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201 lines
4.5 KiB
201 lines
4.5 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* kgdb.c: KGDB support for 64-bit sparc. |
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* |
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* Copyright (C) 2008 David S. Miller <[email protected]> |
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*/ |
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#include <linux/kgdb.h> |
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#include <linux/kdebug.h> |
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#include <linux/ftrace.h> |
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#include <linux/context_tracking.h> |
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#include <asm/cacheflush.h> |
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#include <asm/kdebug.h> |
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#include <asm/ptrace.h> |
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#include <asm/irq.h> |
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#include "kernel.h" |
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void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs) |
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{ |
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struct reg_window *win; |
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int i; |
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gdb_regs[GDB_G0] = 0; |
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for (i = 0; i < 15; i++) |
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gdb_regs[GDB_G1 + i] = regs->u_regs[UREG_G1 + i]; |
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win = (struct reg_window *) (regs->u_regs[UREG_FP] + STACK_BIAS); |
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for (i = 0; i < 8; i++) |
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gdb_regs[GDB_L0 + i] = win->locals[i]; |
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for (i = 0; i < 8; i++) |
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gdb_regs[GDB_I0 + i] = win->ins[i]; |
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for (i = GDB_F0; i <= GDB_F62; i++) |
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gdb_regs[i] = 0; |
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gdb_regs[GDB_PC] = regs->tpc; |
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gdb_regs[GDB_NPC] = regs->tnpc; |
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gdb_regs[GDB_STATE] = regs->tstate; |
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gdb_regs[GDB_FSR] = 0; |
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gdb_regs[GDB_FPRS] = 0; |
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gdb_regs[GDB_Y] = regs->y; |
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} |
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void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p) |
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{ |
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struct thread_info *t = task_thread_info(p); |
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extern unsigned int switch_to_pc; |
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extern unsigned int ret_from_fork; |
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struct reg_window *win; |
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unsigned long pc, cwp; |
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int i; |
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for (i = GDB_G0; i < GDB_G6; i++) |
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gdb_regs[i] = 0; |
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gdb_regs[GDB_G6] = (unsigned long) t; |
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gdb_regs[GDB_G7] = (unsigned long) p; |
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for (i = GDB_O0; i < GDB_SP; i++) |
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gdb_regs[i] = 0; |
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gdb_regs[GDB_SP] = t->ksp; |
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gdb_regs[GDB_O7] = 0; |
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win = (struct reg_window *) (t->ksp + STACK_BIAS); |
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for (i = 0; i < 8; i++) |
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gdb_regs[GDB_L0 + i] = win->locals[i]; |
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for (i = 0; i < 8; i++) |
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gdb_regs[GDB_I0 + i] = win->ins[i]; |
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for (i = GDB_F0; i <= GDB_F62; i++) |
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gdb_regs[i] = 0; |
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if (t->new_child) |
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pc = (unsigned long) &ret_from_fork; |
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else |
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pc = (unsigned long) &switch_to_pc; |
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gdb_regs[GDB_PC] = pc; |
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gdb_regs[GDB_NPC] = pc + 4; |
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cwp = __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP]; |
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gdb_regs[GDB_STATE] = (TSTATE_PRIV | TSTATE_IE | cwp); |
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gdb_regs[GDB_FSR] = 0; |
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gdb_regs[GDB_FPRS] = 0; |
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gdb_regs[GDB_Y] = 0; |
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} |
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void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs) |
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{ |
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struct reg_window *win; |
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int i; |
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for (i = 0; i < 15; i++) |
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regs->u_regs[UREG_G1 + i] = gdb_regs[GDB_G1 + i]; |
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/* If the TSTATE register is changing, we have to preserve |
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* the CWP field, otherwise window save/restore explodes. |
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*/ |
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if (regs->tstate != gdb_regs[GDB_STATE]) { |
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unsigned long cwp = regs->tstate & TSTATE_CWP; |
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regs->tstate = (gdb_regs[GDB_STATE] & ~TSTATE_CWP) | cwp; |
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} |
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regs->tpc = gdb_regs[GDB_PC]; |
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regs->tnpc = gdb_regs[GDB_NPC]; |
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regs->y = gdb_regs[GDB_Y]; |
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win = (struct reg_window *) (regs->u_regs[UREG_FP] + STACK_BIAS); |
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for (i = 0; i < 8; i++) |
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win->locals[i] = gdb_regs[GDB_L0 + i]; |
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for (i = 0; i < 8; i++) |
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win->ins[i] = gdb_regs[GDB_I0 + i]; |
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} |
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#ifdef CONFIG_SMP |
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void __irq_entry smp_kgdb_capture_client(int irq, struct pt_regs *regs) |
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{ |
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unsigned long flags; |
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__asm__ __volatile__("rdpr %%pstate, %0\n\t" |
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"wrpr %0, %1, %%pstate" |
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: "=r" (flags) |
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: "i" (PSTATE_IE)); |
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flushw_all(); |
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if (atomic_read(&kgdb_active) != -1) |
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kgdb_nmicallback(raw_smp_processor_id(), regs); |
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__asm__ __volatile__("wrpr %0, 0, %%pstate" |
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: : "r" (flags)); |
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} |
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#endif |
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int kgdb_arch_handle_exception(int e_vector, int signo, int err_code, |
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char *remcomInBuffer, char *remcomOutBuffer, |
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struct pt_regs *linux_regs) |
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{ |
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unsigned long addr; |
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char *ptr; |
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switch (remcomInBuffer[0]) { |
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case 'c': |
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/* try to read optional parameter, pc unchanged if no parm */ |
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ptr = &remcomInBuffer[1]; |
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if (kgdb_hex2long(&ptr, &addr)) { |
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linux_regs->tpc = addr; |
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linux_regs->tnpc = addr + 4; |
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} |
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fallthrough; |
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case 'D': |
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case 'k': |
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if (linux_regs->tpc == (unsigned long) arch_kgdb_breakpoint) { |
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linux_regs->tpc = linux_regs->tnpc; |
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linux_regs->tnpc += 4; |
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} |
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return 0; |
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} |
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return -1; |
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} |
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asmlinkage void kgdb_trap(unsigned long trap_level, struct pt_regs *regs) |
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{ |
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enum ctx_state prev_state = exception_enter(); |
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unsigned long flags; |
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if (user_mode(regs)) { |
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bad_trap(regs, trap_level); |
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goto out; |
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} |
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flushw_all(); |
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local_irq_save(flags); |
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kgdb_handle_exception(0x172, SIGTRAP, 0, regs); |
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local_irq_restore(flags); |
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out: |
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exception_exit(prev_state); |
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} |
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int kgdb_arch_init(void) |
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{ |
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return 0; |
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} |
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void kgdb_arch_exit(void) |
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{ |
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} |
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void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip) |
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{ |
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regs->tpc = ip; |
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regs->tnpc = regs->tpc + 4; |
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} |
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const struct kgdb_arch arch_kgdb_ops = { |
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/* Breakpoint instruction: ta 0x72 */ |
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.gdb_bpt_instr = { 0x91, 0xd0, 0x20, 0x72 }, |
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};
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