reduce one instruction when switch to irq stack

2019-10-06 23:32:09 +08:00
parent 93ae1c96ca
commit ae3ada8dfe
4 changed files with 29 additions and 27 deletions
--- a/arch/risc-v/rv32i/gcc/port_s.S
+++ b/arch/risc-v/rv32i/gcc/port_s.S
@@ -226,7 +226,6 @@ port_context_switch:
    sw x30, __reg_x30_OFFSET(sp)
    sw x31, __reg_x31_OFFSET(sp)

-
    sw     ra,  __reg_mepc_OFFSET(sp)

    csrr   t0,  mstatus
@@ -324,12 +323,10 @@ rv32_exception_entry:
    mv      t0, sp
    la      t1, k_irq_stk_top
    lw      sp, (t1)
-    andi    sp, sp, 0xFFFFFFF0
    sw      t0, (sp)

-
    // get irq num and call irq handler
-    li      t0,  SOC_MCAUSE_EXP_MASK
+    li      t0,  MCAUSE_EXP_CODE_MASK
    csrr    a0,  mcause
    and     a0,  a0, t0
    call    cpu_irq_entry