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-rw-r--r--arch/s390/kernel/traps.c480
1 files changed, 480 insertions, 0 deletions
diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
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+++ b/arch/s390/kernel/traps.c
@@ -0,0 +1,480 @@
+/*
+ * arch/s390/kernel/traps.c
+ *
+ * S390 version
+ * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
+ * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
+ *
+ * Derived from "arch/i386/kernel/traps.c"
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ */
+
+/*
+ * 'Traps.c' handles hardware traps and faults after we have saved some
+ * state in 'asm.s'.
+ */
+#include <linux/config.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/ptrace.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <asm/io.h>
+#include <asm/atomic.h>
+#include <asm/mathemu.h>
+#if CONFIG_REMOTE_DEBUG
+#include <asm/gdb-stub.h>
+#endif
+
+/* Called from entry.S only */
+extern void handle_per_exception(struct pt_regs *regs);
+
+typedef void pgm_check_handler_t(struct pt_regs *, long);
+pgm_check_handler_t *pgm_check_table[128];
+
+extern pgm_check_handler_t default_trap_handler;
+extern pgm_check_handler_t do_page_fault;
+
+asmlinkage int system_call(void);
+
+static inline void console_verbose(void)
+{
+ extern int console_loglevel;
+ console_loglevel = 15;
+}
+
+#define DO_ERROR(trapnr, signr, str, name, tsk) \
+asmlinkage void name(struct pt_regs * regs, long error_code) \
+{ \
+ tsk->thread.error_code = error_code; \
+ tsk->thread.trap_no = trapnr; \
+ die_if_no_fixup(str,regs,error_code); \
+ force_sig(signr, tsk); \
+}
+
+
+void page_exception(void);
+
+/* TODO: define these as 'pgm_check_handler_t xxx;'
+asmlinkage void divide_error(void);
+asmlinkage void debug(void);
+asmlinkage void nmi(void);
+asmlinkage void int3(void);
+asmlinkage void overflow(void);
+asmlinkage void bounds(void);
+asmlinkage void invalid_op(void);
+asmlinkage void device_not_available(void);
+asmlinkage void double_fault(void);
+asmlinkage void coprocessor_segment_overrun(void);
+asmlinkage void invalid_TSS(void);
+asmlinkage void segment_not_present(void);
+asmlinkage void stack_segment(void);
+asmlinkage void general_protection(void);
+asmlinkage void coprocessor_error(void);
+asmlinkage void reserved(void);
+asmlinkage void alignment_check(void);
+asmlinkage void spurious_interrupt_bug(void);
+*/
+
+int kstack_depth_to_print = 24;
+
+/*
+ * These constants are for searching for possible module text
+ * segments. VMALLOC_OFFSET comes from mm/vmalloc.c; MODULE_RANGE is
+ * a guess of how much space is likely to be vmalloced.
+ */
+#define VMALLOC_OFFSET (8*1024*1024)
+#define MODULE_RANGE (8*1024*1024)
+
+void show_crashed_task_info(void)
+{
+ printk("CPU: %d\n",smp_processor_id());
+ printk("Process %s (pid: %d, stackpage=%08X)\n",
+ current->comm, current->pid, 4096+(addr_t)current);
+ show_regs(current,NULL,NULL);
+}
+#if 0
+static void show_registers(struct pt_regs *regs)
+{
+ printk("CPU: %d\nPSW: %08lx %08lx\n",
+ smp_processor_id(), (unsigned long) regs->psw.mask,
+ (unsigned long) regs->psw.addr);
+ printk("GPRS:\n");
+
+ printk("%08lx %08lx %08lx %08lx\n",
+ regs->gprs[0], regs->gprs[1],
+ regs->gprs[2], regs->gprs[3]);
+ printk("%08lx %08lx %08lx %08lx\n",
+ regs->gprs[4], regs->gprs[5],
+ regs->gprs[6], regs->gprs[7]);
+ printk("%08lx %08lx %08lx %08lx\n",
+ regs->gprs[8], regs->gprs[9],
+ regs->gprs[10], regs->gprs[11]);
+ printk("%08lx %08lx %08lx %08lx\n",
+ regs->gprs[12], regs->gprs[13],
+ regs->gprs[14], regs->gprs[15]);
+ printk("Process %s (pid: %d, stackpage=%08lx)\nStack: ",
+ current->comm, current->pid, 4096+(unsigned long)current);
+/*
+ stack = (unsigned long *) esp;
+ for(i=0; i < kstack_depth_to_print; i++) {
+ if (((long) stack & 4095) == 0)
+ break;
+ if (i && ((i % 8) == 0))
+ printk("\n ");
+ printk("%08lx ", get_seg_long(ss,stack++));
+ }
+ printk("\nCall Trace: ");
+ stack = (unsigned long *) esp;
+ i = 1;
+ module_start = PAGE_OFFSET + (max_mapnr << PAGE_SHIFT);
+ module_start = ((module_start + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1));
+ module_end = module_start + MODULE_RANGE;
+ while (((long) stack & 4095) != 0) {
+ addr = get_seg_long(ss, stack++); */
+ /*
+ * If the address is either in the text segment of the
+ * kernel, or in the region which contains vmalloc'ed
+ * memory, it *may* be the address of a calling
+ * routine; if so, print it so that someone tracing
+ * down the cause of the crash will be able to figure
+ * out the call path that was taken.
