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c58c8faac3
7 changed files with 1540 additions and 0 deletions
1
.gitignore
vendored
Normal file
1
.gitignore
vendored
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@ -0,0 +1 @@
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build/
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53
Makefile
Normal file
53
Makefile
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@ -0,0 +1,53 @@
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CFLAGS?=-O3 --opt-code-speed
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PLATFORM?=ti8x
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CC=$(shell which zcc z88dk.zcc | head -1)
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LD=$(CC)
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SHELL=bash
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BUILD=build
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wilder_card=$(wildcard $(1)/**/$(2)) $(wildcard $(1)/$(2))
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define source_directory
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$(eval $(1)=$(2))
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$(eval $(1)_FILES=$(call wilder_card,$(2),*.s) $(call wilder_card,$(2),*.c))
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$(eval $(1)_OBJECT_FILES=$$(subst $(2)/,$$(BUILD)/$(2)/,$$(patsubst %.s,%.o,$$(patsubst %.c,%.o,$$($(1)_FILES)))))
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$(eval vpath %.c $(2))
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$(eval vpath %.s $(2))
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endef
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$(call source_directory,SRC,src)
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# It's extremely important that the source file paths are absolute, otherwise the
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# extension will have trouble mapping the paths.
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define source_compile
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mkdir -p "$(dir $@)"
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$(CC) +$(PLATFORM) $(CFLAGS) $(1) -o "$@" "$(realpath $<)"
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endef
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.ONESHELL:
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all: $(BUILD)/gdb.lib
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clean:
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rm -rf build
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$(BUILD):
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@mkdir -p "$@"
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$(BUILD)/gdb.lib: $(BUILD)/gdb.lst $(SRC_OBJECT_FILES)
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cd $(BUILD) && z88dk.z88dk-z80asm -d -xgdb "@$(subst $(BUILD)/,,$<)"
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$(BUILD)/gdb.lst: | $(BUILD)
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echo > "$@"
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for each in $(SRC_FILES) ; do
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echo $${each%.*} >> "$@"
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done
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.PRECIOUS: $(BUILD)/%.o
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$(BUILD)/%.o: %.s | $(BUILD)
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$(call source_compile,-c)
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.PRECIOUS: $(BUILD)/%.o
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$(BUILD)/%.o: %.c | $(BUILD)
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$(call source_compile,-c)
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11
README.md
Normal file
11
README.md
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@ -0,0 +1,11 @@
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# z88dk-gdbstub
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A GDB stub library for z88dk z80 projects. You must implement the following
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functions in your program for it to compile:
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* unsigned char gdb_getDebugChar (void)
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* void gdb_putDebugChar (unsigned char ch)
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Other functions will also be needed to do anything useful.
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See [The template project for TI 8x calculators](https://github.com/empathicqubit/z88dk-ti8xp-template) for an example implementation.
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142
src/gdb.c
Normal file
142
src/gdb.c
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@ -0,0 +1,142 @@
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#include "lib.h"
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#include "gdb.h"
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// All publicly exported functions go here
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void gdb_exception (int ex) __naked {
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__asm
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ld (__gdb_state+R_SP), sp
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LOAD_SP
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call __gdb_save_cpu_state
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ld hl, 0
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push hl
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#ifdef __SDCC_gbz80
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ld hl, __gdb_state + R_SP
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ld a, (hl+)
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ld h, (hl)
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ld l, a
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#else
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ld hl, (__gdb_state + R_SP)
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#endif
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inc hl
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inc hl
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ld e, (hl)
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inc hl
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ld d, (hl)
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push de
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call __gdb_stub_main
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__endasm;
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(void)ex;
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}
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#ifdef DBG_HWBREAK
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#ifndef DBG_HWBREAK_SIZE
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#define DBG_HWBREAK_SIZE 0
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#endif /* DBG_HWBREAK_SIZE */
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void
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gdb_hwbreak (void) __naked
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{
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__asm
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ld (__gdb_state + R_SP), sp
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LOAD_SP
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call __gdb_save_cpu_state
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ld hl, -DBG_HWBREAK_SIZE
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push hl
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ld hl, EX_HWBREAK
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push hl
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call __gdb_stub_main
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__endasm;
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}
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#endif /* DBG_HWBREAK_SET */
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void gdb_int(void) __naked {
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__asm
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ld (__gdb_state + R_SP), sp
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LOAD_SP
