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-rw-r--r--arch/sparc/kernel/traps_32.c394
1 files changed, 394 insertions, 0 deletions
diff --git a/arch/sparc/kernel/traps_32.c b/arch/sparc/kernel/traps_32.c
new file mode 100644
index 000000000..179aabfa7
--- /dev/null
+++ b/arch/sparc/kernel/traps_32.c
@@ -0,0 +1,394 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * arch/sparc/kernel/traps.c
+ *
+ * Copyright 1995, 2008 David S. Miller (davem@davemloft.net)
+ * Copyright 2000 Jakub Jelinek (jakub@redhat.com)
+ */
+
+/*
+ * I hate traps on the sparc, grrr...
+ */
+
+#include <linux/sched/mm.h>
+#include <linux/sched/debug.h>
+#include <linux/mm_types.h>
+#include <linux/kernel.h>
+#include <linux/signal.h>
+#include <linux/smp.h>
+#include <linux/kdebug.h>
+#include <linux/export.h>
+#include <linux/pgtable.h>
+
+#include <asm/delay.h>
+#include <asm/ptrace.h>
+#include <asm/oplib.h>
+#include <asm/page.h>
+#include <asm/unistd.h>
+#include <asm/traps.h>
+
+#include "entry.h"
+#include "kernel.h"
+
+/* #define TRAP_DEBUG */
+
+static void instruction_dump(unsigned long *pc)
+{
+ int i;
+
+ if((((unsigned long) pc) & 3))
+ return;
+
+ for(i = -3; i < 6; i++)
+ printk("%c%08lx%c",i?' ':'<',pc[i],i?' ':'>');
+ printk("\n");
+}
+
+#define __SAVE __asm__ __volatile__("save %sp, -0x40, %sp\n\t")
+#define __RESTORE __asm__ __volatile__("restore %g0, %g0, %g0\n\t")
+
+void __noreturn die_if_kernel(char *str, struct pt_regs *regs)
+{
+ static int die_counter;
+ int count = 0;
+
+ /* Amuse the user. */
+ printk(
+" \\|/ ____ \\|/\n"
+" \"@'/ ,. \\`@\"\n"
+" /_| \\__/ |_\\\n"
+" \\__U_/\n");
+
+ printk("%s(%d): %s [#%d]\n", current->comm, task_pid_nr(current), str, ++die_counter);
+ show_regs(regs);
+ add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
+
+ __SAVE; __SAVE; __SAVE; __SAVE;
+ __SAVE; __SAVE; __SAVE; __SAVE;
+ __RESTORE; __RESTORE; __RESTORE; __RESTORE;
+ __RESTORE; __RESTORE; __RESTORE; __RESTORE;
+
+ {
+ struct reg_window32 *rw = (struct reg_window32 *)regs->u_regs[UREG_FP];
+
+ /* Stop the back trace when we hit userland or we
+ * find some badly aligned kernel stack. Set an upper
+ * bound in case our stack is trashed and we loop.
+ */
+ while(rw &&
+ count++ < 30 &&
+ (((unsigned long) rw) >= PAGE_OFFSET) &&
+ !(((unsigned long) rw) & 0x7)) {
+ printk("Caller[%08lx]: %pS\n", rw->ins[7],
+ (void *) rw->ins[7]);
+ rw = (struct reg_window32 *)rw->ins[6];
+ }
+ }
+ printk("Instruction DUMP:");
+ instruction_dump ((unsigned long *) regs->pc);
+ make_task_dead((regs->psr & PSR_PS) ? SIGKILL : SIGSEGV);
+}
+
+void do_hw_interrupt(struct pt_regs *regs, unsigned long type)
+{
+ if(type < 0x80) {
+ /* Sun OS's puke from bad traps, Linux survives! */
+ printk("Unimplemented Sparc TRAP, type = %02lx\n", type);
+ die_if_kernel("Whee... Hello Mr. Penguin", regs);
+ }
+
+ if(regs->psr & PSR_PS)
+ die_if_kernel("Kernel bad trap", regs);
+
+ force_sig_fault_trapno(SIGILL, ILL_ILLTRP,
+ (void __user *)regs->pc, type - 0x80);
+}
+
+void do_illegal_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+ unsigned long psr)
+{
+ if(psr & PSR_PS)
+ die_if_kernel("Kernel illegal instruction", regs);
+#ifdef TRAP_DEBUG
+ printk("Ill instr. at pc=%08lx instruction is %08lx\n",
+ regs->pc, *(unsigned long *)regs->pc);
+#endif
+
+ send_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)pc, current);
+}
+
+void do_priv_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+ unsigned long psr)
+{
+ if(psr & PSR_PS)
+ die_if_kernel("Penguin instruction from Penguin mode??!?!", regs);
+ send_sig_fault(SIGILL, ILL_PRVOPC, (void __user *)pc, current);
+}
+
+/* XXX User may want to be allowed to do this. XXX */
+
+void do_memaccess_unaligned(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+ unsigned long psr)
+{
+ if(regs->psr & PSR_PS) {
