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// SPDX-License-Identifier: GPL-2.0
/*
* unaligned.c: Unaligned load/store trap handling with special
* cases for the kernel to do them more quickly.
*
* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 1996 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
*/
#include <linux/kernel.h>
#include <linux/sched/signal.h>
#include <linux/mm.h>
#include <asm/ptrace.h>
#include <asm/processor.h>
#include <linux/uaccess.h>
#include <linux/smp.h>
#include <linux/perf_event.h>
#include <asm/setup.h>
#include "kernel.h"
enum direction {
load, /* ld, ldd, ldh, ldsh */
store, /* st, std, sth, stsh */
both, /* Swap, ldstub, etc. */
fpload,
fpstore,
invalid,
};
static inline enum direction decode_direction(unsigned int insn)
{
unsigned long tmp = (insn >> 21) & 1;
if(!tmp)
return load;
else {
if(((insn>>19)&0x3f) == 15)
return both;
else
return store;
}
}
/* 8 = double-word, 4 = word, 2 = half-word */
static inline int decode_access_size(unsigned int insn)
{
insn = (insn >> 19) & 3;
if(!insn)
return 4;
else if(insn == 3)
return 8;
else if(insn == 2)
return 2;
else {
printk("Impossible unaligned trap. insn=%08x\n", insn);
die_if_kernel("Byte sized unaligned access?!?!", current->thread.kregs);
return 4; /* just to keep gcc happy. */
}
}
/* 0x400000 = signed, 0 = unsigned */
static inline int decode_signedness(unsigned int insn)
{
return (insn & 0x400000);
}
static inline void maybe_flush_windows(unsigned int rs1, unsigned int rs2,
unsigned int rd)
{
if(rs2 >= 16 || rs1 >= 16 || rd >= 16) {
/* Wheee... */
__asm__ __volatile__("save %sp, -0x40, %sp\n\t"
"save %sp, -0x40, %sp\n\t"
"save %sp, -0x40, %sp\n\t"
"save %sp, -0x40, %sp\n\t"
"save %sp, -0x40, %sp\n\t"
"save %sp, -0x40, %sp\n\t"
"save %sp, -0x40, %sp\n\t"
"restore; restore; restore; restore;\n\t"
"restore; restore; restore;\n\t");
}
}
static inline int sign_extend_imm13(int imm)
{
return imm << 19 >> 19;
}
static inline unsigned long fetch_reg(unsigned int reg, struct pt_regs *regs)
{
struct reg_window32 *win;
if(reg < 16)
return (!reg ? 0 : regs->u_regs[reg]);
/* Ho hum, the slightly complicated case. */
win = (struct reg_window32 *) regs->u_regs[UREG_FP];
return win->locals[reg - 16]; /* yes, I know what this does... */
}
static inline unsigned long safe_fetch_reg(unsigned int reg, struct pt_regs *regs)
{
struct reg_window32 __user *win;
unsigned long ret;
if (reg < 16)
return (!reg ? 0 : regs->u_regs[reg]);
/* Ho hum, the slightly complicated case. */
win = (struct reg_window32 __user *) regs->u_regs[UREG_FP];
if ((unsigned long)win & 3)
return -1;
if (get_user(ret, &win->locals[reg - 16]))
return -1;
return ret;
}
static inline unsigned long *fetch_reg_addr(unsigned int reg, struct pt_regs *regs)
{
struct reg_window32 *win;
if(reg < 16)
return ®s->u_regs[reg];
win = (struct reg_window32 *) regs->u_regs[UREG_FP];
return &win->locals[reg - 16];
}
static unsigned long compute_effective_address(struct pt_regs *regs,
unsigned int insn)
{
unsigned int rs1 = (insn >> 14) & 0x1f;
unsigned int rs2 = insn & 0x1f;
unsigned int rd = (insn >> 25) & 0x1f;
if(insn & 0x2000) {
maybe_flush_windows(rs1, 0, rd);
return (fetch_reg(rs1, regs) + sign_extend_imm13(insn));
} else {
maybe_flush_windows(rs1, rs2, rd);
return (fetch_reg(rs1, regs) + fetch_reg(rs2, regs));
}
}
unsigned long safe_compute_effective_address(struct pt_regs *regs,
unsigned int insn)
{
unsigned int rs1 = (insn >> 14) & 0x1f;
unsigned int rs2 = insn & 0x1f;
unsigned int rd = (insn >> 25) & 0x1f;
if(insn & 0x2000) {
maybe_flush_windows(rs1, 0, rd);
return (safe_fetch_reg(rs1, regs) + sign_extend_imm13(insn));
} else {
maybe_flush_windows(rs1, rs2, rd);
return (safe_fetch_reg(rs1, regs) + safe_fetch_reg(rs2, regs));
}
}
/* This is just to make gcc think panic does return... */
static void unaligned_panic(char *str)
{
panic("%s", str);
}
/* una_asm.S */
extern int do_int_load(unsigned long *dest_reg, int size,
unsigned long *saddr, int is_signed);
extern int __do_int_store(unsigned long *dst_addr, int size,
unsigned long *src_val);
static int do_int_store(int reg_num, int size, unsigned long *dst_addr,
struct pt_regs *regs)
{
unsigned long zero[2] = { 0, 0 };
unsigned long *src_val;
if (reg_num)
src_val = fetch_reg_addr(reg_num, regs);
else {
src_val = &zero[0];
if (size == 8)
zero[1] = fetch_reg(1, regs);
}
return __do_int_store(dst_addr, size, src_val);
}
extern void smp_capture(void);
extern void smp_release(void);
static inline void advance(struct pt_regs *regs)
{
regs->pc = regs->npc;
regs->npc += 4;
}
static inline int floating_point_load_or_store_p(unsigned int insn)
{
return (insn >> 24) & 1;
}
static inline int ok_for_kernel(unsigned int insn)
{
return !floating_point_load_or_store_p(insn);
}
static void kernel_mna_trap_fault(struct pt_regs *regs, unsigned int insn)
{
unsigned long g2 = regs->u_regs [UREG_G2];
unsigned long fixup = search_extables_range(regs->pc, &g2);
if (!fixup) {
unsigned long address = compute_effective_address(regs, insn);
if(address < PAGE_SIZE) {
printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference in mna handler");
} else
printk(KERN_ALERT "Unable to handle kernel paging request in mna handler");
printk(KERN_ALERT " at virtual address %08lx\n",address);
printk(KERN_ALERT "current->{mm,active_mm}->context = %08lx\n",
(current->mm ? current->mm->context :
current->active_mm->context));
printk(KERN_ALERT "current->{mm,active_mm}->pgd = %08lx\n",
(current->mm ? (unsigned long) current->mm->pgd :
(unsigned long) current->active_mm->pgd));
die_if_kernel("Oops", regs);
/* Not reached */
}
regs->pc = fixup;
regs->npc = regs->pc + 4;
reg
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