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-rw-r--r--x86/gdbstub_sys.c350
1 files changed, 0 insertions, 350 deletions
diff --git a/x86/gdbstub_sys.c b/x86/gdbstub_sys.c
deleted file mode 100644
index a73bc52..0000000
--- a/x86/gdbstub_sys.c
+++ /dev/null
@@ -1,350 +0,0 @@
-/*
- * Copyright (c) 2016-2019 Matt Borgerson
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-#include "gdbstub.h"
-
-#ifdef __STRICT_ANSI__
-#define asm __asm__
-#endif
-
-#define SERIAL_COM1 0x3f8
-#define SERIAL_COM2 0x2f8
-#define SERIAL_PORT SERIAL_COM1
-
-#define NUM_IDT_ENTRIES 32
-
-/*****************************************************************************
- * BSS Data
- ****************************************************************************/
-
-static struct dbg_idt_gate dbg_idt_gates[NUM_IDT_ENTRIES];
-static struct dbg_state dbg_state;
-
-/*****************************************************************************
- * Misc. Functions
- ****************************************************************************/
-
-void *dbg_sys_memset(void *ptr, int data, size_t len)
-{
- char *p = ptr;
-
- while (len--) {
- *p++ = (char)data;
- }
-
- return ptr;
-}
-
-/*
- * Get current code segment (CS register).
- */
-uint32_t dbg_get_cs(void)
-{
- uint32_t cs;
-
- asm volatile (
- "push %%cs;"
- "pop %%eax;"
- /* Outputs */ : "=a" (cs)
- /* Inputs */ : /* None */
- /* Clobbers */ : /* None */
- );
-
- return cs;
-}
-
-/*****************************************************************************
- * Interrupt Management Functions
- ****************************************************************************/
-
-/*
- * Initialize idt_gates with the interrupt handlers.
- */
-int dbg_init_gates(void)
-{
- size_t i;
- uint16_t cs;
-
- cs = dbg_get_cs();
- for (i = 0; i < NUM_IDT_ENTRIES; i++) {
- dbg_idt_gates[i].flags = 0x8E00;
- dbg_idt_gates[i].segment = cs;
- dbg_idt_gates[i].offset_low =
- ((uint32_t)dbg_int_handlers[i] ) & 0xffff;
- dbg_idt_gates[i].offset_high =
- ((uint32_t)dbg_int_handlers[i] >> 16) & 0xffff;
- }
-
- return 0;
-}
-
-/*
- * Load a new IDT.
- */
-int dbg_load_idt(struct dbg_idtr *idtr)
-{
- asm volatile (
- "lidt %0"
- /* Outputs */ : /* None */
- /* Inputs */ : "m" (*idtr)
- /* Clobbers */ : /* None */
- );
-
- return 0;
-}
-
-/*
- * Get current IDT.
- */
-int dbg_store_idt(struct dbg_idtr *idtr)
-{
- asm volatile (
- "sidt %0"
- /* Outputs */ : "=m" (*idtr)
- /* Inputs */ : /* None */
- /* Clobbers */ : /* None */
- );
-
- return 0;
-}
-
-/*
- * Hook a vector of the current IDT.
- */
-int dbg_hook_idt(uint8_t vector, const void *function)
-{
- struct dbg_idtr idtr;
- struct dbg_idt_gate *gates;
-
- dbg_store_idt(&idtr);
- gates = (struct dbg_idt_gate *)idtr.offset;
- gates[vector].flags = 0x8E00;
- gates[vector].segment = dbg_get_cs();
- gates[vector].offset_low = (((uint32_t)function) ) & 0xffff;
- gates[vector].offset_high = (((uint32_t)function) >> 16) & 0xffff;
-
- return 0;
-}
-
-/*
- * Initialize IDT gates and load the new IDT.
- */
-int dbg_init_idt(void)
-{
- struct dbg_idtr idtr;
-
- dbg_init_gates();
- idtr.len = sizeof(dbg_idt_gates)-1;
- idtr.offset = (uint32_t)dbg_idt_gates;
- dbg_load_idt(&idtr);
-
- return 0;
-}
-
-/*
- * Common interrupt handler routine.
- */
-void dbg_int_handler(struct dbg_interrupt_state *istate)
-{
- dbg_interrupt(istate);
-}
-
-/*
- * Debug interrupt handler.
