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Use csr_read() to read sstatus instead of inline assembly.

Browse source 
While here, remove a local variable to avoid the CSR read in non-debug
kernels.

Reviewed by:	mhorne
MFC after:	1 week
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D23511
This commit is contained in:
John Baldwin 2020-02-05 20:32:37 +00:00
parent b68892fe61
commit ac2b208d08
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=357594
1 changed files with 4 additions and 8 deletions
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12
sys/riscv/riscv/trap.c
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@ -245,12 +245,10 @@ void
do_trap_supervisor(struct trapframe *frame)
{
uint64_t exception;
uint64_t sstatus;
/* Ensure we came from supervisor mode, interrupts disabled */
__asm __volatile("csrr %0, sstatus" : "=&r" (sstatus));
KASSERT((sstatus & (SSTATUS_SPP | SSTATUS_SIE)) == SSTATUS_SPP,
("We must came from S mode with interrupts disabled"));
KASSERT((csr_read(sstatus) & (SSTATUS_SPP | SSTATUS_SIE)) ==
SSTATUS_SPP, ("Came from S mode with interrupts enabled"));
exception = (frame->tf_scause & EXCP_MASK);
if (frame->tf_scause & EXCP_INTR) {
@ -305,7 +303,6 @@ do_trap_user(struct trapframe *frame)
{
uint64_t exception;
struct thread *td;
uint64_t sstatus;
struct pcb *pcb;
td = curthread;
@ -313,9 +310,8 @@ do_trap_user(struct trapframe *frame)
pcb = td->td_pcb;
/* Ensure we came from usermode, interrupts disabled */
__asm __volatile("csrr %0, sstatus" : "=&r" (sstatus));
KASSERT((sstatus & (SSTATUS_SPP | SSTATUS_SIE)) == 0,
("We must came from U mode with interrupts disabled"));
KASSERT((csr_read(sstatus) & (SSTATUS_SPP | SSTATUS_SIE)) == 0,
("Came from U mode with interrupts enabled"));
exception = (frame->tf_scause & EXCP_MASK);
if (frame->tf_scause & EXCP_INTR) {