Unverified Commit 06d0e372 authored by Guo Ren's avatar Guo Ren Committed by Palmer Dabbelt
Browse files

riscv: compat: Add basic compat data type implementation 



Implement riscv asm/compat.h for struct compat_xxx,
is_compat_task, compat_user_regset, regset convert.

The rv64 compat.h has inherited most of the structs
from the generic one.

Signed-off-by: default avatarGuo Ren <guoren@linux.alibaba.com>
Signed-off-by: default avatarGuo Ren <guoren@kernel.org>
Tested-by: default avatarHeiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20220405071314.3225832-10-guoren@kernel.org


Signed-off-by: default avatarPalmer Dabbelt <palmer@rivosinc.com>
parent 72f045d1

arch/riscv/include/asm/compat.h

0 → 100644
+129 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0-only */

#ifndef __ASM_COMPAT_H

#define __ASM_COMPAT_H



#define COMPAT_UTS_MACHINE	"riscv\0\0"



/*

 * Architecture specific compatibility types

 */

#include <linux/types.h>

#include <linux/sched.h>

#include <linux/sched/task_stack.h>

#include <asm-generic/compat.h>



static inline int is_compat_task(void)

{

	return test_thread_flag(TIF_32BIT);

}



struct compat_user_regs_struct {

	compat_ulong_t pc;

	compat_ulong_t ra;

	compat_ulong_t sp;

	compat_ulong_t gp;

	compat_ulong_t tp;

	compat_ulong_t t0;

	compat_ulong_t t1;

	compat_ulong_t t2;

	compat_ulong_t s0;

	compat_ulong_t s1;

	compat_ulong_t a0;

	compat_ulong_t a1;

	compat_ulong_t a2;

	compat_ulong_t a3;

	compat_ulong_t a4;

	compat_ulong_t a5;

	compat_ulong_t a6;

	compat_ulong_t a7;

	compat_ulong_t s2;

	compat_ulong_t s3;

	compat_ulong_t s4;

	compat_ulong_t s5;

	compat_ulong_t s6;

	compat_ulong_t s7;

	compat_ulong_t s8;

	compat_ulong_t s9;

	compat_ulong_t s10;

	compat_ulong_t s11;

	compat_ulong_t t3;

	compat_ulong_t t4;

	compat_ulong_t t5;

	compat_ulong_t t6;

};



static inline void regs_to_cregs(struct compat_user_regs_struct *cregs,

				 struct pt_regs *regs)

{

	cregs->pc	= (compat_ulong_t) regs->epc;

	cregs->ra	= (compat_ulong_t) regs->ra;

	cregs->sp	= (compat_ulong_t) regs->sp;

	cregs->gp	= (compat_ulong_t) regs->gp;

	cregs->tp	= (compat_ulong_t) regs->tp;

	cregs->t0	= (compat_ulong_t) regs->t0;

	cregs->t1	= (compat_ulong_t) regs->t1;

	cregs->t2	= (compat_ulong_t) regs->t2;

	cregs->s0	= (compat_ulong_t) regs->s0;

	cregs->s1	= (compat_ulong_t) regs->s1;

	cregs->a0	= (compat_ulong_t) regs->a0;

	cregs->a1	= (compat_ulong_t) regs->a1;

	cregs->a2	= (compat_ulong_t) regs->a2;

	cregs->a3	= (compat_ulong_t) regs->a3;

	cregs->a4	= (compat_ulong_t) regs->a4;

	cregs->a5	= (compat_ulong_t) regs->a5;

	cregs->a6	= (compat_ulong_t) regs->a6;

	cregs->a7	= (compat_ulong_t) regs->a7;

	cregs->s2	= (compat_ulong_t) regs->s2;

	cregs->s3	= (compat_ulong_t) regs->s3;

	cregs->s4	= (compat_ulong_t) regs->s4;

	cregs->s5	= (compat_ulong_t) regs->s5;

	cregs->s6	= (compat_ulong_t) regs->s6;

	cregs->s7	= (compat_ulong_t) regs->s7;

	cregs->s8	= (compat_ulong_t) regs->s8;

	cregs->s9	= (compat_ulong_t) regs->s9;

	cregs->s10	= (compat_ulong_t) regs->s10;

	cregs->s11	= (compat_ulong_t) regs->s11;

	cregs->t3	= (compat_ulong_t) regs->t3;

	cregs->t4	= (compat_ulong_t) regs->t4;

	cregs->t5	= (compat_ulong_t) regs->t5;

	cregs->t6	= (compat_ulong_t) regs->t6;

};



static inline void cregs_to_regs(struct compat_user_regs_struct *cregs,

				 struct pt_regs *regs)

{

	regs->epc	= (unsigned long) cregs->pc;

	regs->ra	= (unsigned long) cregs->ra;

	regs->sp	= (unsigned long) cregs->sp;

	regs->gp	= (unsigned long) cregs->gp;

	regs->tp	= (unsigned long) cregs->tp;

	regs->t0	= (unsigned long) cregs->t0;

	regs->t1	= (unsigned long) cregs->t1;

	regs->t2	= (unsigned long) cregs->t2;

	regs->s0	= (unsigned long) cregs->s0;

	regs->s1	= (unsigned long) cregs->s1;

	regs->a0	= (unsigned long) cregs->a0;

	regs->a1	= (unsigned long) cregs->a1;

	regs->a2	= (unsigned long) cregs->a2;

	regs->a3	= (unsigned long) cregs->a3;

	regs->a4	= (unsigned long) cregs->a4;

	regs->a5	= (unsigned long) cregs->a5;

	regs->a6	= (unsigned long) cregs->a6;

	regs->a7	= (unsigned long) cregs->a7;

	regs->s2	= (unsigned long) cregs->s2;

	regs->s3	= (unsigned long) cregs->s3;

	regs->s4	= (unsigned long) cregs->s4;

	regs->s5	= (unsigned long) cregs->s5;

	regs->s6	= (unsigned long) cregs->s6;

	regs->s7	= (unsigned long) cregs->s7;

	regs->s8	= (unsigned long) cregs->s8;

	regs->s9	= (unsigned long) cregs->s9;

	regs->s10	= (unsigned long) cregs->s10;

	regs->s11	= (unsigned long) cregs->s11;

	regs->t3	= (unsigned long) cregs->t3;

	regs->t4	= (unsigned long) cregs->t4;

	regs->t5	= (unsigned long) cregs->t5;

	regs->t6	= (unsigned long) cregs->t6;

};



#endif /* __ASM_COMPAT_H */

arch/riscv/include/asm/thread_info.h

+1 −0
Original line number Diff line number Diff line
@@ -97,6 +97,7 @@ struct thread_info { 
#define TIF_SECCOMP		8	/* syscall secure computing */

#define TIF_NOTIFY_SIGNAL	9	/* signal notifications exist */

#define TIF_UPROBE		10	/* uprobe breakpoint or singlestep */

#define TIF_32BIT		11	/* compat-mode 32bit process */



#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)

#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)