- */
-void dbg_interrupt(struct dbg_interrupt_state *istate)
-{
- dbg_sys_memset(&dbg_state.registers, 0, sizeof(dbg_state.registers));
-
- /* Translate vector to signal */
- switch (istate->vector) {
- case 1: dbg_state.signum = 5; break;
- case 3: dbg_state.signum = 5; break;
- default: dbg_state.signum = 7;
- }
-
- /* Load Registers */
- dbg_state.registers[DBG_CPU_I386_REG_EAX] = istate->eax;
- dbg_state.registers[DBG_CPU_I386_REG_ECX] = istate->ecx;
- dbg_state.registers[DBG_CPU_I386_REG_EDX] = istate->edx;
- dbg_state.registers[DBG_CPU_I386_REG_EBX] = istate->ebx;
- dbg_state.registers[DBG_CPU_I386_REG_ESP] = istate->esp;
- dbg_state.registers[DBG_CPU_I386_REG_EBP] = istate->ebp;
- dbg_state.registers[DBG_CPU_I386_REG_ESI] = istate->esi;
- dbg_state.registers[DBG_CPU_I386_REG_EDI] = istate->edi;
- dbg_state.registers[DBG_CPU_I386_REG_PC] = istate->eip;
- dbg_state.registers[DBG_CPU_I386_REG_CS] = istate->cs;
- dbg_state.registers[DBG_CPU_I386_REG_PS] = istate->eflags;
- dbg_state.registers[DBG_CPU_I386_REG_SS] = istate->ss;
- dbg_state.registers[DBG_CPU_I386_REG_DS] = istate->ds;
- dbg_state.registers[DBG_CPU_I386_REG_ES] = istate->es;
- dbg_state.registers[DBG_CPU_I386_REG_FS] = istate->fs;
- dbg_state.registers[DBG_CPU_I386_REG_GS] = istate->gs;
-
- dbg_main(&dbg_state);
-
- /* Restore Registers */
- istate->eax = dbg_state.registers[DBG_CPU_I386_REG_EAX];
- istate->ecx = dbg_state.registers[DBG_CPU_I386_REG_ECX];
- istate->edx = dbg_state.registers[DBG_CPU_I386_REG_EDX];
- istate->ebx = dbg_state.registers[DBG_CPU_I386_REG_EBX];
- istate->esp = dbg_state.registers[DBG_CPU_I386_REG_ESP];
- istate->ebp = dbg_state.registers[DBG_CPU_I386_REG_EBP];
- istate->esi = dbg_state.registers[DBG_CPU_I386_REG_ESI];
- istate->edi = dbg_state.registers[DBG_CPU_I386_REG_EDI];
- istate->eip = dbg_state.registers[DBG_CPU_I386_REG_PC];
- istate->cs = dbg_state.registers[DBG_CPU_I386_REG_CS];
- istate->eflags = dbg_state.registers[DBG_CPU_I386_REG_PS];
- istate->ss = dbg_state.registers[DBG_CPU_I386_REG_SS];
- istate->ds = dbg_state.registers[DBG_CPU_I386_REG_DS];
- istate->es = dbg_state.registers[DBG_CPU_I386_REG_ES];
- istate->fs = dbg_state.registers[DBG_CPU_I386_REG_FS];
- istate->gs = dbg_state.registers[DBG_CPU_I386_REG_GS];
-}
-
-/*****************************************************************************
- * I/O Functions
- ****************************************************************************/
-
-/*
- * Write to I/O port.
- */
-void dbg_io_write_8(uint16_t port, uint8_t val)
-{
- asm volatile (
- "outb %%al, %%dx;"
- /* Outputs */ : /* None */
- /* Inputs */ : "a" (val), "d" (port)
- /* Clobbers */ : /* None */
- );
-}
-
-/*
- * Read from I/O port.
- */
-uint8_t dbg_io_read_8(uint16_t port)
-{
- uint8_t val;
-
- asm volatile (
- "inb %%dx, %%al;"
- /* Outputs */ : "=a" (val)
- /* Inputs */ : "d" (port)
- /* Clobbers */ : /* None */
- );
-
- return val;
-}
-
-/*****************************************************************************
- * NS16550 Serial Port (IO)
- ****************************************************************************/
-
-#define SERIAL_THR 0
-#define SERIAL_RBR 0
-#define SERIAL_LSR 5
-
-int dbg_serial_getc(void)
-{
- /* Wait for data */
- while ((dbg_io_read_8(SERIAL_PORT + SERIAL_LSR) & 1) == 0);
- return dbg_io_read_8(SERIAL_PORT + SERIAL_RBR);
-}
-
-int dbg_serial_putchar(int ch)
-{
- /* Wait for THRE (bit 5) to be high */
- while ((dbg_io_read_8(SERIAL_PORT + SERIAL_LSR) & (1<<5)) == 0);
- dbg_io_write_8(SERIAL_PORT + SERIAL_THR, ch);
- return ch;
-}
-
-/*****************************************************************************
- * Debugging System Functions
- ****************************************************************************/
-
-/*
- * Write one character to the debugging stream.
- */
-int dbg_sys_putchar(int ch)
-{
- return dbg_serial_putchar(ch);
-}
-
-/*
- * Read one character from the debugging stream.
- */
-int dbg_sys_getc(void)
-{
- return dbg_serial_getc() & 0xff;
-}
-
-/*
- * Read one byte from memory.
- */
-int dbg_sys_mem_readb(address addr, char *val)
-{
- *val = *(volatile char *)addr;
- return 0;
-}
-
-/*
- * Write one byte to memory.
- */
-int dbg_sys_mem_writeb(address addr, char val)
-{
- *(volatile char *)addr = val;
- return 0;
-}
-
-/*
- * Continue program execution.
- */
-int dbg_sys_continue(void)
-{
- dbg_state.registers[DBG_CPU_I386_REG_PS] &= ~(1<<8);
- return 0;
-}
-
-/*
- * Single step the next instruction.
- */
-int dbg_sys_step(void)
-{
- dbg_state.registers[DBG_CPU_I386_REG_PS] |= 1<<8;
- return 0;
-}
-
-/*
- * Debugger init function.
- *
- * Hooks the IDT to enable debugging.
- */
-void dbg_start(void)
-{
- /* Hook current IDT. */
- dbg_hook_idt(1, dbg_int_handlers[1]);
- dbg_hook_idt(3, dbg_int_handlers[3]);
-
- /* Interrupt to start debugging. */
- asm volatile ("int3");
-}
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