[RFC PATCH v4 09/13] riscv: Add vector struct and assembler definitions

[Greentime Hu]

From: Guo Ren <guo...@linux.alibaba.com>

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.

[greentime...@sifive.com: add support for dynamic vlen, add vcsr and remove
vxsat, vxrm because these data can be get in vcsr, add new macros for
_riscv_v_state elements offset and remove unused ones]
Signed-off-by: Greentime Hu <greentime...@sifive.com>
Signed-off-by: Guo Ren <guo...@linux.alibaba.com>
---
 arch/riscv/include/asm/processor.h   |  1 +
 arch/riscv/include/uapi/asm/ptrace.h | 13 +++++++++++++
 arch/riscv/kernel/asm-offsets.c      |  8 ++++++++
 3 files changed, 22 insertions(+)

diff --git a/arch/riscv/include/asm/processor.h 
b/arch/riscv/include/asm/processor.h
index 3ddb798264f1..217273375cfb 100644
--- a/arch/riscv/include/asm/processor.h
+++ b/arch/riscv/include/asm/processor.h
@@ -32,6 +32,7 @@ struct thread_struct {
        unsigned long sp;       /* Kernel mode stack */
        unsigned long s[12];    /* s[0]: frame pointer */
        struct __riscv_d_ext_state fstate;
+       struct __riscv_v_state vstate;
 };
 
 #define INIT_THREAD {                                  \
diff --git a/arch/riscv/include/uapi/asm/ptrace.h 
b/arch/riscv/include/uapi/asm/ptrace.h
index 882547f6bd5c..661b0466b850 100644
--- a/arch/riscv/include/uapi/asm/ptrace.h
+++ b/arch/riscv/include/uapi/asm/ptrace.h
@@ -77,6 +77,19 @@ union __riscv_fp_state {
        struct __riscv_q_ext_state q;
 };
 
+struct __riscv_v_state {
+       __u32 magic;
+       __u32 size;
+       unsigned long vstart;
+       unsigned long vl;
+       unsigned long vtype;
+       unsigned long vcsr;
+       void *datap;
+#if __riscv_xlen == 32
+       __u32 __padding;
+#endif
+} __attribute__((aligned(16)));
+
 #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 07cb9c10de4e..6627fde230b2 100644
--- a/arch/riscv/kernel/asm-offsets.c
+++ b/arch/riscv/kernel/asm-offsets.c
@@ -70,6 +70,14 @@ void asm_offsets(void)
        OFFSET(TASK_THREAD_F31, task_struct, thread.fstate.f[31]);
        OFFSET(TASK_THREAD_FCSR, task_struct, thread.fstate.fcsr);
 
+       OFFSET(RISCV_V_STATE_MAGIC, __riscv_v_state, magic);
+       OFFSET(RISCV_V_STATE_SIZE, __riscv_v_state, size);
+       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);
-- 
2.26.2