[RFC Patch v1 39/55] ARC: kernel diagnostics: show_regs() etc
From: Vineet Gupta
Signed-off-by: Vineet Gupta
---
arch/arc/kernel/troubleshoot.c | 304
arch/arc/mm/tlbex.S| 20 +++
2 files changed, 324 insertions(+), 0 deletions(-)
diff --git a/arch/arc/kernel/troubleshoot.c b/arch/arc/kernel/troubleshoot.c
index 80bfe2a..8a816f2 100644
--- a/arch/arc/kernel/troubleshoot.c
+++ b/arch/arc/kernel/troubleshoot.c
@@ -6,12 +6,316 @@
*/
#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+
+/*
+ * Common routine to print scratch regs (r0-r12) or callee regs (r13-r25)
+ * -Prints 3 regs per line and a CR.
+ * -To continue, callee regs right after scratch, special handling of CR
+ */
+static noinline void print_reg_file(long *reg_rev, int start_num)
+{
+ unsigned int i;
+ char buf[512];
+ int n = 0, len = sizeof(buf);
+
+ /* weird loop because pt_regs regs rev r12..r0, r25..r13 */
+ for (i = start_num; i < start_num + 13; i++) {
+ n += scnprintf(buf + n, len - n, "r%02u: 0x%08lx\t",
+ i, (unsigned long)*reg_rev);
+
+ if (((i + 1) % 3) == 0)
+ n += scnprintf(buf + n, len - n, "\n");
+
+ reg_rev--;
+ }
+
+ if (start_num != 0)
+ n += scnprintf(buf + n, len - n, "\n\n");
+
+ pr_info("%s", buf);
+}
+
+static void show_callee_regs(struct callee_regs *cregs)
+{
+ print_reg_file(&(cregs->r13), 13);
+}
+
+void print_task_path_n_nm(struct task_struct *task, char *buf)
+{
+ struct path path;
+ char *nm = NULL;
+ struct mm_struct *mm;
+ struct file *exe_file;
+ char comm_buf[TASK_COMM_LEN];
+
+ mm = get_task_mm(task);
+ if (!mm)
+ goto done;
+
+ exe_file = get_mm_exe_file(mm);
+ mmput(mm);
+
+ if (exe_file) {
+ path = exe_file->f_path;
+ path_get(_file->f_path);
+ fput(exe_file);
+ nm = d_path(, buf, 255);
+ path_put();
+ }
+
+done:
+ pr_info("task = %s '%s', TGID %u PID = %u\n", nm,
+ get_task_comm(comm_buf, task), task->tgid, task->pid);
+}
+EXPORT_SYMBOL(print_task_path_n_nm);
+
+static void show_faulting_vma(unsigned long address, char *buf)
+{
+ struct vm_area_struct *vma;
+ struct inode *inode;
+ unsigned long ino = 0;
+ dev_t dev = 0;
+ char *nm = buf;
+
+ vma = find_vma(current->active_mm, address);
+
+ /* check against the find_vma( ) behaviour which returns the next VMA
+* if the container VMA is not found
+*/
+ if (vma && (vma->vm_start <= address)) {
+ struct file *file = vma->vm_file;
+ if (file) {
+ struct path *path = >f_path;
+ nm = d_path(path, buf, PAGE_SIZE - 1);
+ inode = vma->vm_file->f_path.dentry->d_inode;
+ dev = inode->i_sb->s_dev;
+ ino = inode->i_ino;
+ }
+ pr_info("@off 0x%lx in [%s]\n"
+ "VMA: 0x%08lx to 0x%08lx\n\n",
+ address - vma->vm_start, nm, vma->vm_start, vma->vm_end);
+ } else
+ pr_info("@No matching VMA found\n");
+}
+
+static void show_ecr_verbose(struct pt_regs *regs)
+{
+ unsigned int vec, cause_code, cause_reg;
+ unsigned long address;
+
+ cause_reg = current->thread.cause_code;
+ pr_info("\n[ECR]: 0x%08x => ", cause_reg);
+
+ /* For Data fault, this is data address not instruction addr */
+ address = current->thread.fault_address;
+
+ vec = cause_reg >> 16;
+ cause_code = (cause_reg >> 8) & 0xFF;
+
+ /* For DTLB Miss or ProtV, display the memory involved too */
+ if (vec == ECR_V_DTLB_MISS) {
+ pr_cont("Invalid (%s) @ 0x%08lx by insn @ 0x%08lx\n",
+ (cause_code == 0x01) ? "Read From" :
+ ((cause_code == 0x02) ? "Write to" : "EX"),
+ address, regs->ret);
+ } else if (vec == ECR_V_ITLB_MISS) {
+ pr_cont("Insn could not be fetched\n");
+ } else if (vec == ECR_V_MACH_CHK) {
+ pr_cont("%s\n", (cause_code == 0x0) ?
