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ARM: introduce svc_pt_regs structure

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Since the privileged mode pt_regs are an extended version of the saved
userland pt_regs, introduce a new svc_pt_regs structure to describe this
layout.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Russell King
2016-05-13 10:22:38 +01:00
parent 5745eef6b8
commit e6a9dc6129
4 changed files with 14 additions and 4 deletions
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4
arch/arm/include/asm/assembler.h
View File

@@ -480,13 +480,13 @@ THUMB( orr \reg , \reg , #PSR_T_BIT )
.macro uaccess_save, tmp
#ifdef CONFIG_CPU_SW_DOMAIN_PAN
mrc p15, 0, \tmp, c3, c0, 0
str \tmp, [sp, #PT_REGS_SIZE]
str \tmp, [sp, #SVC_DACR]
#endif
.endm
.macro uaccess_restore
#ifdef CONFIG_CPU_SW_DOMAIN_PAN
ldr r0, [sp, #PT_REGS_SIZE]
ldr r0, [sp, #SVC_DACR]
mcr p15, 0, r0, c3, c0, 0
#endif
.endm

8
arch/arm/include/asm/ptrace.h
View File

@@ -13,10 +13,18 @@
#include <uapi/asm/ptrace.h>
#ifndef __ASSEMBLY__
#include <linux/types.h>
struct pt_regs {
unsigned long uregs[18];
};
struct svc_pt_regs {
struct pt_regs regs;
u32 dacr;
u32 unused;
};
#define user_mode(regs) \
(((regs)->ARM_cpsr & 0xf) == 0)