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call __gdb_save_cpu_state
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ld hl, 0 ;pc_adj
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push hl
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ld hl, DBG_INT_EX
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push hl
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ld hl, __gdb_stub_main
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push hl
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push hl
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ei
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reti
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__endasm;
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}
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#ifndef __SDCC_gbz80
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void gdb_nmi(void) __naked {
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__asm
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ld (__gdb_state + R_SP), sp
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LOAD_SP
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call __gdb_save_cpu_state
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ld hl, 0 ;pc_adj
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push hl
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ld hl, DBG_NMI_EX
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push hl
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ld hl, __gdb_stub_main
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push hl
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push hl
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retn
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__endasm;
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}
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#endif
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#ifdef DBG_SWBREAK
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#ifdef DBG_SWBREAK_RST
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#define DBG_SWBREAK_SIZE 1
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#else
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#define DBG_SWBREAK_SIZE 3
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#endif
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void gdb_swbreak (void) __naked {
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__asm
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ld (__gdb_state + R_SP), sp
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LOAD_SP
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call __gdb_save_cpu_state
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ld hl, -DBG_SWBREAK_SIZE
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push hl
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ld hl, EX_SWBREAK
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push hl
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call __gdb_stub_main
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;.globl _break_handler
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#ifdef DBG_SWBREAK_RST
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_break_handler = DBG_SWBREAK_RST
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#else
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_break_handler = _gdb_swbreak
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#endif
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__endasm;
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}
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#endif /* DBG_SWBREAK */
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void gdb_set_enter(void (*func)(void)) {
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_gdb_enter_func = func;
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}
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void gdb_set_hwbreak_toggle(int (*func)(int set, void *addr)) {
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_gdb_toggle_hwbreak = func;
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}
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#ifdef DBG_TOGGLESTEP
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void gdb_set_step_toggle(int (*func)(int set)) {
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_gdb_toggle_step = func;
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}
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#endif
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||||||
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#ifdef DGB_SWBREAK
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void gdb_set_swbreak_toggle(int (*func)(int set, void *addr)) {
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_gdb_toggle_swbreak = func;
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}
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#endif
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// Set calls to here in the holes, then remove them when we
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// reenter
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#if defined(DBG_TOGGLESTEP) && defined(DBG_SWBREAK)
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void gdb_step (void) __naked {
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__asm
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jp _gdb_swbreak
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__endasm
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}
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#endif
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68
src/gdb.h
Normal file
68
src/gdb.h
Normal file
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@ -0,0 +1,68 @@
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|
#ifndef __GDB_GDB_H__
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#define __GDB_GDB_H__
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#include "lib.h"
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#define export(returntype, signature) { \
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returntype signature; \
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extern returntype __LIB__ signature; \
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}
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||||||
|
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||||||
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/* These functions must be defined by the application */
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unsigned char gdb_getDebugChar(void);
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void gdb_putDebugChar(unsigned char ch);
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||||||
|
|
||||||
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/* This file contains the library exports. */
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||||||
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||||||
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/* Enter to debug mode from software or hardware breakpoint.
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Assume address of next instruction after breakpoint call is on top of stack.
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Do JP _gdb_swbreak or JP _gdb_hwbreak from RST handler, for example.
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||||||
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*/
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export(void, gdb_swbreak(void) __naked);
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export(void, gdb_hwbreak(void) __naked);
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export(void, gdb_step(void) __naked);
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export(void, gdb_step (void));
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|
export(void, gdb_exception (int ex) __naked);
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||||||
|
|
||||||
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/* Jump to this function from NMI handler. Just replace RETN instruction by
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JP _gdb_nmi
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Use if NMI detects request to enter to debug mode.
