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// SPDX-License-Identifier: GPL-2.0
/* kgdb.c: KGDB support for 32-bit sparc.
*
* Copyright (C) 2008 David S. Miller <davem@davemloft.net>
*/
#include <linux/kgdb.h>
#include <linux/kdebug.h>
#include <linux/sched.h>
#include <asm/kdebug.h>
#include <asm/ptrace.h>
#include <asm/irq.h>
#include <asm/cacheflush.h>
#include "kernel.h"
#include "entry.h"
void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
{
struct reg_window32 *win;
int i;
gdb_regs[GDB_G0] = 0;
for (i = 0; i < 15; i++)
gdb_regs[GDB_G1 + i] = regs->u_regs[UREG_G1 + i];
win = (struct reg_window32 *) regs->u_regs[UREG_FP];
for (i = 0; i < 8; i++)
gdb_regs[GDB_L0 + i] = win->locals[i];
for (i = 0; i < 8; i++)
gdb_regs[GDB_I0 + i] = win->ins[i];
for (i = GDB_F0; i <= GDB_F31; i++)
gdb_regs[i] = 0;
gdb_regs[GDB_Y] = regs->y;
gdb_regs[GDB_PSR] = regs->psr;
gdb_regs[GDB_WIM] = 0;
gdb_regs[GDB_TBR] = (unsigned long) &trapbase[0];
gdb_regs[GDB_PC] = regs->pc;
gdb_regs[GDB_NPC] = regs->npc;
gdb_regs[GDB_FSR] = 0;
gdb_regs[GDB_CSR] = 0;
}
void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
{
struct thread_info *t = task_thread_info(p);
struct reg_window32 *win;
int i;
for (i = GDB_G0; i < GDB_G6; i++)
gdb_regs[i] = 0;
gdb_regs[GDB_G6] = (unsigned long) t;
gdb_regs[GDB_G7] = 0;
for (i = GDB_O0; i < GDB_SP; i++)
gdb_regs[i] = 0;
gdb_regs[GDB_SP] = t->ksp;
gdb_regs[GDB_O7] = 0;
win = (struct reg_window32 *) t->ksp;
for (i = 0; i < 8; i++)
gdb_regs[GDB_L0 + i] = win->locals[i];
for (i = 0; i < 8; i++)
gdb_regs[GDB_I0 + i] = win->ins[i];
for (i = GDB_F0; i <= GDB_F31; i++)
gdb_regs[i] = 0;
gdb_regs[GDB_Y] = 0;
gdb_regs[GDB_PSR] = t->kpsr;
gdb_regs[GDB_WIM] = t->kwim;
gdb_regs[GDB_TBR] = (unsigned long) &trapbase[0];
gdb_regs[GDB_PC] = t->kpc;
gdb_regs[GDB_NPC] = t->kpc + 4;
gdb_regs[GDB_FSR] = 0;
gdb_regs[GDB_CSR] = 0;
}
void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
{
struct reg_window32 *win;
int i;
for (i = 0; i < 15; i++)
regs->u_regs[UREG_G1 + i] = gdb_regs[GDB_G1 + i];
/* If the PSR register is changing, we have to preserve
* the CWP field, otherwise window save/restore explodes.
*/
if (regs->psr != gdb_regs[GDB_PSR]) {
unsigned long cwp = regs->psr & PSR_CWP;
regs->psr = (gdb_regs[GDB_PSR] & ~PSR_CWP) | cwp;
}
regs->pc = gdb_regs[GDB_PC];
regs->npc = gdb_regs[GDB_NPC];
regs->y = gdb_regs[GDB_Y];
win = (struct reg_window32 *) regs->u_regs[UREG_FP];
for (i = 0; i < 8; i++)
win->locals[i] = gdb_regs[GDB_L0 + i];
for (i = 0; i < 8; i++)
win->ins[i] = gdb_regs[GDB_I0 + i];
}
int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
char *remcomInBuffer, char *remcomOutBuffer,
struct pt_regs *linux_regs)
{
unsigned long addr;
char *ptr;
switch (remcomInBuffer[0]) {
case 'c':
/* try to read optional parameter, pc unchanged if no parm */
ptr = &remcomInBuffer[1];
if (kgdb_hex2long(&ptr, &addr)) {
linux_regs->pc = addr;
linux_regs->npc = addr + 4;
}
fallthrough;
case 'D':
case 'k':
if (linux_regs->pc == (unsigned long) arch_kgdb_breakpoint) {
linux_regs->pc = linux_regs->npc;
linux_regs->npc += 4;
}
return 0;
}
return -1;
}
asmlinkage void kgdb_trap(unsigned long trap_level, struct pt_regs *regs)
{
unsigned long flags;
if (user_mode(regs)) {
do_hw_interrupt(regs, trap_level);
return;
}
flushw_all();
local_irq_save(flags);
kgdb_handle_exception(trap_level, SIGTRAP, 0, regs);
local_irq_restore(flags);
}
int kgdb_arch_init(void)
{
return 0;
}
void kgdb_arch_exit(void)
{
}
void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)
{
regs->pc = ip;
regs->npc = regs->pc + 4;
}
const struct kgdb_arch arch_kgdb_ops = {
/* Breakpoint instruction: ta 0x7d */
.gdb_bpt_instr = { 0x91, 0xd0, 0x20, 0x7d },
};
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