+ */
+/* if (((addr >= (unsigned long) &_stext) &&
+ (addr <= (unsigned long) &_etext)) ||
+ ((addr >= module_start) && (addr <= module_end))) {
+ if (i && ((i % 8) == 0))
+ printk("\n ");
+ printk("[<%08lx>] ", addr);
+ i++;
+ }
+ }
+ printk("\nCode: ");
+ for(i=0;i<20;i++)
+ printk("%02x ",0xff & get_seg_byte(regs->xcs & 0xffff,(i+(char *)regs->eip)));
+ printk("\n");
+*/
+}
+#endif
+
+
+spinlock_t die_lock;
+
+void die(const char * str, struct pt_regs * regs, long err)
+{
+ console_verbose();
+ spin_lock_irq(&die_lock);
+ printk("%s: %04lx\n", str, err & 0xffff);
+ show_crashed_task_info();
+ spin_unlock_irq(&die_lock);
+ do_exit(SIGSEGV);
+}
+
+int check_for_fixup(struct pt_regs * regs)
+{
+ if (!(regs->psw.mask & PSW_PROBLEM_STATE)) {
+ unsigned long fixup;
+ fixup = search_exception_table(regs->psw.addr);
+ if (fixup) {
+ regs->psw.addr = fixup;
+ return 1;
+ }
+ }
+ return 0;
+}
+
+int do_debugger_trap(struct pt_regs *regs,int signal)
+{
+ if(regs->psw.mask&PSW_PROBLEM_STATE)
+ {
+ if(current->flags & PF_PTRACED)
+ force_sig(signal,current);
+ else
+ return 1;
+ }
+ else
+ {
+#if CONFIG_REMOTE_DEBUG
+ if(gdb_stub_initialised)
+ {
+ gdb_stub_handle_exception((gdb_pt_regs *)regs,signal);
+ return 0;
+ }
+#endif
+ return 1;
+ }
+ return 0;
+}
+
+static void die_if_no_fixup(const char * str, struct pt_regs * regs, long err)
+{
+ if (!(regs->psw.mask & PSW_PROBLEM_STATE)) {
+ unsigned long fixup;
+ fixup = search_exception_table(regs->psw.addr);
+ if (fixup) {
+ regs->psw.addr = fixup;
+ return;
+ }
+ die(str, regs, err);
+ }
+}
+
+asmlinkage void default_trap_handler(struct pt_regs * regs, long error_code)
+{
+ current->thread.error_code = error_code;
+ current->thread.trap_no = error_code;
+ die_if_no_fixup("Unknown program exception",regs,error_code);
+ force_sig(SIGSEGV, current);
+}
+
+DO_ERROR(2, SIGILL, "privileged operation", privileged_op, current)
+DO_ERROR(3, SIGILL, "execute exception", execute_exception, current)
+DO_ERROR(5, SIGSEGV, "addressing exception", addressing_exception, current)
+DO_ERROR(9, SIGFPE, "fixpoint divide exception", divide_exception, current)
+DO_ERROR(0x12, SIGILL, "translation exception", translation_exception, current)
+DO_ERROR(0x13, SIGILL, "special operand exception", special_op_exception, current)
+DO_ERROR(0x15, SIGILL, "operand exception", operand_exception, current)
+
+/* need to define
+DO_ERROR( 6, SIGILL, "invalid operand", invalid_op, current)
+DO_ERROR( 8, SIGSEGV, "double fault", double_fault, current)
+DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun, last_task_used_math)
+DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS, current)
+DO_ERROR(11, SIGBUS, "segment not present", segment_not_present, current)
+DO_ERROR(12, SIGBUS, "stack segment", stack_segment, current)
+DO_ERROR(17, SIGSEGV, "alignment check", alignment_check, current)
+DO_ERROR(18, SIGSEGV, "reserved", reserved, current)
+DO_ERROR(19, SIGSEGV, "cache flush denied", cache_flush_denied, current)
+*/
+
+#ifdef CONFIG_IEEEFPU_EMULATION
+
+asmlinkage void illegal_op(struct pt_regs * regs, long error_code)
