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 <[email protected]>
Signed-off-by: Vincent Chen <[email protected]>
Signed-off-by: Greentime Hu <[email protected]>
---
arch/riscv/include/asm/processor.h | 1 +
arch/riscv/include/uapi/asm/ptrace.h | 17 +++++++++++++++++
arch/riscv/kernel/asm-offsets.c | 6 ++++++
3 files changed, 24 insertions(+)
diff --git a/arch/riscv/include/asm/processor.h b/arch/riscv/include/asm/processor.h
index 0749924d9e55..91f1c318328e 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..6ee1ca2edfa7 100644
--- a/arch/riscv/include/uapi/asm/ptrace.h
+++ b/arch/riscv/include/uapi/asm/ptrace.h
@@ -77,6 +77,23 @@ 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;
+ /*
+ * In signal handler, datap will be set a correct user stack offset
+ * and vector registers will be copied to the address of datap
+ * pointer.
+ *
+ * In ptrace syscall, datap will be set to zero and the vector
+ * registers will be copied to the address right after this
+ * structure.
+ */
+};
+
#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 df9444397908..37e3e6a8d877 100644
--- a/arch/riscv/kernel/asm-offsets.c
+++ b/arch/riscv/kernel/asm-offsets.c
@@ -75,6 +75,12 @@ 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);
--
2.17.1