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152 lines
4.0 KiB
152 lines
4.0 KiB
/* |
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* Microblaze KGDB support |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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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/irq.h> |
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#include <linux/io.h> |
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#include <asm/cacheflush.h> |
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#include <asm/asm-offsets.h> |
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#include <asm/kgdb.h> |
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#include <asm/pvr.h> |
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#define GDB_REG 0 |
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#define GDB_PC 32 |
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#define GDB_MSR 33 |
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#define GDB_EAR 34 |
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#define GDB_ESR 35 |
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#define GDB_FSR 36 |
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#define GDB_BTR 37 |
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#define GDB_PVR 38 |
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#define GDB_REDR 50 |
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#define GDB_RPID 51 |
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#define GDB_RZPR 52 |
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#define GDB_RTLBX 53 |
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#define GDB_RTLBSX 54 /* mfs can't read it */ |
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#define GDB_RTLBLO 55 |
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#define GDB_RTLBHI 56 |
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/* keep pvr separately because it is unchangeble */ |
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static struct pvr_s pvr; |
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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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unsigned int i; |
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unsigned long *pt_regb = (unsigned long *)regs; |
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int temp; |
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/* registers r0 - r31, pc, msr, ear, esr, fsr + do not save pt_mode */ |
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for (i = 0; i < (sizeof(struct pt_regs) / 4) - 1; i++) |
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gdb_regs[i] = pt_regb[i]; |
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/* Branch target register can't be changed */ |
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__asm__ __volatile__ ("mfs %0, rbtr;" : "=r"(temp) : ); |
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gdb_regs[GDB_BTR] = temp; |
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/* pvr part - we have 11 pvr regs */ |
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for (i = 0; i < sizeof(struct pvr_s)/4; i++) |
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gdb_regs[GDB_PVR + i] = pvr.pvr[i]; |
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/* read special registers - can't be changed */ |
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__asm__ __volatile__ ("mfs %0, redr;" : "=r"(temp) : ); |
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gdb_regs[GDB_REDR] = temp; |
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__asm__ __volatile__ ("mfs %0, rpid;" : "=r"(temp) : ); |
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gdb_regs[GDB_RPID] = temp; |
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__asm__ __volatile__ ("mfs %0, rzpr;" : "=r"(temp) : ); |
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gdb_regs[GDB_RZPR] = temp; |
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__asm__ __volatile__ ("mfs %0, rtlbx;" : "=r"(temp) : ); |
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gdb_regs[GDB_RTLBX] = temp; |
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__asm__ __volatile__ ("mfs %0, rtlblo;" : "=r"(temp) : ); |
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gdb_regs[GDB_RTLBLO] = temp; |
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__asm__ __volatile__ ("mfs %0, rtlbhi;" : "=r"(temp) : ); |
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gdb_regs[GDB_RTLBHI] = temp; |
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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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unsigned int i; |
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unsigned long *pt_regb = (unsigned long *)regs; |
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/* pt_regs and gdb_regs have the same 37 values. |
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* The rest of gdb_regs are unused and can't be changed. |
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* r0 register value can't be changed too. */ |
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for (i = 1; i < (sizeof(struct pt_regs) / 4) - 1; i++) |
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pt_regb[i] = gdb_regs[i]; |
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} |
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asmlinkage void microblaze_kgdb_break(struct pt_regs *regs) |
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{ |
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if (kgdb_handle_exception(1, SIGTRAP, 0, regs) != 0) |
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return; |
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/* Jump over the first arch_kgdb_breakpoint which is barrier to |
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* get kgdb work. The same solution is used for powerpc */ |
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if (*(u32 *) (regs->pc) == *(u32 *) (&arch_kgdb_ops.gdb_bpt_instr)) |
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regs->pc += BREAK_INSTR_SIZE; |
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} |
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/* untested */ |
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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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unsigned int i; |
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unsigned long *pt_regb = (unsigned long *)(p->thread.regs); |
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/* registers r0 - r31, pc, msr, ear, esr, fsr + do not save pt_mode */ |
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for (i = 0; i < (sizeof(struct pt_regs) / 4) - 1; i++) |
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gdb_regs[i] = pt_regb[i]; |
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/* pvr part - we have 11 pvr regs */ |
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for (i = 0; i < sizeof(struct pvr_s)/4; i++) |
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gdb_regs[GDB_PVR + i] = pvr.pvr[i]; |
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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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} |
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int kgdb_arch_handle_exception(int vector, int signo, int err_code, |
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char *remcom_in_buffer, char *remcom_out_buffer, |
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struct pt_regs *regs) |
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{ |
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char *ptr; |
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unsigned long address; |
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switch (remcom_in_buffer[0]) { |
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case 'c': |
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/* handle the optional parameter */ |
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ptr = &remcom_in_buffer[1]; |
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if (kgdb_hex2long(&ptr, &address)) |
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regs->pc = address; |
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return 0; |
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} |
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return -1; /* this means that we do not want to exit from the handler */ |
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} |
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int kgdb_arch_init(void) |
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{ |
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get_pvr(&pvr); /* Fill PVR structure */ |
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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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/* Nothing to do */ |
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} |
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/* |
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* Global data |
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*/ |
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const struct kgdb_arch arch_kgdb_ops = { |
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#ifdef __MICROBLAZEEL__ |
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.gdb_bpt_instr = {0x18, 0x00, 0x0c, 0xba}, /* brki r16, 0x18 */ |
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#else |
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.gdb_bpt_instr = {0xba, 0x0c, 0x00, 0x18}, /* brki r16, 0x18 */ |
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#endif |
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};
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