From: guoren@kernel.org
To: paul.walmsley@sifive.com, palmer@dabbelt.com, Anup.Patel@wdc.com,
greentime.hu@sifive.com
Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
arnd@arndb.de, linux-csky@vger.kernel.org,
linux-riscv@lists.infradead.org,
Guo Ren <guoren@linux.alibaba.com>,
Dave Martin <Dave.Martin@arm.com>
Subject: [RFC PATCH V3 11/11] riscv: Add sigcontext save/restore
Date: Sun, 8 Mar 2020 17:49:54 +0800 [thread overview]
Message-ID: <20200308094954.13258-12-guoren@kernel.org> (raw)
In-Reply-To: <20200308094954.13258-1-guoren@kernel.org>
From: Guo Ren <guoren@linux.alibaba.com>
This patch add sigcontext save/restore and it's very similar to
fpu.
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
---
arch/riscv/include/uapi/asm/sigcontext.h | 1 +
arch/riscv/kernel/signal.c | 40 ++++++++++++++++++++++++
2 files changed, 41 insertions(+)
diff --git a/arch/riscv/include/uapi/asm/sigcontext.h b/arch/riscv/include/uapi/asm/sigcontext.h
index 84f2dfcfdbce..f74b3c814423 100644
--- a/arch/riscv/include/uapi/asm/sigcontext.h
+++ b/arch/riscv/include/uapi/asm/sigcontext.h
@@ -17,6 +17,7 @@
struct sigcontext {
struct user_regs_struct sc_regs;
union __riscv_fp_state sc_fpregs;
+ struct __riscv_v_state sc_vregs;
};
#endif /* _UAPI_ASM_RISCV_SIGCONTEXT_H */
diff --git a/arch/riscv/kernel/signal.c b/arch/riscv/kernel/signal.c
index 17ba190e84a5..4295c00e8934 100644
--- a/arch/riscv/kernel/signal.c
+++ b/arch/riscv/kernel/signal.c
@@ -83,6 +83,40 @@ static long save_fp_state(struct pt_regs *regs,
#define restore_fp_state(task, regs) (0)
#endif
+#ifdef CONFIG_VECTOR
+static long restore_v_state(struct pt_regs *regs,
+ struct __riscv_v_state *sc_vregs)
+{
+ long err;
+ struct __riscv_v_state __user *state = sc_vregs;
+
+ err = __copy_from_user(¤t->thread.vstate, state, sizeof(*state));
+ if (unlikely(err))
+ return err;
+
+ vstate_restore(current, regs);
+
+ return err;
+}
+
+static long save_v_state(struct pt_regs *regs,
+ struct __riscv_v_state *sc_vregs)
+{
+ long err;
+ struct __riscv_v_state __user *state = sc_vregs;
+
+ vstate_save(current, regs);
+ err = __copy_to_user(state, ¤t->thread.vstate, sizeof(*state));
+ if (unlikely(err))
+ return err;
+
+ return err;
+}
+#else
+#define save_v_state(task, regs) (0)
+#define restore_v_state(task, regs) (0)
+#endif
+
static long restore_sigcontext(struct pt_regs *regs,
struct sigcontext __user *sc)
{
@@ -92,6 +126,9 @@ static long restore_sigcontext(struct pt_regs *regs,
/* Restore the floating-point state. */
if (has_fpu)
err |= restore_fp_state(regs, &sc->sc_fpregs);
+ /* Restore the vector state. */
+ if (has_vector)
+ err |= restore_v_state(regs, &sc->sc_vregs);
return err;
}
@@ -145,6 +182,9 @@ static long setup_sigcontext(struct rt_sigframe __user *frame,
/* Save the floating-point state. */
if (has_fpu)
err |= save_fp_state(regs, &sc->sc_fpregs);
+ /* Save the vector state. */
+ if (has_vector)
+ err |= save_v_state(regs, &sc->sc_vregs);
return err;
}
--
2.17.0
next prev parent reply other threads:[~2020-03-08 9:53 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-08 9:49 [RFC PATCH V3 00/11] riscv: Add vector ISA support guoren
2020-03-08 9:49 ` [RFC PATCH V3 01/11] riscv: Separate patch for cflags and aflags guoren
2020-03-08 9:49 ` [RFC PATCH V3 02/11] riscv: Rename __switch_to_aux -> fpu guoren
2020-03-08 9:49 ` [RFC PATCH V3 03/11] riscv: Extending cpufeature.c to detect V-extension guoren
2020-03-08 9:49 ` [RFC PATCH V3 04/11] riscv: Add CSR defines related to VECTOR extension guoren
2020-03-08 9:49 ` [RFC PATCH V3 05/11] riscv: Add vector feature to compile guoren
2020-03-08 9:49 ` [RFC PATCH V3 06/11] riscv: Add has_vector detect guoren
2020-03-08 9:49 ` [RFC PATCH V3 07/11] riscv: Reset vector register guoren
2020-03-08 9:49 ` [RFC PATCH V3 08/11] riscv: Add vector struct and assembler definitions guoren
2020-03-08 9:49 ` [RFC PATCH V3 09/11] riscv: Add task switch support for VECTOR guoren
2020-03-08 9:49 ` [RFC PATCH V3 10/11] riscv: Add ptrace support guoren
2020-03-08 9:49 ` guoren [this message]
2020-03-09 3:41 ` [RFC PATCH V3 00/11] riscv: Add vector ISA support Greentime Hu
2020-03-09 10:27 ` LIU Zhiwei
2020-03-10 8:54 ` Greentime Hu
2020-03-10 9:19 ` Greentime Hu
2020-03-12 3:14 ` LIU Zhiwei
2020-03-23 4:00 ` Greentime Hu
2020-03-24 3:41 ` Guo Ren
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