+ printk("KERNEL MNA at pc %08lx npc %08lx called by %08lx\n", pc, npc,
+ regs->u_regs[UREG_RETPC]);
+ die_if_kernel("BOGUS", regs);
+ /* die_if_kernel("Kernel MNA access", regs); */
+ }
+#if 0
+ show_regs (regs);
+ instruction_dump ((unsigned long *) regs->pc);
+ printk ("do_MNA!\n");
+#endif
+ send_sig_fault(SIGBUS, BUS_ADRALN,
+ /* FIXME: Should dig out mna address */ (void *)0,
+ current);
+}
+
+static unsigned long init_fsr = 0x0UL;
+static unsigned long init_fregs[32] __attribute__ ((aligned (8))) =
+ { ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
+ ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
+ ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
+ ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL };
+
+void do_fpd_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+ unsigned long psr)
+{
+ /* Sanity check... */
+ if(psr & PSR_PS)
+ die_if_kernel("Kernel gets FloatingPenguinUnit disabled trap", regs);
+
+ put_psr(get_psr() | PSR_EF); /* Allow FPU ops. */
+ regs->psr |= PSR_EF;
+#ifndef CONFIG_SMP
+ if(last_task_used_math == current)
+ return;
+ if(last_task_used_math) {
+ /* Other processes fpu state, save away */
+ struct task_struct *fptask = last_task_used_math;
+ fpsave(&fptask->thread.float_regs[0], &fptask->thread.fsr,
+ &fptask->thread.fpqueue[0], &fptask->thread.fpqdepth);
+ }
+ last_task_used_math = current;
+ if(used_math()) {
+ fpload(&current->thread.float_regs[0], &current->thread.fsr);
+ } else {
+ /* Set initial sane state. */
+ fpload(&init_fregs[0], &init_fsr);
+ set_used_math();
+ }
+#else
+ if(!used_math()) {
+ fpload(&init_fregs[0], &init_fsr);
+ set_used_math();
+ } else {
+ fpload(&current->thread.float_regs[0], &current->thread.fsr);
+ }
+ set_thread_flag(TIF_USEDFPU);
+#endif
+}
+
+static unsigned long fake_regs[32] __attribute__ ((aligned (8)));
+static unsigned long fake_fsr;
+static unsigned long fake_queue[32] __attribute__ ((aligned (8)));
+static unsigned long fake_depth;
+
+void do_fpe_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+ unsigned long psr)
+{
+ static int calls;
+ unsigned long fsr;
+ int ret = 0;
+ int code;
+#ifndef CONFIG_SMP
+ struct task_struct *fpt = last_task_used_math;
+#else
+ struct task_struct *fpt = current;
+#endif
+ put_psr(get_psr() | PSR_EF);
+ /* If nobody owns the fpu right now, just clear the
+ * error into our fake static buffer and hope it don't
+ * happen again. Thank you crashme...
+ */
+#ifndef CONFIG_SMP
+ if(!fpt) {
+#else
+ if (!test_tsk_thread_flag(fpt, TIF_USEDFPU)) {
+#endif
+ fpsave(&fake_regs[0], &fake_fsr, &fake_queue[0], &fake_depth);
+ regs->psr &= ~PSR_EF;
+ return;
+ }
+ fpsave(&fpt->thread.float_regs[0], &fpt->thread.fsr,
+ &fpt->thread.fpqueue[0], &fpt->thread.fpqdepth);
+#ifdef DEBUG_FPU
+ printk("Hmm, FP exception, fsr was %016lx\n", fpt->thread.fsr);
+#endif
+
+ switch ((fpt->thread.fsr & 0x1c000)) {
+ /* switch on the contents of the ftt [floating point trap type] field */
+#ifdef DEBUG_FPU
+ case (1 << 14):
+ printk("IEEE_754_exception\n");
+ break;
+#endif
+ case (2 << 14): /* unfinished_FPop (underflow & co) */
+ case (3 << 14): /* unimplemented_FPop (quad stuff, maybe sqrt) */
+ ret = do_mathemu(regs, fpt);
+ break;
+#ifdef DEBUG_FPU
+ case (4 << 14):
+ printk("sequence_error (OS bug...)\n");
+ break;
+ case (5 << 14):
+ printk("hardware_error (uhoh!)\n");
+ break;
+ case (6 << 14):
+ printk("invalid_fp_register (user error)\n");
+ break;
+#endif /* DEBUG_FPU */
+ }
+ /* If we successfully emulated the FPop, we pretend the trap never happened :-> */
+ if (ret) {
+ fpload(&current->thread.float_regs[0], &current->thread.fsr);
+ return;
+ }
+ /* nope, better SIGFPE the offending process... */
+
+#ifdef CONFIG_SMP
+ clear_tsk_thread_flag(fpt, TIF_USEDFPU);
+#endif
+ if(psr & PSR_PS) {
+ /* The first fsr store/load we tried trapped,
+ * the second one will not (we hope).