+{
+ __u8 opcode[6];
+ __u16 *location;
+ int do_sig = 0;
+ int problem_state=(regs->psw.mask & PSW_PROBLEM_STATE);
+
+ lock_kernel();
+ location = (__u16 *)(regs->psw.addr-S390_lowcore.pgm_ilc);
+ if(problem_state)
+ get_user(*((__u16 *) opcode), location);
+ else
+ *((__u16 *)opcode)=*((__u16 *)location);
+ if(*((__u16 *)opcode)==S390_BREAKPOINT_U16)
+ {
+ if(do_debugger_trap(regs,SIGTRAP))
+ do_sig=1;
+ }
+ else if (problem_state )
+ {
+ if (opcode[0] == 0xb3) {
+ get_user(*((__u16 *) (opcode+2)), location+1);
+ do_sig = math_emu_b3(opcode, regs);
+ } else if (opcode[0] == 0xed) {
+ get_user(*((__u32 *) (opcode+2)),
+ (__u32 *)(location+1));
+ do_sig = math_emu_ed(opcode, regs);
+ } else if (*((__u16 *) opcode) == 0xb299) {
+ get_user(*((__u16 *) (opcode+2)), location+1);
+ do_sig = math_emu_srnm(opcode, regs);
+ } else if (*((__u16 *) opcode) == 0xb29c) {
+ get_user(*((__u16 *) (opcode+2)), location+1);
+ do_sig = math_emu_stfpc(opcode, regs);
+ } else if (*((__u16 *) opcode) == 0xb29d) {
+ get_user(*((__u16 *) (opcode+2)), location+1);
+ do_sig = math_emu_lfpc(opcode, regs);
+ } else
+ do_sig = 1;
+ } else
+ do_sig = 1;
+ if (do_sig) {
+ current->thread.error_code = error_code;
+ current->thread.trap_no = 1;
+ force_sig(SIGILL, current);
+ die_if_no_fixup("illegal operation", regs, error_code);
+ }
+ unlock_kernel();
+}
+
+asmlinkage void specification_exception(struct pt_regs * regs, long error_code)
+{
+ __u8 opcode[6];
+ __u16 *location;
+ int do_sig = 0;
+
+ lock_kernel();
+ if (regs->psw.mask & 0x00010000L) {
+ location = (__u16 *)(regs->psw.addr-S390_lowcore.pgm_ilc);
+ get_user(*((__u16 *) opcode), location);
+ switch (opcode[0]) {
+ case 0x28: /* LDR Rx,Ry */
+ math_emu_ldr(opcode);
+ break;
+ case 0x38: /* LER Rx,Ry */
+ math_emu_ler(opcode);
+ break;
+ case 0x60: /* STD R,D(X,B) */
+ get_user(*((__u16 *) (opcode+2)), location+1);
+ math_emu_std(opcode, regs);
+ break;
+ case 0x68: /* LD R,D(X,B) */
+ get_user(*((__u16 *) (opcode+2)), location+1);
+ math_emu_ld(opcode, regs);
+ break;
+ case 0x70: /* STE R,D(X,B) */
+ get_user(*((__u16 *) (opcode+2)), location+1);
+ math_emu_ste(opcode, regs);
+ break;
+ case 0x78: /* LE R,D(X,B) */
+ get_user(*((__u16 *) (opcode+2)), location+1);
+ math_emu_le(opcode, regs);
+ break;
+ default:
+ do_sig = 1;
+ break;
+ }
+ } else
+ do_sig = 1;
+ if (do_sig) {
+ current->thread.error_code = error_code;
+ current->thread.trap_no = 1;
+ force_sig(SIGILL, current);
+ die_if_no_fixup("illegal operation", regs, error_code);
+ }
+ unlock_kernel();
+}
+
+asmlinkage void data_exception(struct pt_regs * regs, long error_code)
+{
+ __u8 opcode[6];
+ __u16 *location;
+ int do_sig = 0;
+
+ lock_kernel();
+ if (regs->psw.mask & 0x00010000L) {
+ location = (__u16 *)(regs->psw.addr-S390_lowcore.pgm_ilc);
+ get_user(*((__u16 *) opcode), location);
+ switch (opcode[0]) {
+ case 0x28: /* LDR Rx,Ry */
+ math_emu_ldr(opcode);
+ break;
+ case 0x38: /* LER Rx,Ry */
+ math_emu_ler(opcode);
+ break;
+ case 0x60: /* STD R,D(X,B) */
+ get_user(*((__u16 *) (opcode+2)), location+1);
