diff options
Diffstat (limited to 'arch/sparc/kernel/kgdb_32.c')
| -rw-r--r-- | arch/sparc/kernel/kgdb_32.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/arch/sparc/kernel/kgdb_32.c b/arch/sparc/kernel/kgdb_32.c new file mode 100644 index 0000000000..58ad3f7de1 --- /dev/null +++ b/arch/sparc/kernel/kgdb_32.c @@ -0,0 +1,172 @@ +// 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; + 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; + 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 }, +}; |