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-rw-r--r--arch/microblaze/kernel/kgdb.c152
1 files changed, 152 insertions, 0 deletions
diff --git a/arch/microblaze/kernel/kgdb.c b/arch/microblaze/kernel/kgdb.c
new file mode 100644
index 0000000000..df4b9d0112
--- /dev/null
+++ b/arch/microblaze/kernel/kgdb.c
@@ -0,0 +1,152 @@
+/*
+ * Microblaze KGDB support
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/kgdb.h>
+#include <linux/kdebug.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <asm/cacheflush.h>
+#include <asm/asm-offsets.h>
+#include <asm/kgdb.h>
+#include <asm/pvr.h>
+
+#define GDB_REG 0
+#define GDB_PC 32
+#define GDB_MSR 33
+#define GDB_EAR 34
+#define GDB_ESR 35
+#define GDB_FSR 36
+#define GDB_BTR 37
+#define GDB_PVR 38
+#define GDB_REDR 50
+#define GDB_RPID 51
+#define GDB_RZPR 52
+#define GDB_RTLBX 53
+#define GDB_RTLBSX 54 /* mfs can't read it */
+#define GDB_RTLBLO 55
+#define GDB_RTLBHI 56
+
+/* keep pvr separately because it is unchangeable */
+static struct pvr_s pvr;
+
+void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+{
+ unsigned int i;
+ unsigned long *pt_regb = (unsigned long *)regs;
+ int temp;
+
+ /* registers r0 - r31, pc, msr, ear, esr, fsr + do not save pt_mode */
+ for (i = 0; i < (sizeof(struct pt_regs) / 4) - 1; i++)
+ gdb_regs[i] = pt_regb[i];
+
+ /* Branch target register can't be changed */
+ __asm__ __volatile__ ("mfs %0, rbtr;" : "=r"(temp) : );
+ gdb_regs[GDB_BTR] = temp;
+
+ /* pvr part - we have 11 pvr regs */
+ for (i = 0; i < sizeof(struct pvr_s)/4; i++)
+ gdb_regs[GDB_PVR + i] = pvr.pvr[i];
+
+ /* read special registers - can't be changed */
+ __asm__ __volatile__ ("mfs %0, redr;" : "=r"(temp) : );
+ gdb_regs[GDB_REDR] = temp;
+ __asm__ __volatile__ ("mfs %0, rpid;" : "=r"(temp) : );
+ gdb_regs[GDB_RPID] = temp;
+ __asm__ __volatile__ ("mfs %0, rzpr;" : "=r"(temp) : );
+ gdb_regs[GDB_RZPR] = temp;
+ __asm__ __volatile__ ("mfs %0, rtlbx;" : "=r"(temp) : );
+ gdb_regs[GDB_RTLBX] = temp;
+ __asm__ __volatile__ ("mfs %0, rtlblo;" : "=r"(temp) : );
+ gdb_regs[GDB_RTLBLO] = temp;
+ __asm__ __volatile__ ("mfs %0, rtlbhi;" : "=r"(temp) : );
+ gdb_regs[GDB_RTLBHI] = temp;
+}
+
+void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+{
+ unsigned int i;
+ unsigned long *pt_regb = (unsigned long *)regs;
+
+ /* pt_regs and gdb_regs have the same 37 values.
+ * The rest of gdb_regs are unused and can't be changed.
+ * r0 register value can't be changed too. */
+ for (i = 1; i < (sizeof(struct pt_regs) / 4) - 1; i++)
+ pt_regb[i] = gdb_regs[i];
+}
+
+asmlinkage void microblaze_kgdb_break(struct pt_regs *regs)
+{
+ if (kgdb_handle_exception(1, SIGTRAP, 0, regs) != 0)
+ return;
+
+ /* Jump over the first arch_kgdb_breakpoint which is barrier to
+ * get kgdb work. The same solution is used for powerpc */
+ if (*(u32 *) (regs->pc) == *(u32 *) (&arch_kgdb_ops.gdb_bpt_instr))
+ regs->pc += BREAK_INSTR_SIZE;
+}
+
+/* untested */
+void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
+{
+ unsigned int i;
+ unsigned long *pt_regb = (unsigned long *)(p->thread.regs);
+
+ /* registers r0 - r31, pc, msr, ear, esr, fsr + do not save pt_mode */
+ for (i = 0; i < (sizeof(struct pt_regs) / 4) - 1; i++)
+ gdb_regs[i] = pt_regb[i];
+
+ /* pvr part - we have 11 pvr regs */
+ for (i = 0; i < sizeof(struct pvr_s)/4; i++)
+ gdb_regs[GDB_PVR + i] = pvr.pvr[i];
+}
+
+void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)
+{
+ regs->pc = ip;
+}
+
+int kgdb_arch_handle_exception(int vector, int signo, int err_code,
+ char *remcom_in_buffer, char *remcom_out_buffer,
+ struct pt_regs *regs)
+{
+ char *ptr;
+ unsigned long address;
+
+ switch (remcom_in_buffer[0]) {
+ case 'c':
+ /* handle the optional parameter */
+ ptr = &remcom_in_buffer[1];
+ if (kgdb_hex2long(&ptr, &address))
+ regs->pc = address;
+
+ return 0;
+ }
+ return -1; /* this means that we do not want to exit from the handler */
+}
+
+int kgdb_arch_init(void)
+{
+ get_pvr(&pvr); /* Fill PVR structure */
+ return 0;
+}
+
+void kgdb_arch_exit(void)
+{
+ /* Nothing to do */
+}
+
+/*
+ * Global data
+ */
+const struct kgdb_arch arch_kgdb_ops = {
+#ifdef __MICROBLAZEEL__
+ .gdb_bpt_instr = {0x18, 0x00, 0x0c, 0xba}, /* brki r16, 0x18 */
+#else
+ .gdb_bpt_instr = {0xba, 0x0c, 0x00, 0x18}, /* brki r16, 0x18 */
+#endif
+};