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172 lines
3.8 KiB
172 lines
3.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* kgdb.c: KGDB support for 32-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/sched.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 <asm/cacheflush.h> |
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#include "kernel.h" |
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#include "entry.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_window32 *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_window32 *) regs->u_regs[UREG_FP]; |
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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_F31; i++) |
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gdb_regs[i] = 0; |
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gdb_regs[GDB_Y] = regs->y; |
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gdb_regs[GDB_PSR] = regs->psr; |
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gdb_regs[GDB_WIM] = 0; |
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gdb_regs[GDB_TBR] = (unsigned long) &trapbase; |
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gdb_regs[GDB_PC] = regs->pc; |
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gdb_regs[GDB_NPC] = regs->npc; |
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gdb_regs[GDB_FSR] = 0; |
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gdb_regs[GDB_CSR] = 0; |
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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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struct reg_window32 *win; |
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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] = 0; |
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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_window32 *) t->ksp; |
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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_F31; i++) |
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gdb_regs[i] = 0; |
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gdb_regs[GDB_Y] = 0; |
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gdb_regs[GDB_PSR] = t->kpsr; |
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gdb_regs[GDB_WIM] = t->kwim; |
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gdb_regs[GDB_TBR] = (unsigned long) &trapbase; |
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gdb_regs[GDB_PC] = t->kpc; |
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gdb_regs[GDB_NPC] = t->kpc + 4; |
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gdb_regs[GDB_FSR] = 0; |
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gdb_regs[GDB_CSR] = 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_window32 *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 PSR 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->psr != gdb_regs[GDB_PSR]) { |
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unsigned long cwp = regs->psr & PSR_CWP; |
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regs->psr = (gdb_regs[GDB_PSR] & ~PSR_CWP) | cwp; |
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} |
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regs->pc = gdb_regs[GDB_PC]; |
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regs->npc = gdb_regs[GDB_NPC]; |
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regs->y = gdb_regs[GDB_Y]; |
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win = (struct reg_window32 *) regs->u_regs[UREG_FP]; |
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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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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->pc = addr; |
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linux_regs->npc = 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->pc == (unsigned long) arch_kgdb_breakpoint) { |
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linux_regs->pc = linux_regs->npc; |
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linux_regs->npc += 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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unsigned long flags; |
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if (user_mode(regs)) { |
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do_hw_interrupt(regs, trap_level); |
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return; |
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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(trap_level, SIGTRAP, 0, regs); |
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local_irq_restore(flags); |
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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->pc = ip; |
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regs->npc = regs->pc + 4; |
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} |
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const struct kgdb_arch arch_kgdb_ops = { |
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/* Breakpoint instruction: ta 0x7d */ |
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.gdb_bpt_instr = { 0x91, 0xd0, 0x20, 0x7d }, |
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};
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