arm64: dts: Revert "specify console via command line"
[linux/fpc-iii.git] / arch / sparc / kernel / traps_32.c
blob4ceecad556a9f8cb1ac377574a84a0bea6767527
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * arch/sparc/kernel/traps.c
5 * Copyright 1995, 2008 David S. Miller (davem@davemloft.net)
6 * Copyright 2000 Jakub Jelinek (jakub@redhat.com)
7 */
9 /*
10 * I hate traps on the sparc, grrr...
13 #include <linux/sched/mm.h>
14 #include <linux/sched/debug.h>
15 #include <linux/mm_types.h>
16 #include <linux/kernel.h>
17 #include <linux/signal.h>
18 #include <linux/smp.h>
19 #include <linux/kdebug.h>
20 #include <linux/export.h>
22 #include <asm/delay.h>
23 #include <asm/ptrace.h>
24 #include <asm/oplib.h>
25 #include <asm/page.h>
26 #include <asm/pgtable.h>
27 #include <asm/unistd.h>
28 #include <asm/traps.h>
30 #include "entry.h"
31 #include "kernel.h"
33 /* #define TRAP_DEBUG */
35 static void instruction_dump(unsigned long *pc)
37 int i;
39 if((((unsigned long) pc) & 3))
40 return;
42 for(i = -3; i < 6; i++)
43 printk("%c%08lx%c",i?' ':'<',pc[i],i?' ':'>');
44 printk("\n");
47 #define __SAVE __asm__ __volatile__("save %sp, -0x40, %sp\n\t")
48 #define __RESTORE __asm__ __volatile__("restore %g0, %g0, %g0\n\t")
50 void __noreturn die_if_kernel(char *str, struct pt_regs *regs)
52 static int die_counter;
53 int count = 0;
55 /* Amuse the user. */
56 printk(
57 " \\|/ ____ \\|/\n"
58 " \"@'/ ,. \\`@\"\n"
59 " /_| \\__/ |_\\\n"
60 " \\__U_/\n");
62 printk("%s(%d): %s [#%d]\n", current->comm, task_pid_nr(current), str, ++die_counter);
63 show_regs(regs);
64 add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
66 __SAVE; __SAVE; __SAVE; __SAVE;
67 __SAVE; __SAVE; __SAVE; __SAVE;
68 __RESTORE; __RESTORE; __RESTORE; __RESTORE;
69 __RESTORE; __RESTORE; __RESTORE; __RESTORE;
72 struct reg_window32 *rw = (struct reg_window32 *)regs->u_regs[UREG_FP];
74 /* Stop the back trace when we hit userland or we
75 * find some badly aligned kernel stack. Set an upper
76 * bound in case our stack is trashed and we loop.
78 while(rw &&
79 count++ < 30 &&
80 (((unsigned long) rw) >= PAGE_OFFSET) &&
81 !(((unsigned long) rw) & 0x7)) {
82 printk("Caller[%08lx]: %pS\n", rw->ins[7],
83 (void *) rw->ins[7]);
84 rw = (struct reg_window32 *)rw->ins[6];
87 printk("Instruction DUMP:");
88 instruction_dump ((unsigned long *) regs->pc);
89 if(regs->psr & PSR_PS)
90 do_exit(SIGKILL);
91 do_exit(SIGSEGV);
94 void do_hw_interrupt(struct pt_regs *regs, unsigned long type)
96 if(type < 0x80) {
97 /* Sun OS's puke from bad traps, Linux survives! */
98 printk("Unimplemented Sparc TRAP, type = %02lx\n", type);
99 die_if_kernel("Whee... Hello Mr. Penguin", regs);
102 if(regs->psr & PSR_PS)
103 die_if_kernel("Kernel bad trap", regs);
105 force_sig_fault(SIGILL, ILL_ILLTRP,
106 (void __user *)regs->pc, type - 0x80);
109 void do_illegal_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc,
110 unsigned long psr)
112 if(psr & PSR_PS)
113 die_if_kernel("Kernel illegal instruction", regs);
114 #ifdef TRAP_DEBUG
115 printk("Ill instr. at pc=%08lx instruction is %08lx\n",
116 regs->pc, *(unsigned long *)regs->pc);
117 #endif
119 send_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)pc, 0, current);
122 void do_priv_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc,
123 unsigned long psr)
125 if(psr & PSR_PS)
126 die_if_kernel("Penguin instruction from Penguin mode??!?!", regs);
127 send_sig_fault(SIGILL, ILL_PRVOPC, (void __user *)pc, 0, current);
130 /* XXX User may want to be allowed to do this. XXX */
132 void do_memaccess_unaligned(struct pt_regs *regs, unsigned long pc, unsigned long npc,
133 unsigned long psr)
135 if(regs->psr & PSR_PS) {
136 printk("KERNEL MNA at pc %08lx npc %08lx called by %08lx\n", pc, npc,
137 regs->u_regs[UREG_RETPC]);
138 die_if_kernel("BOGUS", regs);
139 /* die_if_kernel("Kernel MNA access", regs); */