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||||||
|
*/
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export(void, gdb_nmi (void) __naked);
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||||||
|
|
||||||
|
/* Jump to this function from INT handler. Just replace EI+RETI instructions by
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JP _gdb_int
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Use if INT detects request to enter to debug mode.
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||||||
|
*/
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||||||
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export(void, gdb_int (void) __naked);
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||||||
|
|
||||||
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/* Prints to debugger console. */
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||||||
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export(void, gdb_print(const char *str));
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||||||
|
|
||||||
|
/* Set the function which gets a packet character. This is required. */
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||||||
|
export(void, gdb_set_get_char(unsigned char (*getter)(void)));
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||||||
|
|
||||||
|
/* Set the function which puts a packet character. This is required. */
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||||||
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export(void, gdb_set_put_char(void (*putter)(unsigned char)));
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||||||
|
|
||||||
|
/* Set the function which turns a software break in a particular location on or off */
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||||||
|
export(void, gdb_set_swbreak_toggle(int (*func)(int set, void *addr)));
|
||||||
|
|
||||||
|
/* Set the function which turns a hardware break in a particular location on or off */
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||||||
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export(void, gdb_set_hwbreak_toggle(int (*func)(int set, void *addr)));
|
||||||
|
|
||||||
|
/* Set the function which turns line stepping on or off */
|
||||||
|
export(void, gdb_set_step_toggle(int (*func)(int set)));
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||||||
|
|
||||||
|
/* Set the function which is called when the debugger is entered */
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||||||
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export(void, gdb_set_enter(void (*func)(void)));
|
||||||
|
|
||||||
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/* Enter to debug mode (after receiving BREAK from GDB, for example)
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||||||
|
* Assume:
|
||||||
|
* program PC in (SP+0)
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||||||
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* caught signal in (SP+2)
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||||||
|
* program SP is SP+4
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||||||
|
*/
|
||||||
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export(void, gdb_exception (int ex));
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||||||
|
|
||||||
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#endif // __GDB_GDB_H__
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||||||
254
src/lib.h
Normal file
254
src/lib.h
Normal file
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|
@ -0,0 +1,254 @@
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||||||
|
#ifndef __GDB_LIB_H__
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||||||
|
#define __GDB_LIB_H__
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||||||
|
|
||||||
|
typedef unsigned char byte;
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||||||
|
typedef unsigned short word;
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||||||
|
|
||||||
|
/* This file contains stuff internal to the library */
|
||||||
|
|
||||||
|
/* Usage:
|
||||||
|
1. Copy this file to project directory
|
||||||
|
2. Configure it commenting/uncommenting macros below or define DBG_CONFIGURED
|
||||||
|
and all required macros and then include this file to one of your C-source
|
||||||
|
files.
|
||||||
|
3. Implement gdb_getDebugChar() and gdb_putDebugChar(), functions must not return
|
||||||
|
until data received or sent.
|
||||||
|
4. Implement all optional functions used to toggle breakpoints/watchpoints,
|
||||||
|
if supported. Do not write fuctions to toggle software breakpoints if
|
||||||
|
you unsure (GDB will do itself).
|
||||||
|
5. Implement serial port initialization routine called at program start.
|
||||||
|
6. Add necessary debugger entry points to your program, for example:
|
||||||
|
.org 0x08 ;RST 8 handler
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||||||
|
jp _gdb_swbreak
|
||||||
|
...
|
||||||
|
.org 0x66 ;NMI handler
|
||||||
|
jp _gdb_nmi
|
||||||
|
...
|
||||||
|
main_loop:
|
||||||
|
halt
|
||||||
|
call isDbgInterrupt
|
||||||
|
jr z,101$
|
||||||
|
ld hl, 2 ;EX_SIGINT
|
||||||
|
push hl
|
||||||
|
call _debug_exception
|
||||||
|
101$:
|
||||||
|
...
