diff options
Diffstat (limited to 'debug_rom')
| -rw-r--r-- | debug_rom/Makefile | 20 | ||||
| -rwxr-xr-x | debug_rom/debug_rom.S | 105 | ||||
| -rw-r--r-- | debug_rom/debug_rom.c | 18 | ||||
| -rw-r--r-- | debug_rom/link.ld | 11 |
4 files changed, 0 insertions, 154 deletions
diff --git a/debug_rom/Makefile b/debug_rom/Makefile deleted file mode 100644 index 17cc95e..0000000 --- a/debug_rom/Makefile +++ /dev/null @@ -1,20 +0,0 @@ -# Recursive make is bad, but in this case we're cross compiling which is a -# pretty unusual use case. - -CC = $(RISCV)/bin/riscv64-unknown-elf-gcc -OBJCOPY = $(RISCV)/bin/riscv64-unknown-elf-objcopy - -%.o: %.S - $(CC) -c $< - -debug_rom.c: debug_rom.raw - xxd -i $^ > $@ - -debug_rom.raw: debug_rom - $(OBJCOPY) -O binary --only-section .text debug_rom debug_rom.raw - -debug_rom: debug_rom.o - $(CC) -nostdlib -nostartfiles -Tlink.ld -o $@ $^ - -clean: - rm -f debug_rom debug_rom.o debug_rom.raw debug_rom.c diff --git a/debug_rom/debug_rom.S b/debug_rom/debug_rom.S deleted file mode 100755 index 230f4b4..0000000 --- a/debug_rom/debug_rom.S +++ /dev/null @@ -1,105 +0,0 @@ -# This code should be functional. Doesn't have to be optimal. -# I'm writing it to prove that it can be done. - -# TODO: Update these constants once they're finalized in the doc. - -#define DCSR 0x790 -#define DCSR_CAUSE_DEBINT 3 -#define DCSR_HALT_OFFSET 3 -#define DCSR_DEBUGINT_OFFSET 10 - -#define DSCRATCH 0x792 - -#define MCPUID 0xf00 -#define MHARTID 0xf10 - -#define DEBUG_RAM 0x400 -#define DEBUG_RAM_SIZE 64 - -#define SETHALTNOT 0x100 -#define CLEARHALTNOT 0x104 -#define CLEARDEBINT 0x108 - - .global entry - .global resume - - # Automatically called when Debug Mode is first entered. -entry: j _entry - # Should be called by Debug RAM code that has finished execution and - # wants to return to Debug Mode. -resume: - # Clear debug interrupt. -clear_debint: - csrr s1, MHARTID - sw s1, CLEARDEBINT(zero) -clear_debint_loop: - csrr s1, DCSR - andi s1, s1, (1<<DCSR_DEBUGINT_OFFSET) - bnez s1, wait_for_interrupt - - # Restore s1. - csrr s1, MCPUID - bltz s1, restore_not_32 -restore_32: - lw s1, (DEBUG_RAM + DEBUG_RAM_SIZE - 4)(zero) - j check_halt -restore_not_32: - slli s1, s1, 1 - bltz s1, restore_128 -restore_64: - ld s1, (DEBUG_RAM + DEBUG_RAM_SIZE - 8)(zero) - j check_halt -restore_128: - nop #lq s1, (DEBUG_RAM + DEBUG_RAM_SIZE - 16)(zero) - -check_halt: - csrr s0, DCSR - andi s0, s0, (1<<DCSR_HALT_OFFSET) - beqz s0, exit - j wait_for_interrupt - -exit: - # Restore s0. - csrr s0, DSCRATCH - eret - - -_entry: - # Save s0 in DSCRATCH - csrw DSCRATCH, s0 - - # Check why we're here - csrr s0, DCSR - # cause is in bits 2:0 of dcsr - andi s0, s0, 7 - addi s0, s0, -DCSR_CAUSE_DEBINT - bnez s0, spontaneous_halt - -jdebugram: - # Save s1 so that the debug program can use two registers. - csrr s0, MCPUID - bltz s0, save_not_32 -save_32: - sw s1, (DEBUG_RAM + DEBUG_RAM_SIZE - 4)(zero) - jr zero, DEBUG_RAM -save_not_32: - slli s0, s0, 1 - bltz s0, save_128 -save_64: - sd s1, (DEBUG_RAM + DEBUG_RAM_SIZE - 8)(zero) - jr zero, DEBUG_RAM -save_128: - nop #sq s1, (DEBUG_RAM + DEBUG_RAM_SIZE - 16)(zero) - jr zero, DEBUG_RAM - -spontaneous_halt: - csrr s0, MHARTID - sw s0, SETHALTNOT(zero) - csrsi DCSR, DCSR_HALT_OFFSET - -wait_for_interrupt: - csrr s0, DCSR - andi s0, s0, (1<<DCSR_DEBUGINT_OFFSET) - beqz s0, wait_for_interrupt - - j jdebugram diff --git a/debug_rom/debug_rom.c b/debug_rom/debug_rom.c deleted file mode 100644 index 9d67df5..0000000 --- a/debug_rom/debug_rom.c +++ /dev/null @@ -1,18 +0,0 @@ -unsigned char debug_rom_raw[] = { - 0x6f, 0x00, 0x40, 0x05, 0xf3, 0x24, 0x00, 0xf1, 0x23, 0x24, 0x90, 0x10, - 0xf3, 0x24, 0x00, 0x79, 0x93, 0xf4, 0x04, 0x40, 0x63, 0x94, 0x04, 0x08, - 0xf3, 0x24, 0x00, 0xf0, 0x63, 0xc6, 0x04, 0x00, 0x83, 0x24, 0xc0, 0x43, - 0x6f, 0x00, 0x80, 0x01, 0x93, 0x94, 0x14, 0x00, 0x63, 0xc6, 0x04, 0x00, - 0x83, 0x34, 0x80, 0x43, 0x6f, 0x00, 0x80, 0x00, 0x13, 0x00, 0x00, 0x00, - 0x73, 0x24, 0x00, 0x79, 0x13, 0x74, 0x84, 0x00, 0x63, 0x04, 0x04, 0x00, - 0x6f, 0x00, 0x40, 0x05, 0x73, 0x24, 0x20, 0x79, 0x73, 0x00, 0x00, 0x10, - 0x73, 0x10, 0x24, 0x79, 0x73, 0x24, 0x00, 0x79, 0x13, 0x74, 0x74, 0x00, - 0x13, 0x04, 0xd4, 0xff, 0x63, 0x16, 0x04, 0x02, 0x73, 0x24, 0x00, 0xf0, - 0x63, 0x46, 0x04, 0x00, 0x23, 0x2e, 0x90, 0x42, 0x67, 0x00, 0x00, 0x40, - 0x13, 0x14, 0x14, 0x00, 0x63, 0x46, 0x04, 0x00, 0x23, 0x3c, 0x90, 0x42, - 0x67, 0x00, 0x00, 0x40, 0x13, 0x00, 0x00, 0x00, 0x67, 0x00, 0x00, 0x40, - 0x73, 0x24, 0x00, 0xf1, 0x23, 0x20, 0x80, 0x10, 0x73, 0xe0, 0x01, 0x79, - 0x73, 0x24, 0x00, 0x79, 0x13, 0x74, 0x04, 0x40, 0xe3, 0x0c, 0x04, 0xfe, - 0x6f, 0xf0, 0x1f, 0xfc -}; -unsigned int debug_rom_raw_len = 172; diff --git a/debug_rom/link.ld b/debug_rom/link.ld deleted file mode 100644 index 356099c..0000000 --- a/debug_rom/link.ld +++ /dev/null @@ -1,11 +0,0 @@ -OUTPUT_ARCH( "riscv" ) -ENTRY( entry ) -SECTIONS -{ - . = 0xfffff800; /* TODO: 0x800 */ - .text : - { - *(.text) - } - _end = .; -} |