141 #if 0
142 show_regs (regs);
143 instruction_dump ((unsigned long *) regs->pc);
144 printk ("do_MNA!\n");
145 #endif
146 send_sig_fault(SIGBUS, BUS_ADRALN,
147 /* FIXME: Should dig out mna address */ (void *)0,
148 0, current);
151 static unsigned long init_fsr = 0x0UL;
152 static unsigned long init_fregs[32] __attribute__ ((aligned (8))) =
153 { ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
154 ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
155 ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
156 ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL };
158 void do_fpd_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
159 unsigned long psr)
161 /* Sanity check... */
162 if(psr & PSR_PS)
163 die_if_kernel("Kernel gets FloatingPenguinUnit disabled trap", regs);
165 put_psr(get_psr() | PSR_EF); /* Allow FPU ops. */
166 regs->psr |= PSR_EF;
167 #ifndef CONFIG_SMP
168 if(last_task_used_math == current)
169 return;
170 if(last_task_used_math) {
171 /* Other processes fpu state, save away */
172 struct task_struct *fptask = last_task_used_math;
173 fpsave(&fptask->thread.float_regs[0], &fptask->thread.fsr,
174 &fptask->thread.fpqueue[0], &fptask->thread.fpqdepth);
176 last_task_used_math = current;
177 if(used_math()) {
178 fpload(&current->thread.float_regs[0], &current->thread.fsr);
179 } else {
180 /* Set initial sane state. */
181 fpload(&init_fregs[0], &init_fsr);
182 set_used_math();
184 #else
185 if(!used_math()) {
186 fpload(&init_fregs[0], &init_fsr);
187 set_used_math();
188 } else {
189 fpload(&current->thread.float_regs[0], &current->thread.fsr);
191 set_thread_flag(TIF_USEDFPU);
192 #endif
195 static unsigned long fake_regs[32] __attribute__ ((aligned (8)));
196 static unsigned long fake_fsr;
197 static unsigned long fake_queue[32] __attribute__ ((aligned (8)));
198 static unsigned long fake_depth;
200 void do_fpe_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
201 unsigned long psr)
203 static int calls;
204 unsigned long fsr;
205 int ret = 0;
206 int code;
207 #ifndef CONFIG_SMP
208 struct task_struct *fpt = last_task_used_math;
209 #else
210 struct task_struct *fpt = current;
211 #endif
212 put_psr(get_psr() | PSR_EF);
213 /* If nobody owns the fpu right now, just clear the
214 * error into our fake static buffer and hope it don't
215 * happen again. Thank you crashme...
217 #ifndef CONFIG_SMP
218 if(!fpt) {
219 #else
220 if (!test_tsk_thread_flag(fpt, TIF_USEDFPU)) {
221 #endif
222 fpsave(&fake_regs[0], &fake_fsr, &fake_queue[0], &fake_depth);
223 regs->psr &= ~PSR_EF;
224 return;
226 fpsave(&fpt->thread.float_regs[0], &fpt->thread.fsr,
227 &fpt->thread.fpqueue[0], &fpt->thread.fpqdepth);
228 #ifdef DEBUG_FPU
229 printk("Hmm, FP exception, fsr was %016lx\n", fpt->thread.fsr);
230 #endif
232 switch ((fpt->thread.fsr & 0x1c000)) {
233 /* switch on the contents of the ftt [floating point trap type] field */
234 #ifdef DEBUG_FPU
235 case (1 << 14):
236 printk("IEEE_754_exception\n");
237 break;
238 #endif
239 case (2 << 14): /* unfinished_FPop (underflow & co) */
240 case (3 << 14): /* unimplemented_FPop (quad stuff, maybe sqrt) */
241 ret = do_mathemu(regs, fpt);
242 break;
243 #ifdef DEBUG_FPU
244 case (4 << 14):
245 printk("sequence_error (OS bug...)\n");
246 break;
247 case (5 << 14):
248 printk("hardware_error (uhoh!)\n");
249 break;
250 case (6 << 14):
251 printk("invalid_fp_register (user error)\n");
252 break;
253 #endif /* DEBUG_FPU */
255 /* If we successfully emulated the FPop, we pretend the trap never happened :-> */
256 if (ret) {
257 fpload(&current->thread.float_regs[0], &current->thread.fsr);
258 return;
260 /* nope, better SIGFPE the offending process... */
262 #ifdef CONFIG_SMP
263 clear_tsk_thread_flag(fpt, TIF_USEDFPU);
264 #endif
265 if(psr & PSR_PS) {
266 /* The first fsr store/load we tried trapped,
267 * the second one will not (we hope).