+ */
+ printk("WARNING: FPU exception from kernel mode. at pc=%08lx\n",
+ regs->pc);
+ regs->pc = regs->npc;
+ regs->npc += 4;
+ calls++;
+ if(calls > 2)
+ die_if_kernel("Too many Penguin-FPU traps from kernel mode",
+ regs);
+ return;
+ }
+
+ fsr = fpt->thread.fsr;
+ code = FPE_FLTUNK;
+ if ((fsr & 0x1c000) == (1 << 14)) {
+ if (fsr & 0x10)
+ code = FPE_FLTINV;
+ else if (fsr & 0x08)
+ code = FPE_FLTOVF;
+ else if (fsr & 0x04)
+ code = FPE_FLTUND;
+ else if (fsr & 0x02)
+ code = FPE_FLTDIV;
+ else if (fsr & 0x01)
+ code = FPE_FLTRES;
+ }
+ send_sig_fault(SIGFPE, code, (void __user *)pc, fpt);
+#ifndef CONFIG_SMP
+ last_task_used_math = NULL;
+#endif
+ regs->psr &= ~PSR_EF;
+ if(calls > 0)
+ calls=0;
+}
+
+void handle_tag_overflow(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+ unsigned long psr)
+{
+ if(psr & PSR_PS)
+ die_if_kernel("Penguin overflow trap from kernel mode", regs);
+ send_sig_fault(SIGEMT, EMT_TAGOVF, (void __user *)pc, current);
+}
+
+void handle_watchpoint(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+ unsigned long psr)
+{
+#ifdef TRAP_DEBUG
+ printk("Watchpoint detected at PC %08lx NPC %08lx PSR %08lx\n",
+ pc, npc, psr);
+#endif
+ if(psr & PSR_PS)
+ panic("Tell me what a watchpoint trap is, and I'll then deal "
+ "with such a beast...");
+}
+
+void handle_reg_access(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+ unsigned long psr)
+{
+#ifdef TRAP_DEBUG
+ printk("Register Access Exception at PC %08lx NPC %08lx PSR %08lx\n",
+ pc, npc, psr);
+#endif
+ force_sig_fault(SIGBUS, BUS_OBJERR, (void __user *)pc);
+}
+
+void handle_cp_disabled(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+ unsigned long psr)
+{
+ send_sig_fault(SIGILL, ILL_COPROC, (void __user *)pc, current);
+}
+
+void handle_cp_exception(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+ unsigned long psr)
+{
+#ifdef TRAP_DEBUG
+ printk("Co-Processor Exception at PC %08lx NPC %08lx PSR %08lx\n",
+ pc, npc, psr);
+#endif
+ send_sig_fault(SIGILL, ILL_COPROC, (void __user *)pc, current);
+}
+
+void handle_hw_divzero(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+ unsigned long psr)
+{
+ send_sig_fault(SIGFPE, FPE_INTDIV, (void __user *)pc, current);
+}
+
+#ifdef CONFIG_DEBUG_BUGVERBOSE
+void do_BUG(const char *file, int line)
+{
+ // bust_spinlocks(1); XXX Not in our original BUG()
+ printk("kernel BUG at %s:%d!\n", file, line);
+}
+EXPORT_SYMBOL(do_BUG);
+#endif
+
+/* Since we have our mappings set up, on multiprocessors we can spin them
+ * up here so that timer interrupts work during initialization.
+ */
+
+void trap_init(void)
+{
+ extern void thread_info_offsets_are_bolixed_pete(void);
+
+ /* Force linker to barf if mismatched */
+ if (TI_UWINMASK != offsetof(struct thread_info, uwinmask) ||
+ TI_TASK != offsetof(struct thread_info, task) ||
+ TI_FLAGS != offsetof(struct thread_info, flags) ||
+ TI_CPU != offsetof(struct thread_info, cpu) ||
+ TI_PREEMPT != offsetof(struct thread_info, preempt_count) ||
+ TI_SOFTIRQ != offsetof(struct thread_info, softirq_count) ||
+ TI_HARDIRQ != offsetof(struct thread_info, hardirq_count) ||
+ TI_KSP != offsetof(struct thread_info, ksp) ||
+ TI_KPC != offsetof(struct thread_info, kpc) ||
+ TI_KPSR != offsetof(struct thread_info, kpsr) ||
+ TI_KWIM != offsetof(struct thread_info, kwim) ||
+ TI_REG_WINDOW != offsetof(struct thread_info, reg_window) ||
+ TI_RWIN_SPTRS != offsetof(struct thread_info, rwbuf_stkptrs) ||
+ TI_W_SAVED != offsetof(struct thread_info, w_saved))
+ thread_info_offsets_are_bolixed_pete();
+
+ /* Attach to the address space of init_task. */
+ mmgrab(&init_mm);
+ current->active_mm = &init_mm;
+
+ /* NOTE: Other cpus have this done as they are started
+ * up on SMP.
+ */
+}
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