From 1543e317f1da31b75942316931e8f491a8920811 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Thu, 04 Jan 2024 10:08:02 +0000
Subject: [PATCH] disable FB
---
kernel/arch/mips/kernel/branch.c | 73 +++++++++++++++++++++---------------
1 files changed, 42 insertions(+), 31 deletions(-)
diff --git a/kernel/arch/mips/kernel/branch.c b/kernel/arch/mips/kernel/branch.c
index e48f6c0..0216ff2 100644
--- a/kernel/arch/mips/kernel/branch.c
+++ b/kernel/arch/mips/kernel/branch.c
@@ -20,6 +20,8 @@
#include <asm/ptrace.h>
#include <linux/uaccess.h>
+#include "probes-common.h"
+
/*
* Calculate and return exception PC in case of branch delay slot
* for microMIPS and MIPS16e. It does not clear the ISA mode bit.
@@ -32,7 +34,7 @@
/* Calculate exception PC in branch delay slot. */
if (__get_user(inst, (u16 __user *) msk_isa16_mode(epc))) {
/* This should never happen because delay slot was checked. */
- force_sig(SIGSEGV, current);
+ force_sig(SIGSEGV);
return epc;
}
if (cpu_has_mips16) {
@@ -58,9 +60,7 @@
unsigned long *contpc)
{
union mips_instruction insn = (union mips_instruction)dec_insn.insn;
- int bc_false = 0;
- unsigned int fcr31;
- unsigned int bit;
+ int __maybe_unused bc_false = 0;
if (!cpu_has_mmips)
return 0;
@@ -92,7 +92,7 @@
regs->regs[31] = regs->cp0_epc +
dec_insn.pc_inc +
dec_insn.next_pc_inc;
- /* Fall through */
+ fallthrough;
case mm_bltz_op:
if ((long)regs->regs[insn.mm_i_format.rs] < 0)
*contpc = regs->cp0_epc +
@@ -108,7 +108,7 @@
regs->regs[31] = regs->cp0_epc +
dec_insn.pc_inc +
dec_insn.next_pc_inc;
- /* Fall through */
+ fallthrough;
case mm_bgez_op:
if ((long)regs->regs[insn.mm_i_format.rs] >= 0)
*contpc = regs->cp0_epc +
@@ -139,10 +139,14 @@
dec_insn.pc_inc +
dec_insn.next_pc_inc;
return 1;
+#ifdef CONFIG_MIPS_FP_SUPPORT
case mm_bc2f_op:
- case mm_bc1f_op:
+ case mm_bc1f_op: {
+ unsigned int fcr31;
+ unsigned int bit;
+
bc_false = 1;
- /* Fall through */
+ fallthrough;
case mm_bc2t_op:
case mm_bc1t_op:
preempt_disable();
@@ -167,6 +171,8 @@
dec_insn.pc_inc + dec_insn.next_pc_inc;
return 1;
}
+#endif /* CONFIG_MIPS_FP_SUPPORT */
+ }
break;
case mm_pool16c_op:
switch (insn.mm_i_format.rt) {
@@ -174,7 +180,7 @@
case mm_jalrs16_op:
regs->regs[31] = regs->cp0_epc +
dec_insn.pc_inc + dec_insn.next_pc_inc;
- /* Fall through */
+ fallthrough;
case mm_jr16_op:
*contpc = regs->regs[insn.mm_i_format.rs];
return 1;
@@ -235,7 +241,7 @@
case mm_jal32_op:
regs->regs[31] = regs->cp0_epc +
dec_insn.pc_inc + dec_insn.next_pc_inc;
- /* Fall through */
+ fallthrough;
case mm_j32_op:
*contpc = regs->cp0_epc + dec_insn.pc_inc;
*contpc >>= 27;
@@ -301,7 +307,7 @@
return 0;
sigsegv:
- force_sig(SIGSEGV, current);
+ force_sig(SIGSEGV);
return -EFAULT;
}
@@ -324,7 +330,7 @@
/* Read the instruction. */
addr = (u16 __user *)msk_isa16_mode(epc);
if (__get_user(inst.full, addr)) {
- force_sig(SIGSEGV, current);
+ force_sig(SIGSEGV);
return -EFAULT;
}
@@ -339,7 +345,7 @@
case MIPS16e_jal_op:
addr += 1;
if (__get_user(inst2, addr)) {
- force_sig(SIGSEGV, current);
+ force_sig(SIGSEGV);
return -EFAULT;
}
fullinst = ((unsigned)inst.full << 16) | inst2;
@@ -416,8 +422,8 @@
int __compute_return_epc_for_insn(struct pt_regs *regs,
union mips_instruction insn)
{
- unsigned int bit, fcr31, dspcontrol, reg;
long epc = regs->cp0_epc;