+ "Double Fault" : "Other Fatal Err");
+
+ } else if (vec == ECR_V_PROTV) {
+ if (cause_code == ECR_C_PROTV_INST_FETCH)
+ pr_cont("Execute from Non-exec Page\n");
+ else if (cause_code == ECR_C_PROTV_LOAD)
+ pr_cont("Read from Non-readable Page\n");
+ else if (cause_code == ECR_C_PROTV_STORE)
+ pr_cont("Write to Non-writable Page\n");
+ else if (cause_code == ECR_C_PROTV_XCHG)
+ pr_cont("Data exchange protection violation\n");
+
[RFC Patch v1 39/55] ARC: kernel diagnostics: show_regs() etc
From: Vineet Gupta vgu...@synopsys.com
Signed-off-by: Vineet Gupta vgu...@synopsys.com
---
arch/arc/kernel/troubleshoot.c | 304
arch/arc/mm/tlbex.S| 20 +++
2 files changed, 324 insertions(+), 0 deletions(-)
diff --git a/arch/arc/kernel/troubleshoot.c b/arch/arc/kernel/troubleshoot.c
index 80bfe2a..8a816f2 100644
--- a/arch/arc/kernel/troubleshoot.c
+++ b/arch/arc/kernel/troubleshoot.c
@@ -6,12 +6,316 @@
*/
#include linux/ptrace.h
+#include linux/module.h
+#include linux/mm.h
+#include linux/fs.h
+#include linux/kdev_t.h
+#include linux/fs_struct.h
+#include linux/proc_fs.h
+#include linux/file.h
+#include asm/arcregs.h
+#include asm/event-log.h
+
+/*
+ * Common routine to print scratch regs (r0-r12) or callee regs (r13-r25)
+ * -Prints 3 regs per line and a CR.
+ * -To continue, callee regs right after scratch, special handling of CR
+ */
+static noinline void print_reg_file(long *reg_rev, int start_num)
+{
+ unsigned int i;
+ char buf[512];
+ int n = 0, len = sizeof(buf);
+
+ /* weird loop because pt_regs regs rev r12..r0, r25..r13 */
+ for (i = start_num; i start_num + 13; i++) {
+ n += scnprintf(buf + n, len - n, r%02u: 0x%08lx\t,
+ i, (unsigned long)*reg_rev);
+
+ if (((i + 1) % 3) == 0)
+ n += scnprintf(buf + n, len - n, \n);
+
+ reg_rev--;
+ }
+
+ if (start_num != 0)
+ n += scnprintf(buf + n, len - n, \n\n);
+
+ pr_info(%s, buf);
+}
+
+static void show_callee_regs(struct callee_regs *cregs)
+{
+ print_reg_file((cregs-r13), 13);
+}
+
+void print_task_path_n_nm(struct task_struct *task, char *buf)
+{
+ struct path path;
+ char *nm = NULL;
+ struct mm_struct *mm;
+ struct file *exe_file;
+ char comm_buf[TASK_COMM_LEN];
+
+ mm = get_task_mm(task);
+ if (!mm)
+ goto done;
+
+ exe_file = get_mm_exe_file(mm);
+ mmput(mm);
+
+ if (exe_file) {
+ path = exe_file-f_path;
+ path_get(exe_file-f_path);
+ fput(exe_file);
+ nm = d_path(path, buf, 255);
+ path_put(path);
+ }
+
+done:
+ pr_info(task = %s '%s', TGID %u PID = %u\n, nm,
+ get_task_comm(comm_buf, task), task-tgid, task-pid);
+}
+EXPORT_SYMBOL(print_task_path_n_nm);
+
+static void show_faulting_vma(unsigned long address, char *buf)
+{
+ struct vm_area_struct *vma;
+ struct inode *inode;
+ unsigned long ino = 0;
+ dev_t dev = 0;
+ char *nm = buf;
+
+ vma = find_vma(current-active_mm, address);
+
+ /* check against the find_vma( ) behaviour which returns the next VMA
+* if the container VMA is not found
+*/
+ if (vma (vma-vm_start = address)) {
+ struct file *file = vma-vm_file;
+ if (file) {
+ struct path *path = file-f_path;
+ nm = d_path(path, buf, PAGE_SIZE - 1);
+ inode = vma-vm_file-f_path.dentry-d_inode;
+ dev = inode-i_sb-s_dev;
+ ino = inode-i_ino;
+ }
+ pr_info(@off 0x%lx in [%s]\n
+ VMA: 0x%08lx to 0x%08lx\n\n,
+ address - vma-vm_start, nm, vma-vm_start, vma-vm_end);
+ } else
+ pr_info(@No matching VMA found\n);
+}
+
+static void show_ecr_verbose(struct pt_regs *regs)
+{
+ unsigned int vec, cause_code, cause_reg;
+ unsigned long address;
+
+ cause_reg = current-thread.cause_code;
+ pr_info(\n[ECR]: 0x%08x = , cause_reg);
+
+ /* For Data fault, this is data address not instruction addr */
+ address = current-thread.fault_address;
+
+ vec = cause_reg 16;
+ cause_code = (cause_reg 8) 0xFF;
+
+ /* For DTLB Miss or ProtV, display the memory involved too */
+ if (vec == ECR_V_DTLB_MISS) {
+ pr_cont(Invalid (%s) @ 0x%08lx by insn @ 0x%08lx\n,
+ (cause_code == 0x01) ? Read From :
+ ((cause_code == 0x02) ? Write to : EX),
+ address, regs-ret);
+ } else if (vec == ECR_V_ITLB_MISS) {
+ pr_cont(Insn could not be fetched\n);
+ } else if (vec == ECR_V_MACH_CHK) {
+ pr_cont(%s\n, (cause_code == 0x0) ?
+ Double Fault : Other Fatal Err);
+
+ } else if (vec == ECR_V_PROTV) {
+ if (cause_code == ECR_C_PROTV_INST_FETCH)
+ pr_cont(Execute from Non-exec Page\n);
+ else if (cause_code == ECR_C_PROTV_LOAD)
+ pr_cont(Read from Non-readable Page\n);
+ else if (cause_code == ECR_C_PROTV_STORE)
+ pr_cont(Write to Non-writable Page\n);
+
