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save 48bytes when no need to switch task in interrupt handler

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acevest
2019-10-06 15:51:34 +08:00
parent e5e905e9bb
commit b147d060fb
7 changed files with 72 additions and 198 deletions
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140
arch/risc-v/rv32i/gcc/port_s.S
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@@ -12,10 +12,10 @@
.global port_sched_start
.global port_context_switch
.global rv32_exception_entry
.extern k_curr_task
.extern k_next_task
.extern k_task_irq_switch_flag
.equ MSTATUS_MIE, 0x00000008
.equ MSTATUS_MPP, 0x00001800
@@ -236,7 +236,43 @@ port_context_switch:
.align 2
.global rv32_exception_entry
rv32_exception_entry:
addi sp, sp, -32*REGBYTES
addi sp, sp, -20*REGBYTES
sw ra, (12-12)*REGBYTES(sp)
sw gp, (13-12)*REGBYTES(sp)
sw tp, (14-12)*REGBYTES(sp)
sw t0, (15-12)*REGBYTES(sp)
sw t1, (16-12)*REGBYTES(sp)
sw t2, (17-12)*REGBYTES(sp)
sw t3, (18-12)*REGBYTES(sp)
sw t4, (19-12)*REGBYTES(sp)
sw t5, (20-12)*REGBYTES(sp)
sw t6, (21-12)*REGBYTES(sp)
sw a0, (22-12)*REGBYTES(sp)
sw a1, (23-12)*REGBYTES(sp)
sw a2, (24-12)*REGBYTES(sp)
sw a3, (25-12)*REGBYTES(sp)
sw a4, (26-12)*REGBYTES(sp)
sw a5, (27-12)*REGBYTES(sp)
sw a6, (28-12)*REGBYTES(sp)
sw a7, (29-12)*REGBYTES(sp)
csrr t0, mepc
sw t0, (30-12)*REGBYTES(sp)
csrr t0, mstatus
sw t0, (31-12)*REGBYTES(sp)
// get irq num and call irq handler
li t0, SOC_MCAUSE_EXP_MASK
csrr a0, mcause
and a0, a0, t0
call cpu_irq_entry
la t0, k_curr_task
la t1, k_next_task
beq t0, t1, irq_restore
addi sp, sp, -12*REGBYTES
sw s0, 0*REGBYTES(sp)
sw s1, 1*REGBYTES(sp)
sw s2, 2*REGBYTES(sp)
@@ -250,49 +286,6 @@ rv32_exception_entry:
sw s10, 10*REGBYTES(sp)
sw s11, 11*REGBYTES(sp)
// caller save
sw ra, 12*REGBYTES(sp)
sw gp, 13*REGBYTES(sp)
sw tp, 14*REGBYTES(sp)
sw t0, 15*REGBYTES(sp)
sw t1, 16*REGBYTES(sp)
sw t2, 17*REGBYTES(sp)
sw t3, 18*REGBYTES(sp)
sw t4, 19*REGBYTES(sp)
sw t5, 20*REGBYTES(sp)
sw t6, 21*REGBYTES(sp)
sw a0, 22*REGBYTES(sp)
sw a1, 23*REGBYTES(sp)
sw a2, 24*REGBYTES(sp)
sw a3, 25*REGBYTES(sp)
sw a4, 26*REGBYTES(sp)
sw a5, 27*REGBYTES(sp)
sw a6, 28*REGBYTES(sp)
sw a7, 29*REGBYTES(sp)
csrr t0, mepc
sw t0, 30*REGBYTES(sp)
csrr t0, mstatus
sw t0, 31*REGBYTES(sp)
// save sp to k_curr_task.sp
la t0, k_curr_task // t0 = &k_curr_task
lw t1, (t0)
sw sp, (t1)
csrr a0, mcause
mv a1, sp
li t0, SOC_MCAUSE_EXP_MASK
and a0, a0, t0
call cpu_irq_entry
la t0, k_curr_task
la t1, k_next_task
beq t0, t1, irq_restore
// save sp to k_curr_task.sp
la t0, k_curr_task // t0 = &k_curr_task
lw t2, (t0) // t2 = k_curr_task->sp
@@ -305,15 +298,6 @@ rv32_exception_entry:
// load new task sp
lw sp, (t1)
irq_restore:
// restore context
lw t0, 30*REGBYTES(sp)
csrw mepc, t0
lw t0, 31*REGBYTES(sp)
csrw mstatus, t0
lw s0, 0*REGBYTES(sp)
lw s1, 1*REGBYTES(sp)
lw s2, 2*REGBYTES(sp)
@@ -326,27 +310,35 @@ irq_restore:
lw s9, 9*REGBYTES(sp)
lw s10, 10*REGBYTES(sp)
lw s11, 11*REGBYTES(sp)
addi sp, sp, 12*REGBYTES
// caller save
lw ra, 12*REGBYTES(sp)
lw gp, 13*REGBYTES(sp)
lw tp, 14*REGBYTES(sp)
lw t0, 15*REGBYTES(sp)
lw t1, 16*REGBYTES(sp)
lw t2, 17*REGBYTES(sp)
lw t3, 18*REGBYTES(sp)
lw t4, 19*REGBYTES(sp)
lw t5, 20*REGBYTES(sp)
lw t6, 21*REGBYTES(sp)
lw a0, 22*REGBYTES(sp)
lw a1, 23*REGBYTES(sp)
lw a2, 24*REGBYTES(sp)
lw a3, 25*REGBYTES(sp)
lw a4, 26*REGBYTES(sp)
lw a5, 27*REGBYTES(sp)
lw a6, 28*REGBYTES(sp)
lw a7, 29*REGBYTES(sp)
addi sp, sp, 32*REGBYTES
irq_restore:
// restore context
lw t0, (30-12)*REGBYTES(sp)
csrw mepc, t0
lw t0, (31-12)*REGBYTES(sp)
csrw mstatus, t0
lw ra, (12-12)*REGBYTES(sp)
lw gp, (13-12)*REGBYTES(sp)
lw tp, (14-12)*REGBYTES(sp)
lw t0, (15-12)*REGBYTES(sp)
lw t1, (16-12)*REGBYTES(sp)
lw t2, (17-12)*REGBYTES(sp)
lw t3, (18-12)*REGBYTES(sp)
lw t4, (19-12)*REGBYTES(sp)
lw t5, (20-12)*REGBYTES(sp)
lw t6, (21-12)*REGBYTES(sp)
lw a0, (22-12)*REGBYTES(sp)
lw a1, (23-12)*REGBYTES(sp)
lw a2, (24-12)*REGBYTES(sp)
lw a3, (25-12)*REGBYTES(sp)
lw a4, (26-12)*REGBYTES(sp)
lw a5, (27-12)*REGBYTES(sp)
lw a6, (28-12)*REGBYTES(sp)
lw a7, (29-12)*REGBYTES(sp)
addi sp, sp, 20*REGBYTES
mret