT_DATA_ADDR 0x10004
|
|
#define COMPAT_PT_TEXT_END_ADDR 0x10008
|
|
#ifndef __ASSEMBLY__
|
|
#include <linux/bug.h>
|
|
|
|
/* sizeof(struct user) for AArch32 */
|
|
#define COMPAT_USER_SZ 296
|
|
|
|
/* Architecturally defined mapping between AArch32 and AArch64 registers */
|
|
#define compat_usr(x) regs[(x)]
|
|
#define compat_fp regs[11]
|
|
#define compat_sp regs[13]
|
|
#define compat_lr regs[14]
|
|
#define compat_sp_hyp regs[15]
|
|
#define compat_lr_irq regs[16]
|
|
#define compat_sp_irq regs[17]
|
|
#define compat_lr_svc regs[18]
|
|
#define compat_sp_svc regs[19]
|
|
#define compat_lr_abt regs[20]
|
|
#define compat_sp_abt regs[21]
|
|
#define compat_lr_und regs[22]
|
|
#define compat_sp_und regs[23]
|
|
#define compat_r8_fiq regs[24]
|
|
#define compat_r9_fiq regs[25]
|
|
#define compat_r10_fiq regs[26]
|
|
#define compat_r11_fiq regs[27]
|
|
#define compat_r12_fiq regs[28]
|
|
#define compat_sp_fiq regs[29]
|
|
#define compat_lr_fiq regs[30]
|
|
|
|
/*
|
|
* This struct defines the way the registers are stored on the stack during an
|
|
* exception. Note that sizeof(struct pt_regs) has to be a multiple of 16 (for
|
|
* stack alignment). struct user_pt_regs must form a prefix of struct pt_regs.
|
|
*/
|
|
struct pt_regs {
|
|
union {
|
|
struct user_pt_regs user_regs;
|
|
struct {
|
|
u64 regs[31];
|
|
u64 sp;
|
|
u64 pc;
|
|
u64 pstate;
|
|
};
|
|
};
|
|
u64 orig_x0;
|
|
u64 syscallno;
|
|
u64 orig_addr_limit;
|
|
u64 unused; // maintain 16 byte alignment
|
|
};
|
|
|
|
#define MAX_REG_OFFSET offsetof(struct pt_regs, pstate)
|
|
|
|
#define arch_has_single_step() (1)
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
#define compat_thumb_mode(regs) \
|
|
(((regs)->pstate & COMPAT_PSR_T_BIT))
|
|
#else
|
|
#define compat_thumb_mode(regs) (0)
|
|
#endif
|
|
|
|
#define user_mode(regs) \
|
|
(((regs)->pstate & PSR_MODE_MASK) == PSR_MODE_EL0t)
|
|
|
|
#define compat_user_mode(regs) \
|
|
(((regs)->pstate & (PSR_MODE32_BIT | PSR_MODE_MASK)) == \
|
|
(PSR_MODE32_BIT | PSR_MODE_EL0t))
|
|
|
|
#define processor_mode(regs) \
|
|
((regs)->pstate & PSR_MODE_MASK)
|
|
|
|
#define interrupts_enabled(regs) \
|
|
(!((regs)->pstate & PSR_I_BIT))
|
|
|
|
#define fast_interrupts_enabled(regs) \
|
|
(!((regs)->pstate & PSR_F_BIT))
|
|
|
|
#define GET_USP(regs) \
|
|
(!compat_user_mode(regs) ? (regs)->sp : (regs)->compat_sp)
|
|
|
|
#define SET_USP(ptregs, value) \
|
|
(!compat_user_mode(regs) ? ((regs)->sp = value) : ((regs)->compat_sp = value))
|
|
|
|
extern int regs_query_register_offset(const char *name);
|
|
extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
|
|
unsigned int n);
|
|
|
|
/**
|
|
* regs_get_register() - get register value from its offset
|
|
* @regs: pt_regs from which register value is gotten
|
|
* @offset: offset of the register.
|
|
*
|
|
* regs_get_register returns the value of a register whose offset from @regs.
|
|
* The @offset is the offset of the register in struct pt_regs.
|
|
* If @offset is bigger than MAX_REG_OFFSET, this returns 0.
|
|
*/
|
|
static inline u64 regs_get_register(struct pt_regs *regs, unsigned int offset)
|
|
{
|
|
u64 val = 0;
|
|
|
|
WARN_ON(offset & 7);
|
|
|
|
offset >>= 3;
|
|
switch (offset) {
|
|
case 0 ... 30:
|
|
val = regs->regs[offset];
|
|
break;
|
|
case offsetof(struct pt_regs, sp) >> 3:
|
|
val = regs->sp;
|
|
break;
|
|
case offsetof(struct pt_regs, pc) >> 3:
|
|
val = regs->pc;
|
|
break;
|
|
case offsetof(struct pt_regs, pstate) >> 3:
|
|
val = regs->pstate;
|
|
break;
|
|
default:
|
|
val = 0;
|
|
}
|
|
|
|
return val;
|
|
}
|
|
|
|
/*
|
|
* Read a register given an architectural register index r.
|
|
* This handles the common case where 31 means XZR, not SP.
|
|
*/
|
|
static inline unsigned long pt_regs_read_reg(const struct pt_regs *regs, int r)
|
|
{
|
|
return (r == 31) ? 0 : regs->regs[r];
|
|
}
|
|
|
|
/*
|
|
* Write a register given an architectural register index r.
|
|
* This handles the common case where 31 means XZR, not SP.
|
|
*/
|
|
static inline void pt_regs_write_reg(struct pt_regs *regs, int r,
|
|
unsigned long val)
|
|
{
|
|
if (r != 31)
|
|
regs->regs[r] = val;
|
|
}
|
|
|
|
/* Valid only for Kernel mode traps. */
|
|
static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
|
|
{
|
|
return regs->sp;
|
|
}
|
|
|
|
static inline unsigned long regs_return_value(struct pt_regs *regs)
|
|
{
|
|
return regs->regs[0];
|
|
}
|
|
|
|
/* We must avoid circular header include via sched.h */
|
|
struct task_struct;
|
|
int valid_user_regs(struct user_pt_regs *regs, struct task_struct *task);
|
|
|
|
#define GET_IP(regs) ((unsigned long)(regs)->pc)
|
|
#define SET_IP(regs, value) ((regs)->pc = ((u64) (value)))
|
|
|
|
#define GET_FP(ptregs) ((unsigned long)(ptregs)->regs[29])
|
|
#define SET_FP(ptregs, value) ((ptregs)->regs[29] = ((u64) (value)))
|
|
|
|
#include <asm-generic/ptrace.h>
|
|
|
|
#define procedure_link_pointer(regs) ((regs)->regs[30])
|
|
|
|
static inline void procedure_link_pointer_set(struct pt_regs *regs,
|
|
unsigned long val)
|
|
{
|
|
procedure_link_pointer(regs) = val;
|
|
}
|
|
|
|
#undef profile_pc
|
|
extern unsigned long profile_pc(struct pt_regs *regs);
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
#endif
|