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riscv: compat: Add basic compat data type implementation
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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: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20220405071314.3225832-10-guoren@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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Guo Ren authored and Palmer Dabbelt committed Apr 26, 2022
1 parent 72f045d commit 06d0e37
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129 changes: 129 additions & 0 deletions arch/riscv/include/asm/compat.h
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Original file line number Diff line number Diff line change
@@ -0,0 +1,129 @@
/* 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 */
1 change: 1 addition & 0 deletions arch/riscv/include/asm/thread_info.h
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Original file line number Diff line number Diff line change
Expand Up @@ -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)
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