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fix trap return on M-Mode

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This commit is contained in:
WangRunji 2018-12-25 00:52:53 +08:00
parent 3de76885fa
commit af6d533cb5
2 changed files with 11 additions and 2 deletions
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5
kernel/src/arch/riscv32/boot/trap.asm
View File

@ -8,6 +8,7 @@
# XLENB
# LOAD
# STORE
# TEST_BACK_TO_KERNEL
.macro SAVE_ALL
# If coming from userspace, preserve the user stack pointer and load
@ -72,8 +73,8 @@ _save_context:
.macro RESTORE_ALL
LOAD s1, 32 # s1 = sstatus
LOAD s2, 33 # s2 = sepc
andi s0, s1, 1 << 8
bnez s0, _restore_context # back to S-mode? (sstatus.SPP = 1)
TEST_BACK_TO_KERNEL
bnez s0, _restore_context # s0 = back to kernel?
_save_kernel_sp:
addi s0, sp, 36*XLENB
csrw (xscratch), s0 # sscratch = kernel-sp

8
kernel/src/arch/riscv32/mod.rs
View File

@ -52,6 +52,10 @@ global_asm!("
.equ xcause, 0x342
.equ xtval, 0x343
.macro XRET\n mret\n .endm
.macro TEST_BACK_TO_KERNEL // s0 == back to kernel?
li s3, 3 << 11
and s0, s1, s3 // mstatus.MPP = 3
.endm
");
#[cfg(not(feature = "m_mode"))]
global_asm!("
@ -61,6 +65,10 @@ global_asm!("
.equ xcause, 0x142
.equ xtval, 0x143
.macro XRET\n sret\n .endm
.macro TEST_BACK_TO_KERNEL
andi s0, s1, 1 << 8 // sstatus.SPP = 1
.endm
");
#[cfg(target_pointer_width = "32")]