diff options
Diffstat (limited to 'arch/blackfin/kernel/kgdb.c')
| -rw-r--r-- | arch/blackfin/kernel/kgdb.c | 421 |
1 files changed, 421 insertions, 0 deletions
diff --git a/arch/blackfin/kernel/kgdb.c b/arch/blackfin/kernel/kgdb.c new file mode 100644 index 000000000000..a9c15515bfd7 --- /dev/null +++ b/arch/blackfin/kernel/kgdb.c @@ -0,0 +1,421 @@ +/* + * File: arch/blackfin/kernel/kgdb.c + * Based on: + * Author: Sonic Zhang + * + * Created: + * Description: + * + * Rev: $Id: kgdb_bfin_linux-2.6.x.patch 4934 2007-02-13 09:32:11Z sonicz $ + * + * Modified: + * Copyright 2005-2006 Analog Devices Inc. + * + * Bugs: Enter bugs at http://blackfin.uclinux.org/ + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see the file COPYING, or write + * to the Free Software Foundation, Inc., + * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <linux/string.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/smp.h> +#include <linux/spinlock.h> +#include <linux/delay.h> +#include <linux/ptrace.h> /* for linux pt_regs struct */ +#include <linux/kgdb.h> +#include <linux/console.h> +#include <linux/init.h> +#include <linux/debugger.h> +#include <linux/errno.h> +#include <linux/irq.h> +#include <asm/system.h> +#include <asm/traps.h> +#include <asm/blackfin.h> + +/* Put the error code here just in case the user cares. */ +int gdb_bf533errcode; +/* Likewise, the vector number here (since GDB only gets the signal + number through the usual means, and that's not very specific). */ +int gdb_bf533vector = -1; + +#if KGDB_MAX_NO_CPUS != 8 +#error change the definition of slavecpulocks +#endif + +void regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs) +{ + gdb_regs[BFIN_R0] = regs->r0; + gdb_regs[BFIN_R1] = regs->r1; + gdb_regs[BFIN_R2] = regs->r2; + gdb_regs[BFIN_R3] = regs->r3; + gdb_regs[BFIN_R4] = regs->r4; + gdb_regs[BFIN_R5] = regs->r5; + gdb_regs[BFIN_R6] = regs->r6; + gdb_regs[BFIN_R7] = regs->r7; + gdb_regs[BFIN_P0] = regs->p0; + gdb_regs[BFIN_P1] = regs->p1; + gdb_regs[BFIN_P2] = regs->p2; + gdb_regs[BFIN_P3] = regs->p3; + gdb_regs[BFIN_P4] = regs->p4; + gdb_regs[BFIN_P5] = regs->p5; + gdb_regs[BFIN_SP] = regs->reserved; + gdb_regs[BFIN_FP] = regs->fp; + gdb_regs[BFIN_I0] = regs->i0; + gdb_regs[BFIN_I1] = regs->i1; + gdb_regs[BFIN_I2] = regs->i2; + gdb_regs[BFIN_I3] = regs->i3; + gdb_regs[BFIN_M0] = regs->m0; + gdb_regs[BFIN_M1] = regs->m1; + gdb_regs[BFIN_M2] = regs->m2; + gdb_regs[BFIN_M3] = regs->m3; + gdb_regs[BFIN_B0] = regs->b0; + gdb_regs[BFIN_B1] = regs->b1; + gdb_regs[BFIN_B2] = regs->b2; + gdb_regs[BFIN_B3] = regs->b3; + gdb_regs[BFIN_L0] = regs->l0; + gdb_regs[BFIN_L1] = regs->l1; + gdb_regs[BFIN_L2] = regs->l2; + gdb_regs[BFIN_L3] = regs->l3; + gdb_regs[BFIN_A0_DOT_X] = regs->a0x; + gdb_regs[BFIN_A0_DOT_W] = regs->a0w; + gdb_regs[BFIN_A1_DOT_X] = regs->a1x; + gdb_regs[BFIN_A1_DOT_W] = regs->a1w; + gdb_regs[BFIN_ASTAT] = regs->astat; + gdb_regs[BFIN_RETS] = regs->rets; + gdb_regs[BFIN_LC0] = regs->lc0; + gdb_regs[BFIN_LT0] = regs->lt0; + gdb_regs[BFIN_LB0] = regs->lb0; + gdb_regs[BFIN_LC1] = regs->lc1; + gdb_regs[BFIN_LT1] = regs->lt1; + gdb_regs[BFIN_LB1] = regs->lb1; + gdb_regs[BFIN_CYCLES] = 