|
||||||
|
7. Compile file using SDCC (supported ports are: z80, z180, z80n, gbz80 and
|
||||||
|
ez80_z80), do not use --peep-asm option. For example:
|
||||||
|
$ sdcc -mz80 --opt-code-size --max-allocs-per-node 50000 z80-stub.c
|
||||||
|
*/
|
||||||
|
/******************************************************************************\
|
||||||
|
Configuration
|
||||||
|
\******************************************************************************/
|
||||||
|
#ifndef DBG_CONFIGURED
|
||||||
|
/* Uncomment this line, if stub size is critical for you */
|
||||||
|
//#define DBG_MIN_SIZE
|
||||||
|
|
||||||
|
/* Comment this line out if software breakpoints are unsupported.
|
||||||
|
If you have special function to toggle software breakpoints, then provide
|
||||||
|
here name of these function. Expected prototype:
|
||||||
|
int _gdb_toggle_swbreak(int set, void *addr);
|
||||||
|
function must return 0 on success. */
|
||||||
|
#define DBG_SWBREAK _gdb_toggle_swbreak
|
||||||
|
|
||||||
|
/* Define the function to disable and enable software stepping
|
||||||
|
int _gdb_toggle_step(int set);
|
||||||
|
*/
|
||||||
|
#define DBG_TOGGLESTEP _gdb_toggle_step
|
||||||
|
|
||||||
|
/* Define if one of standard RST handlers is used as software
|
||||||
|
breakpoint entry point */
|
||||||
|
//#define DBG_SWBREAK_RST 0x08
|
||||||
|
|
||||||
|
/* if platform supports hardware breakpoints then define following macro
|
||||||
|
by name of function. Fuction must have next prototype:
|
||||||
|
int _gdb_toggle_hwbreak(int set, void *addr);
|
||||||
|
function must return 0 on success. */
|
||||||
|
#define DBG_HWBREAK _gdb_toggle_hwbreak
|
||||||
|
|
||||||
|
/* if platform supports hardware watchpoints then define all or some of
|
||||||
|
following macros by names of functions. Fuctions prototypes:
|
||||||
|
int toggle_watch(int set, void *addr, size_t size); // memory write watch
|
||||||
|
int toggle_rwatch(int set, void *addr, size_t size); // memory read watch
|
||||||
|
int toggle_awatch(int set, void *addr, size_t size); // memory access watch
|
||||||
|
function must return 0 on success. */
|
||||||
|
//#define DBG_WWATCH toggle_watch
|
||||||
|
//#define DBG_RWATCH toggle_rwatch
|
||||||
|
//#define DBG_AWATCH toggle_awatch
|
||||||
|
|
||||||
|
/* Size of hardware breakpoint. Required to correct PC. */
|
||||||
|
#define DBG_HWBREAK_SIZE 0
|
||||||
|
|
||||||
|
/* Define following macro if you need custom memory read/write routine.
|
||||||
|
Function should return non-zero on success, and zero on failure
|
||||||
|
(for example, write to ROM area).
|
||||||
|
Useful with overlays (bank switching).
|
||||||
|
Do not forget to define:
|
||||||
|
_ovly_table - overlay table
|
||||||
|
_novlys - number of items in _ovly_table
|
||||||
|
or
|
||||||
|
_ovly_region_table - overlay regions table
|
||||||
|
_novly_regions - number of items in _ovly_region_table
|
||||||
|
|
||||||
|
_ovly_debug_prepare - function is called before overlay mapping
|
||||||
|
_ovly_debug_event - function is called after overlay mapping
|
||||||
|
*/
|
||||||
|
//#define DBG_MEMCPY memcpy
|
||||||
|
|
||||||
|
/* define dedicated stack size if required */
|
||||||
|
//#define DBG_STACK_SIZE 256
|
||||||
|
|
||||||
|
/* max GDB packet size
|
||||||
|
should be much less that DBG_STACK_SIZE because it will be allocated on stack
|
||||||
|
*/
|
||||||
|
#define DBG_PACKET_SIZE 800
|
||||||
|
|
||||||
|
/* Uncomment if required to use trampoline when resuming operation.
