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// SPDX-License-Identifier: GPL-2.0
/*
* Emulation of the "brl" instruction for IA64 processors that
* don't support it in hardware.
* Author: Stephan Zeisset, Intel Corp. <Stephan.Zeisset@intel.com>
*
* 02/22/02 D. Mosberger Clear si_flgs, si_isr, and si_imm to avoid
* leaking kernel bits.
*/
#include <linux/kernel.h>
#include <linux/sched/signal.h>
#include <linux/uaccess.h>
#include <asm/processor.h>
extern char ia64_set_b1, ia64_set_b2, ia64_set_b3, ia64_set_b4, ia64_set_b5;
struct illegal_op_return {
unsigned long fkt, arg1, arg2, arg3;
};
/*
* The unimplemented bits of a virtual address must be set
* to the value of the most significant implemented bit.
* unimpl_va_mask includes all unimplemented bits and
* the most significant implemented bit, so the result
* of an and operation with the mask must be all 0's
* or all 1's for the address to be valid.
*/
#define unimplemented_virtual_address(va) ( \
((va) & local_cpu_data->unimpl_va_mask) != 0 && \
((va) & local_cpu_data->unimpl_va_mask) != local_cpu_data->unimpl_va_mask \
)
/*
* The unimplemented bits of a physical address must be 0.
* unimpl_pa_mask includes all unimplemented bits, so the result
* of an and operation with the mask must be all 0's for the
* address to be valid.
*/
#define unimplemented_physical_address(pa) ( \
((pa) & local_cpu_data->unimpl_pa_mask) != 0 \
)
/*
* Handle an illegal operation fault that was caused by an
* unimplemented "brl" instruction.
* If we are not successful (e.g because the illegal operation
* wasn't caused by a "brl" after all), we return -1.
* If we are successful, we return either 0 or the address
* of a "fixup" function for manipulating preserved register
* state.
*/
struct illegal_op_return
ia64_emulate_brl (struct pt_regs *regs, unsigned long ar_ec)
{
unsigned long bundle[2];
unsigned long opcode, btype, qp, offset, cpl;
unsigned long next_ip;
struct illegal_op_return rv;
long tmp_taken, unimplemented_address;
rv.fkt = (unsigned long) -1;
/*
* Decode the instruction bundle.
*/
if (copy_from_user(bundle, (void *) (regs->cr_iip), sizeof(bundle)))
return rv;
next_ip = (unsigned long) regs->cr_iip + 16;
/* "brl" must be in slot 2. */
if (ia64_psr(regs)->ri != 1) return rv;
/* Must be "mlx" template */
if ((bundle[0] & 0x1e) != 0x4) return rv;
opcode = (bundle[1] >> 60);
btype = ((bundle[1] >> 29) & 0x7);
qp = ((bundle[1] >> 23) & 0x3f);
offset = ((bundle[1] & 0x0800000000000000L) << 4)
| ((bundle[1] & 0x00fffff000000000L) >> 32)
| ((bundle[1] & 0x00000000007fffffL) << 40)
| ((bundle[0] & 0xffff000000000000L) >> 24);
tmp_taken = regs->pr & (1L << qp);
switch(opcode) {
case 0xC:
/*
* Long Branch.
*/
if (btype != 0) return rv;
rv.fkt = 0;
if (!(tmp_taken)) {
/*
* Qualifying predicate is 0.
* Skip instruction.
*/
regs->cr_iip = next_ip;
ia64_psr(regs)->ri = 0;
return rv;
}
break;
case 0xD:
/*
* Long Call.
*/
rv.fkt = 0;
if (!(tmp_taken)) {
/*
* Qualifying predicate is 0.
* Skip instruction.
*/
regs->cr_iip = next_ip;
ia64_psr(regs)->ri = 0;
return rv;
}
/*
* BR[btype] = IP+16
*/
switch(btype) {
case 0:
regs->b0 = next_ip;
break;
case 1:
rv.fkt = (unsigned long) &ia64_set_b1;
break;
case 2:
rv.fkt = (unsigned long) &ia64_set_b2;
break;
case 3:
rv.fkt = (unsigned long) &ia64_set_b3;
break;
case 4:
rv.fkt = (unsigned long) &ia64_set_b4;
break;
case 5:
rv.fkt = (unsigned long) &ia64_set_b5;
break;
case 6:
regs->b6 = next_ip;
break;
case 7:
regs->b7 = next_ip;
break;
}
rv.arg1 = next_ip;
/*
* AR[PFS].pfm = CFM
* AR[PFS].pec = AR[EC]
* AR[PFS].ppl = PSR.cpl
*/
cpl = ia64_psr(regs)->cpl;
regs->ar_pfs = ((regs->cr_ifs & 0x3fffffffff)
| (ar_ec << 52) | (cpl << 62));
/*
* CFM.sof -= CFM.sol
* CFM.sol = 0
* CFM.sor = 0
* CFM.rrb.gr = 0
* CFM.rrb.fr = 0
* CFM.rrb.pr = 0
*/
regs->cr_ifs = ((regs->cr_ifs & 0xffffffc00000007f)
- ((regs->cr_ifs >> 7) & 0x7f));
break;
default:
/*
* Unknown opcode.
*/
return rv;
}
regs->cr_iip += offset;
ia64_psr(regs)->ri = 0;
if (ia64_psr(regs)->it == 0)
unimplemented_address = unimplemented_physical_address(regs->cr_iip);
else
unimplemented_address = unimplemented_virtual_address(regs->cr_iip);
if (unimplemented_address) {
/*
* The target address contains unimplemented bits.
*/
printk(KERN_DEBUG "Woah! Unimplemented Instruction Address Trap!\n");
force_sig_fault(SIGILL, ILL_BADIADDR, (void __user *)NULL,
0, 0, 0);
} else if (ia64_psr(regs)->tb) {
/*
* Branch Tracing is enabled.
* Force a taken branch signal.
*/
force_sig_fault(SIGTRAP, TRAP_BRANCH, (void __user *)NULL,
0, 0, 0);
} else if (ia64_psr(regs)->ss) {
/*
* Single Step is enabled.
* Force a trace signal.
*/
force_sig_fault(SIGTRAP, TRAP_TRACE, (void __user *)NULL,
0, 0, 0);
}
return rv;
}
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