0; + gdb_regs[BFIN_CYCLES2] = 0; + gdb_regs[BFIN_USP] = regs->usp; + gdb_regs[BFIN_SEQSTAT] = regs->seqstat; + gdb_regs[BFIN_SYSCFG] = regs->syscfg; + gdb_regs[BFIN_RETI] = regs->pc; + gdb_regs[BFIN_RETX] = regs->retx; + gdb_regs[BFIN_RETN] = regs->retn; + gdb_regs[BFIN_RETE] = regs->rete; + gdb_regs[BFIN_PC] = regs->pc; + gdb_regs[BFIN_CC] = 0; + gdb_regs[BFIN_EXTRA1] = 0; + gdb_regs[BFIN_EXTRA2] = 0; + gdb_regs[BFIN_EXTRA3] = 0; + gdb_regs[BFIN_IPEND] = regs->ipend; +} + +/* + * Extracts ebp, esp and eip values understandable by gdb from the values + * saved by switch_to. + * thread.esp points to ebp. flags and ebp are pushed in switch_to hence esp + * prior to entering switch_to is 8 greater then the value that is saved. + * If switch_to changes, change following code appropriately. + */ +void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p) +{ + gdb_regs[BFIN_SP] = p->thread.ksp; + gdb_regs[BFIN_PC] = p->thread.pc; + gdb_regs[BFIN_SEQSTAT] = p->thread.seqstat; +} + +void gdb_regs_to_regs(unsigned long *gdb_regs, struct pt_regs *regs) +{ + regs->r0 = gdb_regs[BFIN_R0]; + regs->r1 = gdb_regs[BFIN_R1]; + regs->r2 = gdb_regs[BFIN_R2]; + regs->r3 = gdb_regs[BFIN_R3]; + regs->r4 = gdb_regs[BFIN_R4]; + regs->r5 = gdb_regs[BFIN_R5]; + regs->r6 = gdb_regs[BFIN_R6]; + regs->r7 = gdb_regs[BFIN_R7]; + regs->p0 = gdb_regs[BFIN_P0]; + regs->p1 = gdb_regs[BFIN_P1]; + regs->p2 = gdb_regs[BFIN_P2]; + regs->p3 = gdb_regs[BFIN_P3]; + regs->p4 = gdb_regs[BFIN_P4]; + regs->p5 = gdb_regs[BFIN_P5]; + regs->fp = gdb_regs[BFIN_FP]; + regs->i0 = gdb_regs[BFIN_I0]; + regs->i1 = gdb_regs[BFIN_I1]; + regs->i2 = gdb_regs[BFIN_I2]; + regs->i3 = gdb_regs[BFIN_I3]; + regs->m0 = gdb_regs[BFIN_M0]; + regs->m1 = gdb_regs[BFIN_M1]; + regs->m2 = gdb_regs[BFIN_M2]; + regs->m3 = gdb_regs[BFIN_M3]; + regs->b0 = gdb_regs[BFIN_B0]; + regs->b1 = gdb_regs[BFIN_B1]; + regs->b2 = gdb_regs[BFIN_B2]; + regs->b3 = gdb_regs[BFIN_B3]; + regs->l0 = gdb_regs[BFIN_L0]; + regs->l1 = gdb_regs[BFIN_L1]; + regs->l2 = gdb_regs[BFIN_L2]; + regs->l3 = gdb_regs[BFIN_L3]; + regs->a0x = gdb_regs[BFIN_A0_DOT_X]; + regs->a0w = gdb_regs[BFIN_A0_DOT_W]; + regs->a1x = gdb_regs[BFIN_A1_DOT_X]; + regs->a1w = gdb_regs[BFIN_A1_DOT_W]; + regs->rets = gdb_regs[BFIN_RETS]; + regs->lc0 = gdb_regs[BFIN_LC0]; + regs->lt0 = gdb_regs[BFIN_LT0]; + regs->lb0 = gdb_regs[BFIN_LB0]; + regs->lc1 = gdb_regs[BFIN_LC1]; + regs->lt1 = gdb_regs[BFIN_LT1]; + regs->lb1 = gdb_regs[BFIN_LB1]; + regs->usp = gdb_regs[BFIN_USP]; + regs->syscfg = gdb_regs[BFIN_SYSCFG]; + regs->retx = gdb_regs[BFIN_PC]; + regs->retn = gdb_regs[BFIN_RETN]; + regs->rete = gdb_regs[BFIN_RETE]; + regs->pc = gdb_regs[BFIN_PC]; + +#if 0 /* can't change these */ + regs->astat = gdb_regs[BFIN_ASTAT]; + regs->seqstat = gdb_regs[BFIN_SEQSTAT]; + regs->ipend = gdb_regs[BFIN_IPEND]; +#endif +} + +struct hw_breakpoint { + unsigned int occupied:1; + unsigned int skip:1; + unsigned int enabled:1; + unsigned int type:1; + unsigned int dataacc:2; + unsigned short count; + unsigned int addr; +} breakinfo[HW_BREAKPOINT_NUM]; + +int kgdb_arch_init(void) +{ + kgdb_remove_all_hw_break(); + return 0; +} + +int kgdb_set_hw_break(unsigned long addr) +{ + int breakno; + for (breakno = 0; breakno < HW_BREAKPOINT_NUM; breakno++) + if (!breakinfo[breakno].occupied) { + breakinfo[breakno].occupied = 1; + breakinfo[breakno].enabled = 1; + breakinfo[breakno].type = 1; + breakinfo[breakno].addr = addr; + return 0; + } + + return -ENOSPC; +} + +int kgdb_remove_hw_break(unsigned long addr) +{ + int breakno; + for (breakno = 0; breakno < HW_BREAKPOINT_NUM; breakno++) + if (breakinfo[breakno].addr == addr) + memset(&(breakinfo[breakno]), 0, sizeof(struct hw_breakpoint)); + + return 0; +} + +void kgdb_remove_all_hw_break(void) +{ + memset(breakinfo, 0, sizeof(struct hw_breakpoint)*8); +} + +/* +void kgdb_show_info(void) +{ + printk(KERN_DEBUG "hwd: wpia0=0x%x, wpiacnt0=%d, wpiactl=0x%x, wpstat=0x%x\n", + bfin_read_WPIA0(), bfin_read_WPIACNT0(), + bfin_read_WPIACTL(), bfin_read_WPSTAT()); +} +*/ + +void kgdb_correct_hw_break(void) +{ + int breakno; + int correctit; + uint32_t wpdactl = bfin_read_WPDACTL(); + + correctit = 0; + for (breakno = 0; breakno < HW_BREAKPOINT_NUM; breakno++) { + if (breakinfo[breakno].type == 1) { + switch (breakno) { + case 0: + if (breakinfo[breakno].enabled && !(wpdactl & WPIAEN0)) { + correctit = 1; + wpdactl &= ~(WPIREN01|EMUSW0); + wpdactl |= WPIAEN0|WPICNTEN0; + bfin_write_WPIA0(breakinfo[breakno].addr); + bfin_write_WPIACNT0(breakinfo[breakno].skip); + } else if (!breakinfo[breakno].enabled && (wpdactl & WPIAEN0)) { + correctit = 1; + wpdactl &= ~WPIAEN0; + } + break; + + case 1: + if (breakinfo[breakno].enabled && !(wpdactl & WPIAEN1)) { + correctit = 1; + wpdactl &= ~(WPIREN01|EMUSW1); + wpdactl |= WPIAEN1|WPICNTEN1; + bfin_write_WPIA1(breakinfo[breakno].addr); + bfin_write_WPIACNT1(breakinfo[breakno].skip); + } else if (!breakinfo[breakno].enabled && (wpdactl & WPIAEN1)) { + correctit = 1; + wpdactl &= ~WPIAEN1; + } + break; + + case 2: + if (breakinfo[breakno].enabled && !(wpdactl & WPIAEN2)) { + correctit = 1; + wpdactl &= ~(WPIREN23|EMUSW2); + wpdactl |= WPIAEN2|WPICNTEN2; + bfin_write_WPIA2(breakinfo[breakno].addr); + bfin_write_WPIACNT2(breakinfo[breakno].skip); + } else if (!breakinfo[breakno].enabled && (wpdactl & WPIAEN2)) { + correctit = 1; + wpdactl &= ~WPIAEN2; + } + break; + + case 3: + if (breakinfo[breakno].enabled && !