diff options
Diffstat (limited to 'arch/riscv64/kernel')
| -rw-r--r-- | arch/riscv64/kernel/entry.S (renamed from arch/riscv64/kernel/head.S) | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/arch/riscv64/kernel/head.S b/arch/riscv64/kernel/entry.S index cef74ba..0ff1a69 100644 --- a/arch/riscv64/kernel/head.S +++ b/arch/riscv64/kernel/entry.S @@ -81,16 +81,21 @@ handle_syscall: * restore its context */ /* TODO: is a whole function call necessary? */ mv s0, a0 + mv s1, a1 /* get current tcb */ call cur_tcb mv tp, a0 /* get associated kernel stack */ mv sp, tp addi sp, sp, -sizeof_registers + /* restore system call result */ + mv a0, s0 + mv a1, s1 j restore_noreturn restore_all: - lr s0, offsetof_s0(sp) + lr a0, offsetof_a0(sp) + lr a1, offsetof_a1(sp) restore_noreturn: /* restore registers besides possible return value, assume instruction @@ -103,13 +108,13 @@ restore_noreturn: lr t0, offsetof_t0(sp) lr t1, offsetof_t1(sp) lr t2, offsetof_t2(sp) - lr a0, offsetof_a0(sp) - lr a1, offsetof_a1(sp) + /* a0 and a1 should not be restored when coming from a syscall */ lr a2, offsetof_a2(sp) lr a3, offsetof_a3(sp) lr a4, offsetof_a4(sp) lr a5, offsetof_a5(sp) lr a6, offsetof_a6(sp) + lr s0, offsetof_s0(sp) lr s1, offsetof_s1(sp) lr s2, offsetof_s2(sp) lr s3, offsetof_s3(sp) |