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Subject[PATCH v9 08/17] riscv: Add vector struct and assembler definitions
Date
Add vector state context struct in struct thread and asm-offsets.c
definitions.

The vector registers will be saved in datap pointer of __riscv_v_state. It
will be dynamically allocated in kernel space. It will be put right after
the __riscv_v_state data structure in user space.

Co-developed-by: Vincent Chen <vincent.chen@sifive.com>
Signed-off-by: Vincent Chen <vincent.chen@sifive.com>
Signed-off-by: Greentime Hu <greentime.hu@sifive.com>
---
arch/riscv/include/asm/processor.h | 1 +
arch/riscv/include/uapi/asm/ptrace.h | 11 +++++++++++
arch/riscv/kernel/asm-offsets.c | 6 ++++++
3 files changed, 18 insertions(+)

diff --git a/arch/riscv/include/asm/processor.h b/arch/riscv/include/asm/processor.h
index 46b492c78cbb..a268f1382e52 100644
--- a/arch/riscv/include/asm/processor.h
+++ b/arch/riscv/include/asm/processor.h
@@ -35,6 +35,7 @@ struct thread_struct {
unsigned long s[12]; /* s[0]: frame pointer */
struct __riscv_d_ext_state fstate;
unsigned long bad_cause;
+ struct __riscv_v_state vstate;
};

/* Whitelist the fstate from the task_struct for hardened usercopy */
diff --git a/arch/riscv/include/uapi/asm/ptrace.h b/arch/riscv/include/uapi/asm/ptrace.h
index 882547f6bd5c..bd3b8a710246 100644
--- a/arch/riscv/include/uapi/asm/ptrace.h
+++ b/arch/riscv/include/uapi/asm/ptrace.h
@@ -77,6 +77,17 @@ union __riscv_fp_state {
struct __riscv_q_ext_state q;
};

+struct __riscv_v_state {
+ unsigned long vstart;
+ unsigned long vl;
+ unsigned long vtype;
+ unsigned long vcsr;
+ void *datap;
+#if __riscv_xlen == 32
+ __u32 __padding;
+#endif
+};
+
#endif /* __ASSEMBLY__ */

#endif /* _UAPI_ASM_RISCV_PTRACE_H */
diff --git a/arch/riscv/kernel/asm-offsets.c b/arch/riscv/kernel/asm-offsets.c
index 90f8ce64fa6f..34f43c84723a 100644
--- a/arch/riscv/kernel/asm-offsets.c
+++ b/arch/riscv/kernel/asm-offsets.c
@@ -72,6 +72,12 @@ void asm_offsets(void)
OFFSET(TSK_STACK_CANARY, task_struct, stack_canary);
#endif

+ OFFSET(RISCV_V_STATE_VSTART, __riscv_v_state, vstart);
+ OFFSET(RISCV_V_STATE_VL, __riscv_v_state, vl);
+ OFFSET(RISCV_V_STATE_VTYPE, __riscv_v_state, vtype);
+ OFFSET(RISCV_V_STATE_VCSR, __riscv_v_state, vcsr);
+ OFFSET(RISCV_V_STATE_DATAP, __riscv_v_state, datap);
+
DEFINE(PT_SIZE, sizeof(struct pt_regs));
OFFSET(PT_EPC, pt_regs, epc);
OFFSET(PT_RA, pt_regs, ra);
--
2.31.1
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