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[ocd-firmware] register renaming

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stnolting 2023-07-17 20:51:41 +02:00
parent 71e03880b1
commit 7b24a44338
1 changed files with 8 additions and 8 deletions
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16
sw/ocd-firmware/park_loop.S
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@ -63,26 +63,26 @@ entry_exception:
// BASE + 8: normale entry - ebreak in debug-mode, halt request or return from single-stepped instruction
entry_normal:
csrw dscratch0, s0 // backup s0 to dscratch0 so we have a GPR available
csrw dscratch0, x8 // backup x8 to dscratch0 so we have a GPR available
// polling loop - waiting for requests
park_loop:
sb zero, (DM_SREG_BASE+SREG_HLT_ACK)(zero) // ACK that CPU is halted
lbu s0, (DM_SREG_BASE+SREG_EXE_REQ)(zero) // request to execute program buffer?
bnez s0, execute
lbu s0, (DM_SREG_BASE+SREG_RES_REQ)(zero) // request to resume?
beqz s0, park_loop
lbu x8, (DM_SREG_BASE+SREG_EXE_REQ)(zero) // request to execute program buffer?
bnez x8, execute
lbu x8, (DM_SREG_BASE+SREG_RES_REQ)(zero) // request to resume?
beqz x8, park_loop
// resume normal operation
resume:
sb s0, (DM_SREG_BASE+SREG_RES_ACK)(zero) // ACK that CPU is about to resume
csrr s0, dscratch0 // restore s0 from dscratch0
sb x8, (DM_SREG_BASE+SREG_RES_ACK)(zero) // ACK that CPU is about to resume
csrr x8, dscratch0 // restore x8 from dscratch0
dret // exit debug mode
// execute program buffer
execute:
sb zero, (DM_SREG_BASE+SREG_EXE_ACK)(zero) // ACK that execution is about to start
csrr s0, dscratch0 // restore s0 from dscratch0
csrr x8, dscratch0 // restore x8 from dscratch0
fence.i // synchronize ifetch / i-cache & prefetch with memory (PBUF)
jalr zero, zero, %lo(DM_PBUF_BASE) // jump to beginning of program buffer (PBUF)