+ math_emu_std(opcode, regs);
+ break;
+ case 0x68: /* LD R,D(X,B) */
+ get_user(*((__u16 *) (opcode+2)), location+1);
+ math_emu_ld(opcode, regs);
+ break;
+ case 0x70: /* STE R,D(X,B) */
+ get_user(*((__u16 *) (opcode+2)), location+1);
+ math_emu_ste(opcode, regs);
+ break;
+ case 0x78: /* LE R,D(X,B) */
+ get_user(*((__u16 *) (opcode+2)), location+1);
+ math_emu_le(opcode, regs);
+ break;
+ case 0xb3:
+ get_user(*((__u16 *) (opcode+2)), location+1);
+ do_sig = math_emu_b3(opcode, regs);
+ break;
+ case 0xed:
+ get_user(*((__u32 *) (opcode+2)),
+ (__u32 *)(location+1));
+ do_sig = math_emu_ed(opcode, regs);
+ break;
+ case 0xb2:
+ if (opcode[1] == 0x99) {
+ get_user(*((__u16 *) (opcode+2)), location+1);
+ do_sig = math_emu_srnm(opcode, regs);
+ } else if (opcode[1] == 0x9c) {
+ get_user(*((__u16 *) (opcode+2)), location+1);
+ do_sig = math_emu_stfpc(opcode, regs);
+ } else if (opcode[1] == 0x9d) {
+ get_user(*((__u16 *) (opcode+2)), location+1);
+ do_sig = math_emu_lfpc(opcode, regs);
+ } else
+ do_sig = 1;
+ break;
+ default:
+ do_sig = 1;
+ break;
+ }
+ } else
+ do_sig = 1;
+ if (do_sig) {
+ current->thread.error_code = error_code;
+ current->thread.trap_no = 1;
+ force_sig(SIGILL, current);
+ die_if_no_fixup("illegal operation", regs, error_code);
+ }
+ unlock_kernel();
+}
+
+#else
+DO_ERROR(1, SIGILL, "illegal operation", illegal_op, current)
+DO_ERROR(6, SIGILL, "specification exception", specification_exception, current)
+DO_ERROR(7, SIGILL, "data exception", data_exception, current)
+#endif /* CONFIG_IEEEFPU_EMULATION */
+
+
+/* init is done in lowcore.S and head.S */
+
+void __init trap_init(void)
+{
+ int i;
+
+ for (i = 0; i < 128; i++)
+ pgm_check_table[i] = &default_trap_handler;
+ pgm_check_table[1] = &illegal_op;
+ pgm_check_table[2] = &privileged_op;
+ pgm_check_table[3] = &execute_exception;
+ pgm_check_table[5] = &addressing_exception;
+ pgm_check_table[6] = &specification_exception;
+ pgm_check_table[7] = &data_exception;
+ pgm_check_table[9] = &divide_exception;
+ pgm_check_table[0x12] = &translation_exception;
+ pgm_check_table[0x13] = &special_op_exception;
+ pgm_check_table[0x15] = &operand_exception;
+ pgm_check_table[4] = &do_page_fault;
+ pgm_check_table[0x10] = &do_page_fault;
+ pgm_check_table[0x11] = &do_page_fault;
+ pgm_check_table[0x1C] = &privileged_op;
+}
+
+
+void handle_per_exception(struct pt_regs *regs)
+{
+ if(regs->psw.mask&PSW_PROBLEM_STATE)
+ {
+ per_struct *per_info=&current->thread.per_info;
+ per_info->lowcore.words.perc_atmid=S390_lowcore.per_perc_atmid;
+ per_info->lowcore.words.address=S390_lowcore.per_address;
+ per_info->lowcore.words.access_id=S390_lowcore.per_access_id;
+ }
+ if(do_debugger_trap(regs,SIGTRAP))
+ {
+ /* I've seen this possibly a task structure being reused ? */
+ printk("Spurious per exception detected\n");
+ printk("switching off per tracing for this task.\n");
+ show_crashed_task_info();
+ /* Hopefully switching off per tracing will help us survive */
+ regs->psw.mask &= ~PSW_PER_MASK;
+ }
+}
+
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