269 printk("WARNING: FPU exception from kernel mode. at pc=%08lx\n",
270 regs->pc);
271 regs->pc = regs->npc;
272 regs->npc += 4;
273 calls++;
274 if(calls > 2)
275 die_if_kernel("Too many Penguin-FPU traps from kernel mode",
276 regs);
277 return;
280 fsr = fpt->thread.fsr;
281 code = FPE_FLTUNK;
282 if ((fsr & 0x1c000) == (1 << 14)) {
283 if (fsr & 0x10)
284 code = FPE_FLTINV;
285 else if (fsr & 0x08)
286 code = FPE_FLTOVF;
287 else if (fsr & 0x04)
288 code = FPE_FLTUND;
289 else if (fsr & 0x02)
290 code = FPE_FLTDIV;
291 else if (fsr & 0x01)
292 code = FPE_FLTRES;
294 send_sig_fault(SIGFPE, code, (void __user *)pc, 0, fpt);
295 #ifndef CONFIG_SMP
296 last_task_used_math = NULL;
297 #endif
298 regs->psr &= ~PSR_EF;
299 if(calls > 0)
300 calls=0;
303 void handle_tag_overflow(struct pt_regs *regs, unsigned long pc, unsigned long npc,
304 unsigned long psr)
306 if(psr & PSR_PS)
307 die_if_kernel("Penguin overflow trap from kernel mode", regs);
308 send_sig_fault(SIGEMT, EMT_TAGOVF, (void __user *)pc, 0, current);
311 void handle_watchpoint(struct pt_regs *regs, unsigned long pc, unsigned long npc,
312 unsigned long psr)
314 #ifdef TRAP_DEBUG
315 printk("Watchpoint detected at PC %08lx NPC %08lx PSR %08lx\n",
316 pc, npc, psr);
317 #endif
318 if(psr & PSR_PS)
319 panic("Tell me what a watchpoint trap is, and I'll then deal "
320 "with such a beast...");
323 void handle_reg_access(struct pt_regs *regs, unsigned long pc, unsigned long npc,
324 unsigned long psr)
326 #ifdef TRAP_DEBUG
327 printk("Register Access Exception at PC %08lx NPC %08lx PSR %08lx\n",
328 pc, npc, psr);
329 #endif
330 force_sig_fault(SIGBUS, BUS_OBJERR, (void __user *)pc, 0);
333 void handle_cp_disabled(struct pt_regs *regs, unsigned long pc, unsigned long npc,
334 unsigned long psr)
336 send_sig_fault(SIGILL, ILL_COPROC, (void __user *)pc, 0, current);
339 void handle_cp_exception(struct pt_regs *regs, unsigned long pc, unsigned long npc,
340 unsigned long psr)
342 #ifdef TRAP_DEBUG
343 printk("Co-Processor Exception at PC %08lx NPC %08lx PSR %08lx\n",
344 pc, npc, psr);
345 #endif
346 send_sig_fault(SIGILL, ILL_COPROC, (void __user *)pc, 0, current);
349 void handle_hw_divzero(struct pt_regs *regs, unsigned long pc, unsigned long npc,
350 unsigned long psr)
352 send_sig_fault(SIGFPE, FPE_INTDIV, (void __user *)pc, 0, current);
355 #ifdef CONFIG_DEBUG_BUGVERBOSE
356 void do_BUG(const char *file, int line)
358 // bust_spinlocks(1); XXX Not in our original BUG()
359 printk("kernel BUG at %s:%d!\n", file, line);
361 EXPORT_SYMBOL(do_BUG);
362 #endif
364 /* Since we have our mappings set up, on multiprocessors we can spin them
365 * up here so that timer interrupts work during initialization.
368 void trap_init(void)
370 extern void thread_info_offsets_are_bolixed_pete(void);
372 /* Force linker to barf if mismatched */
373 if (TI_UWINMASK != offsetof(struct thread_info, uwinmask) ||
374 TI_TASK != offsetof(struct thread_info, task) ||
375 TI_FLAGS != offsetof(struct thread_info, flags) ||
376 TI_CPU != offsetof(struct thread_info, cpu) ||
377 TI_PREEMPT != offsetof(struct thread_info, preempt_count) ||
378 TI_SOFTIRQ != offsetof(struct thread_info, softirq_count) ||
379 TI_HARDIRQ != offsetof(struct thread_info, hardirq_count) ||
380 TI_KSP != offsetof(struct thread_info, ksp) ||
381 TI_KPC != offsetof(struct thread_info, kpc) ||
382 TI_KPSR != offsetof(struct thread_info, kpsr) ||
383 TI_KWIM != offsetof(struct thread_info, kwim) ||
384 TI_REG_WINDOW != offsetof(struct thread_info, reg_window) ||
385 TI_RWIN_SPTRS != offsetof(struct thread_info, rwbuf_stkptrs) ||
386 TI_W_SAVED != offsetof(struct thread_info, w_saved))
387 thread_info_offsets_are_bolixed_pete();
389 /* Attach to the address space of init_task. */
390 mmgrab(&init_mm);
391 current->active_mm = &init_mm;
393 /* NOTE: Other cpus have this done as they are started
394 * up on SMP.