|
||||||
|
Useful with dedicated stack when stack pointer do not point to the stack or
|
||||||
|
stack is not writable */
|
||||||
|
//#define DBG_USE_TRAMPOLINE
|
||||||
|
|
||||||
|
/* Uncomment following macro to enable debug printing to debugger console */
|
||||||
|
#define DBG_PRINT
|
||||||
|
|
||||||
|
#define DBG_NMI_EX EX_HWBREAK
|
||||||
|
#define DBG_INT_EX EX_SIGINT
|
||||||
|
|
||||||
|
/* Define following macro to statement, which will be exectuted after entering to
|
||||||
|
_gdb_stub_main function. Statement should include semicolon. */
|
||||||
|
#define DBG_ENTER if(_gdb_enter_func) { _gdb_enter_func(); };
|
||||||
|
|
||||||
|
/* Define following macro to instruction(s), which will be execute before return
|
||||||
|
control to the program. It is useful when gdb-stub is placed in one of overlays.
|
||||||
|
This procedure must not change any register. On top of stack before invocation
|
||||||
|
will be return address of the program. */
|
||||||
|
//#define DBG_RESUME jp _restore_bank
|
||||||
|
|
||||||
|
/* Define following macro to the string containing memory map definition XML.
|
||||||
|
GDB will use it to select proper breakpoint type (HW or SW). */
|
||||||
|
/*#define DBG_MEMORY_MAP "\
|
||||||
|
<memory-map>\
|
||||||
|
<memory type=\"rom\" start=\"0x0000\" length=\"0x4000\"/>\
|
||||||
|
<!-- <memory type=\"flash\" start=\"0x4000\" length=\"0x4000\">\
|
||||||
|
<property name=\"blocksize\">128</property>\
|
||||||
|
</memory> -->\
|
||||||
|
<memory type=\"ram\" start=\"0x8000\" length=\"0x8000\"/>\
|
||||||
|
</memory-map>\
|
||||||
|
"
|
||||||
|
*/
|
||||||
|
|
||||||
|
/* Define following macro to the string containing feature definition XML. */
|
||||||
|
#define DBG_FEATURE_STR "<target version=\"1.0\">"\
|
||||||
|
"<feature name=\"org.gnu.gdb.z80.cpu\">"\
|
||||||
|
"<reg name=\"af\" bitsize=\"16\" type=\"int\"/>"\
|
||||||
|
"<reg name=\"bc\" bitsize=\"16\" type=\"int\"/>"\
|
||||||
|
"<reg name=\"de\" bitsize=\"16\" type=\"int\"/>"\
|
||||||
|
"<reg name=\"hl\" bitsize=\"16\" type=\"int\"/>"\
|
||||||
|
"<reg name=\"sp\" bitsize=\"16\" type=\"data_ptr\"/>"\
|
||||||
|
"<reg name=\"pc\" bitsize=\"16\" type=\"code_ptr\"/>"\
|
||||||
|
"<reg name=\"ix\" bitsize=\"16\" type=\"int\"/>"\
|
||||||
|
"<reg name=\"iy\" bitsize=\"16\" type=\"int\"/>"\
|
||||||
|
"<reg name=\"af'\" bitsize=\"16\" type=\"int\"/>"\
|
||||||
|
"<reg name=\"bc'\" bitsize=\"16\" type=\"int\"/>"\
|
||||||
|
"<reg name=\"de'\" bitsize=\"16\" type=\"int\"/>"\
|
||||||
|
"<reg name=\"hl'\" bitsize=\"16\" type=\"int\"/>"\
|
||||||
|
"<reg name=\"ir\" bitsize=\"16\" type=\"int\"/>"\
|
||||||
|
"</feature>"\
|
||||||
|
"<architecture>z80</architecture>"\
|
||||||
|
"</target>"
|
||||||
|
|
||||||
|
#endif /* DBG_CONFIGURED */
|
||||||
|
/******************************************************************************\
|
||||||
|
Public Interface
|
||||||
|
\******************************************************************************/
|
||||||
|
|
||||||
|
#ifndef NULL
|
||||||
|