+ unsigned int dspcontrol;
int ret = 0;
switch (insn.i_format.opcode) {
@@ -428,7 +434,7 @@
switch (insn.r_format.func) {
case jalr_op:
regs->regs[insn.r_format.rd] = epc + 8;
- /* Fall through */
+ fallthrough;
case jr_op:
if (NO_R6EMU && insn.r_format.func == jr_op)
goto sigill_r2r6;
@@ -447,6 +453,7 @@
case bltzl_op:
if (NO_R6EMU)
goto sigill_r2r6;
+ fallthrough;
case bltz_op:
if ((long)regs->regs[insn.i_format.rs] < 0) {
epc = epc + 4 + (insn.i_format.simmediate << 2);
@@ -460,6 +467,7 @@
case bgezl_op:
if (NO_R6EMU)
goto sigill_r2r6;
+ fallthrough;
case bgez_op:
if ((long)regs->regs[insn.i_format.rs] >= 0) {
epc = epc + 4 + (insn.i_format.simmediate << 2);
@@ -555,6 +563,7 @@
case jalx_op:
case jal_op:
regs->regs[31] = regs->cp0_epc + 8;
+ fallthrough;
case j_op:
epc += 4;
epc >>= 28;
@@ -571,6 +580,7 @@
case beql_op:
if (NO_R6EMU)
goto sigill_r2r6;
+ fallthrough;
case beq_op:
if (regs->regs[insn.i_format.rs] ==
regs->regs[insn.i_format.rt]) {
@@ -585,6 +595,7 @@
case bnel_op:
if (NO_R6EMU)
goto sigill_r2r6;
+ fallthrough;
case bne_op:
if (regs->regs[insn.i_format.rs] !=
regs->regs[insn.i_format.rt]) {
@@ -599,6 +610,7 @@
case blezl_op: /* not really i_format */
if (!insn.i_format.rt && NO_R6EMU)
goto sigill_r2r6;
+ fallthrough;
case blez_op:
/*
* Compact branches for R6 for the
@@ -634,6 +646,7 @@
case bgtzl_op:
if (!insn.i_format.rt && NO_R6EMU)
goto sigill_r2r6;
+ fallthrough;
case bgtz_op:
/*
* Compact branches for R6 for the
@@ -667,23 +680,18 @@
regs->cp0_epc = epc;
break;
+#ifdef CONFIG_MIPS_FP_SUPPORT
/*
* And now the FPA/cp1 branch instructions.
*/
- case cop1_op:
+ case cop1_op: {
+ unsigned int bit, fcr31, reg;
+
if (cpu_has_mips_r6 &&
((insn.i_format.rs == bc1eqz_op) ||
(insn.i_format.rs == bc1nez_op))) {
- if (!used_math()) { /* First time FPU user */
- ret = init_fpu();
- if (ret && NO_R6EMU) {
- ret = -ret;
- break;
- }
- ret = 0;
- set_used_math();
- }
- lose_fpu(1); /* Save FPU state for the emulator. */
+ if (!init_fp_ctx(current))
+ lose_fpu(1);
reg = insn.i_format.rt;
bit = get_fpr32(¤t->thread.fpu.fpr[reg], 0) & 0x1;
if (insn.i_format.rs == bc1eqz_op)
@@ -736,6 +744,9 @@
}
break;
}
+ }
+#endif /* CONFIG_MIPS_FP_SUPPORT */
+
#ifdef CONFIG_CPU_CAVIUM_OCTEON
case lwc2_op: /* This is bbit0 on Octeon */
if ((regs->regs[insn.i_format.rs] & (1ull<<insn.i_format.rt))
@@ -820,17 +831,17 @@
sigill_dsp:
pr_debug("%s: DSP branch but not DSP ASE - sending SIGILL.\n",
current->comm);
- force_sig(SIGILL, current);
+ force_sig(SIGILL);
return -EFAULT;
sigill_r2r6:
pr_debug("%s: R2 branch but r2-to-r6 emulator is not present - sending SIGILL.\n",
current->comm);
- force_sig(SIGILL, current);
+ force_sig(SIGILL);
return -EFAULT;
sigill_r6:
pr_debug("%s: R6 branch but no MIPSr6 ISA support - sending SIGILL.\n",
current->comm);
- force_sig(SIGILL, current);
+ force_sig(SIGILL);
return -EFAULT;
}
EXPORT_SYMBOL_GPL(__compute_return_epc_for_insn);
@@ -850,7 +861,7 @@
*/
addr = (unsigned int __user *) epc;
if (__get_user(insn.word, addr)) {
- force_sig(SIGSEGV, current);
+ force_sig(SIGSEGV);
return -EFAULT;
}
@@ -858,7 +869,7 @@
unaligned:
printk("%s: unaligned epc - sending SIGBUS.\n", current->comm);
- force_sig(SIGBUS, current);
+ force_sig(SIGBUS);
return -EFAULT;
}
--
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