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[ocd-firmware] minor edits

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stnolting 2024-12-28 19:54:55 +01:00
parent a0205ec172
commit 79bf7fd58f
1 changed files with 6 additions and 6 deletions
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12
sw/ocd-firmware/park_loop.S
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@ -16,7 +16,7 @@
.option norvc
.global _ocd_start
.global entry_exception
.global entry_normal
.global entry_park
// debug module (DM) address map
.equ DM_CODE_BASE, 0xFFFFFE00 // base address of code ROM (park loop)
@ -40,11 +40,11 @@ _ocd_start:
entry_exception:
sw zero, (DM_SREG_BASE+ACK_EXC)(zero) // send exception-acknowledge (no need for a hart ID)
csrr x8, dscratch0 // restore x8 from dscratch0 (might be changed during PBUF execution)
ebreak // re-enter debug mode (at "entry_normal" entry point)
nop
ebreak // re-enter debug mode (at "entry_park" entry point)
nop // dummy to align the address of "entry_park"
// BASE + 16: normal entry - ebreak in debug-mode, halt request or return from single-stepped instruction
entry_normal:
// BASE + 16: normal entry - halt CPU: ebreak in debug-mode, halt request or return from single-stepped instruction
entry_park:
csrw dscratch0, x8 // backup x8 to dscratch0 so we have a GPR available
csrr x8, mhartid // get hart ID (0..3)
sw x8, (DM_SREG_BASE+ACK_HLT)(zero) // send halt-acknowledge
@ -68,7 +68,7 @@ resume:
csrr x8, dscratch0 // restore x8 from dscratch0
dret // exit debug mode
// execute program buffer (implicit ebreak at the end of the buffer will bring us back to 'entry_normal')
// execute program buffer (implicit ebreak at the end of the buffer will bring us back to "entry_park")
execute:
csrr x8, mhartid // get hart ID (0..3)
sw x8, (DM_SREG_BASE+ACK_EXE)(zero) // send execute-acknowledge