# define NULL ((void*)0)
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#define EX_SWBREAK 0 /* sw breakpoint */
|
||||||
|
#define EX_HWBREAK -1 /* hw breakpoint */
|
||||||
|
#define EX_WWATCH -2 /* memory write watch */
|
||||||
|
#define EX_RWATCH -3 /* memory read watch */
|
||||||
|
#define EX_AWATCH -4 /* memory access watch */
|
||||||
|
#define EX_SIGINT 2
|
||||||
|
#define EX_SIGTRAP 5
|
||||||
|
#define EX_SIGABRT 6
|
||||||
|
#define EX_SIGBUS 10
|
||||||
|
#define EX_SIGSEGV 11
|
||||||
|
/* or any standard *nix signal value */
|
||||||
|
|
||||||
|
#endif // __GDB_LIB_H__
|
||||||
|
|
||||||
|
/******************************************************************************\
|
||||||
|
IMPLEMENTATION
|
||||||
|
\******************************************************************************/
|
||||||
|
|
||||||
|
/* CPU state */
|
||||||
|
#ifdef __SDCC_ez80_adl
|
||||||
|
# define REG_SIZE 3
|
||||||
|
#else
|
||||||
|
# define REG_SIZE 2
|
||||||
|
#endif /* __SDCC_ez80_adl */
|
||||||
|
|
||||||
|
#define R_AF (0*REG_SIZE)
|
||||||
|
#define R_BC (1*REG_SIZE)
|
||||||
|
#define R_DE (2*REG_SIZE)
|
||||||
|
#define R_HL (3*REG_SIZE)
|
||||||
|
#define R_SP (4*REG_SIZE)
|
||||||
|
#define R_PC (5*REG_SIZE)
|
||||||
|
|
||||||
|
#ifndef __SDCC_gbz80
|
||||||
|
#define R_IX (6*REG_SIZE)
|
||||||
|
#define R_IY (7*REG_SIZE)
|
||||||
|
#define R_AF_ (8*REG_SIZE)
|
||||||
|
#define R_BC_ (9*REG_SIZE)
|
||||||
|
#define R_DE_ (10*REG_SIZE)
|
||||||
|
#define R_HL_ (11*REG_SIZE)
|
||||||
|
#define R_IR (12*REG_SIZE)
|
||||||
|
|
||||||
|
#ifdef __SDCC_ez80_adl
|
||||||
|
#define R_SPS (13*REG_SIZE)
|
||||||
|
#define NUMREGBYTES (14*REG_SIZE)
|
||||||
|
#else
|
||||||
|
#define NUMREGBYTES (13*REG_SIZE)
|
||||||
|
#endif /* __SDCC_ez80_adl */
|
||||||
|
#else
|
||||||
|
#define NUMREGBYTES (6*REG_SIZE)
|
||||||
|
#define FASTCALL
|
||||||
|
#endif /*__SDCC_gbz80 */
|
||||||
|
extern byte _gdb_state[NUMREGBYTES];
|
||||||
|
|
||||||
|
void _gdb_save_cpu_state (void);
|
||||||
|
void _gdb_rest_cpu_state (void);
|
||||||
|
void _gdb_stub_main (int sigval, int pc_adj);
|
||||||
|
|
||||||
|
/* dedicated stack */
|
||||||
|
#ifdef DBG_STACK_SIZE
|
||||||
|
|
||||||
|
#define LOAD_SP ld sp, __gdb_stack + DBG_STACK_SIZE
|
||||||
|
|
||||||
|
static char _gdb_stack[DBG_STACK_SIZE];
|
||||||
|
|
||||||
|
#else
|
||||||
|
|
||||||
|
#undef DBG_USE_TRAMPOLINE
|
||||||
|
#define LOAD_SP
|
||||||
|
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#ifdef DBG_HWBREAK
|
||||||
|
extern int (*_gdb_toggle_hwbreak)(int set, void *addr);
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#if defined(DBG_TOGGLESTEP)
|
||||||
|
extern int (*_gdb_toggle_step)(int set);
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#ifdef DBG_SWBREAK
|
||||||
|
extern int (*_gdb_toggle_swbreak)(int set, void *addr);
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#ifdef DBG_ENTER
|
||||||
|
extern void (*_gdb_enter_func)(void);
|
||||||
|
#endif
|
||||||
Loading…
Add table
Reference in a new issue