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lib: Redirect illegal instruction trap to S-mode when not handled

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Currently, we fail with error SBI_ENOTSUPP when we are not able
to handle illegal instruction trap. Instead, we should just
redirect illegal instruction trap to S-mode when not handled.

This redirection of illegal instruction trap will help lazy
save/restore of floating point registers to work correctly in
Linux kernel.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Anup Patel
2018-12-27 21:39:13 +05:30
committed by Anup Patel
parent 56e41f7a8d
commit 5959312a5c
4 changed files with 56 additions and 6 deletions
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9
include/sbi/riscv_encoding.h
View File

@@ -19,12 +19,15 @@
#define MSTATUS_HIE 0x00000004
#define MSTATUS_MIE 0x00000008
#define MSTATUS_UPIE 0x00000010
#define MSTATUS_SPIE 0x00000020
#define MSTATUS_SPIE_SHIFT 5
#define MSTATUS_SPIE (1UL << MSTATUS_SPIE_SHIFT)
#define MSTATUS_HPIE 0x00000040
#define MSTATUS_MPIE 0x00000080
#define MSTATUS_SPP 0x00000100
#define MSTATUS_SPP_SHIFT 8
#define MSTATUS_SPP (1UL << MSTATUS_SPP_SHIFT)
#define MSTATUS_HPP 0x00000600
#define MSTATUS_MPP 0x00001800
#define MSTATUS_MPP_SHIFT 11
#define MSTATUS_MPP (3UL << MSTATUS_MPP_SHIFT)
#define MSTATUS_FS 0x00006000
#define MSTATUS_XS 0x00018000
#define MSTATUS_MPRV 0x00020000

4
include/sbi/sbi_trap.h
View File

@@ -51,6 +51,10 @@ struct sbi_trap_regs {
struct sbi_scratch;
int sbi_trap_redirect(struct sbi_trap_regs *regs,
struct sbi_scratch *scratch,
ulong epc, ulong cause, ulong tval);
void sbi_trap_handler(struct sbi_trap_regs *regs,
struct sbi_scratch *scratch);