(wpdactl & WPIAEN3)) { + correctit = 1; + wpdactl &= ~(WPIREN23|EMUSW3); + wpdactl |= WPIAEN3|WPICNTEN3; + bfin_write_WPIA3(breakinfo[breakno].addr); + bfin_write_WPIACNT3(breakinfo[breakno].skip); + } else if (!breakinfo[breakno].enabled && (wpdactl & WPIAEN3)) { + correctit = 1; + wpdactl &= ~WPIAEN3; + } + break; + case 4: + if (breakinfo[breakno].enabled && !(wpdactl & WPIAEN4)) { + correctit = 1; + wpdactl &= ~(WPIREN45|EMUSW4); + wpdactl |= WPIAEN4|WPICNTEN4; + bfin_write_WPIA4(breakinfo[breakno].addr); + bfin_write_WPIACNT4(breakinfo[breakno].skip); + } else if (!breakinfo[breakno].enabled && (wpdactl & WPIAEN4)) { + correctit = 1; + wpdactl &= ~WPIAEN4; + } + break; + case 5: + if (breakinfo[breakno].enabled && !(wpdactl & WPIAEN5)) { + correctit = 1; + wpdactl &= ~(WPIREN45|EMUSW5); + wpdactl |= WPIAEN5|WPICNTEN5; + bfin_write_WPIA5(breakinfo[breakno].addr); + bfin_write_WPIACNT5(breakinfo[breakno].skip); + } else if (!breakinfo[breakno].enabled && (wpdactl & WPIAEN5)) { + correctit = 1; + wpdactl &= ~WPIAEN5; + } + break; + } + } + } + if (correctit) { + wpdactl &= ~WPAND; + wpdactl |= WPPWR; + /*printk("correct_hw_break: wpdactl=0x%x\n", wpdactl);*/ + bfin_write_WPDACTL(wpdactl); + CSYNC(); + /*kgdb_show_info();*/ + } +} + +void kgdb_disable_hw_debug(struct pt_regs *regs) +{ + /* Disable hardware debugging while we are in kgdb */ + bfin_write_WPIACTL(bfin_read_WPIACTL() & ~0x1); + CSYNC(); +} + +void kgdb_post_master_code(struct pt_regs *regs, int eVector, int err_code) +{ + /* Master processor is completely in the debugger */ + gdb_bf533vector = eVector; + gdb_bf533errcode = err_code; +} + +int kgdb_arch_handle_exception(int exceptionVector, int signo, + int err_code, char *remcom_in_buffer, + char *remcom_out_buffer, + struct pt_regs *linux_regs) +{ + long addr; + long breakno; + char *ptr; + int newPC; + int wp_status; + + switch (remcom_in_buffer[0]) { + case 'c': + case 's': + if (kgdb_contthread && kgdb_contthread != current) { + strcpy(remcom_out_buffer, "E00"); + break; + } + + kgdb_contthread = NULL; + + /* try to read optional parameter, pc unchanged if no parm */ + ptr = &remcom_in_buffer[1]; + if (kgdb_hex2long(&ptr, &addr)) { + linux_regs->retx = addr; + } + newPC = linux_regs->retx; + + /* clear the trace bit */ + linux_regs->syscfg &= 0xfffffffe; + + /* set the trace bit if we're stepping */ + if (remcom_in_buffer[0] == 's') { + linux_regs->syscfg |= 0x1; + debugger_step = 1; + } + + wp_status = bfin_read_WPSTAT(); + CSYNC(); + + if (exceptionVector == VEC_WATCH) { + for (breakno = 0; breakno < 6; ++breakno) { + if (wp_status & (1 << breakno)) { + breakinfo->skip = 1; + break; + } + } + } + kgdb_correct_hw_break(); + + bfin_write_WPSTAT(0); + + return 0; + } /* switch */ + return -1; /* this means that we do not want to exit from the handler */ +} + +struct kgdb_arch arch_kgdb_ops = { + .gdb_bpt_instr = {0xa1}, + .flags = KGDB_HW_BREAKPOINT, +}; |