MN10300: Handle misaligned SP-based operands
Support misalignment handling for instructions that have kernel SP-based
address operands, including fixing those that include IMM8 or IMM16
displacements.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/mn10300/mm/misalignment.c b/arch/mn10300/mm/misalignment.c
index a598368..e247a6e 100644
--- a/arch/mn10300/mm/misalignment.c
+++ b/arch/mn10300/mm/misalignment.c
@@ -42,8 +42,9 @@
#define kdebug(FMT, ...) do {} while (0)
#endif
-static int misalignment_addr(unsigned long *registers, unsigned params,
- unsigned opcode, unsigned long disp,
+static int misalignment_addr(unsigned long *registers, unsigned long sp,
+ unsigned params, unsigned opcode,
+ unsigned long disp,
void **_address, unsigned long **_postinc,
unsigned long *_inc);
@@ -322,7 +323,7 @@
const struct exception_table_entry *fixup;
const struct mn10300_opcode *pop;
unsigned long *registers = (unsigned long *) regs;
- unsigned long data, *store, *postinc, disp, inc;
+ unsigned long data, *store, *postinc, disp, inc, sp;
mm_segment_t seg;
siginfo_t info;
uint32_t opcode, noc, xo, xm;
@@ -330,7 +331,12 @@
void *address;
unsigned tmp, npop, dispsz, loop;
- kdebug("==>misalignment({pc=%lx})", regs->pc);
+ if (user_mode(regs))
+ sp = regs->sp;
+ else
+ sp = (unsigned long) regs + sizeof(*regs);
+
+ kdebug("==>misalignment({pc=%lx,sp=%lx})", regs->pc, sp);
if (regs->epsw & EPSW_IE)
asm volatile("or %0,epsw" : : "i"(EPSW_IE));
@@ -496,7 +502,8 @@
if (pop->params[0] & 0x80000000) {
/* move memory to register */
- if (!misalignment_addr(registers, pop->params[0], opcode, disp,
+ if (!misalignment_addr(registers, sp,
+ pop->params[0], opcode, disp,
&address, &postinc, &inc))
goto bad_addr_mode;
@@ -520,7 +527,8 @@
&store))
goto bad_reg_mode;
- if (!misalignment_addr(registers, pop->params[1], opcode, disp,
+ if (!misalignment_addr(registers, sp,
+ pop->params[1], opcode, disp,
&address, &postinc, &inc))
goto bad_addr_mode;
@@ -548,8 +556,9 @@
/*
* determine the address that was being accessed
*/
-static int misalignment_addr(unsigned long *registers, unsigned params,
- unsigned opcode, unsigned long disp,
+static int misalignment_addr(unsigned long *registers, unsigned long sp,
+ unsigned params, unsigned opcode,
+ unsigned long disp,
void **_address, unsigned long **_postinc,
unsigned long *_inc)
{
@@ -618,7 +627,7 @@
address += *postinc;
break;
case SP:
- address += registers[REG_SP >> 2];
+ address += sp;
break;
/* displacements are either to be added to the address
@@ -642,6 +651,12 @@
asm("asr 28,%0" : "=r"(tmp) : "0"(tmp));
disp = (long) tmp;
goto displace_or_inc;
+ case IMM8:
+ disp &= 0x000000ff;
+ goto displace_or_inc;
+ case IMM16:
+ disp &= 0x0000ffff;
+ goto displace_or_inc;
case IMM24:
disp &= 0x00ffffff;
goto displace_or_inc;