Support the MIPS32 / MIPS64 DSP ASE.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

14 files changed, 308 insertions, 82 deletions

diff --git a/arch/mips/kernel/asm-offsets.c b/arch/mips/kernel/asm-offsets.c
index af69cdb..ca6b03c 100644
--- a/arch/mips/kernel/asm-offsets.c
+++ b/arch/mips/kernel/asm-offsets.c
@@ -95,7 +95,7 @@ void output_thread_info_defines(void)
 	offset("#define TI_PRE_COUNT       ", struct thread_info, preempt_count);
 	offset("#define TI_ADDR_LIMIT      ", struct thread_info, addr_limit);
 	offset("#define TI_RESTART_BLOCK   ", struct thread_info, restart_block);
-	offset("#define TI_TP_VALUE        ", struct thread_info, tp_value);
+	offset("#define TI_TP_VALUE	   ", struct thread_info, tp_value);
 	constant("#define _THREAD_SIZE_ORDER ", THREAD_SIZE_ORDER);
 	constant("#define _THREAD_SIZE       ", THREAD_SIZE);
 	constant("#define _THREAD_MASK       ", THREAD_MASK);
@@ -241,6 +241,7 @@ void output_mm_defines(void)
 	linefeed;
 }
 
+#ifdef CONFIG_32BIT
 void output_sc_defines(void)
 {
 	text("/* Linux sigcontext offsets. */");
@@ -252,10 +253,29 @@ void output_sc_defines(void)
 	offset("#define SC_STATUS     ", struct sigcontext, sc_status);
 	offset("#define SC_FPC_CSR    ", struct sigcontext, sc_fpc_csr);
 	offset("#define SC_FPC_EIR    ", struct sigcontext, sc_fpc_eir);
-	offset("#define SC_CAUSE      ", struct sigcontext, sc_cause);
-	offset("#define SC_BADVADDR   ", struct sigcontext, sc_badvaddr);
+	offset("#define SC_HI1        ", struct sigcontext, sc_hi1);
+	offset("#define SC_LO1        ", struct sigcontext, sc_lo1);
+	offset("#define SC_HI2        ", struct sigcontext, sc_hi2);
+	offset("#define SC_LO2        ", struct sigcontext, sc_lo2);
+	offset("#define SC_HI3        ", struct sigcontext, sc_hi3);
+	offset("#define SC_LO3        ", struct sigcontext, sc_lo3);
 	linefeed;
 }
+#endif
+
+#ifdef CONFIG_64BIT
+void output_sc_defines(void)
+{
+	text("/* Linux sigcontext offsets. */");
+	offset("#define SC_REGS       ", struct sigcontext, sc_regs);
+	offset("#define SC_FPREGS     ", struct sigcontext, sc_fpregs);
+	offset("#define SC_MDHI       ", struct sigcontext, sc_hi);
+	offset("#define SC_MDLO       ", struct sigcontext, sc_lo);
+	offset("#define SC_PC         ", struct sigcontext, sc_pc);
+	offset("#define SC_FPC_CSR    ", struct sigcontext, sc_fpc_csr);
+	linefeed;
+}
+#endif
 
 #ifdef CONFIG_MIPS32_COMPAT
 void output_sc32_defines(void)
diff --git a/arch/mips/kernel/branch.c b/arch/mips/kernel/branch.c
index 56aea5f..374de83 100644
--- a/arch/mips/kernel/branch.c
+++ b/arch/mips/kernel/branch.c
@@ -22,7 +22,7 @@
  */
 int __compute_return_epc(struct pt_regs *regs)
 {
-	unsigned int *addr, bit, fcr31;
+	unsigned int *addr, bit, fcr31, dspcontrol;
 	long epc;
 	union mips_instruction insn;
 
@@ -99,6 +99,18 @@ int __compute_return_epc(struct pt_regs *regs)
 				epc += 8;
 			regs->cp0_epc = epc;
 			break;
+		case bposge32_op:
+			if (!cpu_has_dsp)
+				goto sigill;
+
+			dspcontrol = rddsp(0x01);
+
+			if (dspcontrol >= 32) {
+				epc = epc + 4 + (insn.i_format.simmediate << 2);
+			} else
+				epc += 8;
+			regs->cp0_epc = epc;
+			break;
 		}
 		break;
 
@@ -200,4 +212,9 @@ unaligned:
 	printk("%s: unaligned epc - sending SIGBUS.\n", current->comm);
 	force_sig(SIGBUS, current);
 	return -EFAULT;
+
+sigill:
+	printk("%s: DSP branch but not DSP ASE - sending SIGBUS.\n", current->comm);
+	force_sig(SIGBUS, current);
+	return -EFAULT;
 }
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index 552d2b6..1ae7762 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -482,6 +482,8 @@ static inline unsigned int decode_config3(struct cpuinfo_mips *c)
 
 	if (config3 & MIPS_CONF3_SM)
 		c->ases |= MIPS_ASE_SMARTMIPS;
+	if (config3 & MIPS_CONF3_DSP)
+		c->ases |= MIPS_ASE_DSP;
 
 	return config3 & MIPS_CONF_M;
 }
@@ -529,6 +531,7 @@ static inline void cpu_probe_mips(struct cpuinfo_mips *c)
 		c->cputype = CPU_20KC;
 		break;
 	case PRID_IMP_24K:
+	case PRID_IMP_24KE:
 		c->cputype = CPU_24K;
 		break;
 	case PRID_IMP_25KF:
diff --git a/arch/mips/kernel/genex.S b/arch/mips/kernel/genex.S
index e5021c7..349ec30 100644
--- a/arch/mips/kernel/genex.S
+++ b/arch/mips/kernel/genex.S
@@ -291,6 +291,7 @@ NESTED(nmi_handler, PT_SIZE, sp)
 	BUILD_HANDLER mdmx mdmx sti silent		/* #22 */
 	BUILD_HANDLER watch watch sti verbose		/* #23 */
 	BUILD_HANDLER mcheck mcheck cli verbose		/* #24 */
+	BUILD_HANDLER dsp dsp sti silent		/* #26 */
 	BUILD_HANDLER reserved reserved sti verbose	/* others */
 
 #ifdef CONFIG_64BIT
diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index 368526a..9843209 100644
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -25,8 +25,10 @@
 #include <linux/init.h>
 #include <linux/completion.h>
 
+#include <asm/abi.h>
 #include <asm/bootinfo.h>
 #include <asm/cpu.h>
+#include <asm/dsp.h>
 #include <asm/fpu.h>
 #include <asm/pgtable.h>
 #include <asm/system.h>
@@ -54,6 +56,54 @@ ATTRIB_NORET void cpu_idle(void)
 	}
 }
 
+extern int do_signal(sigset_t *oldset, struct pt_regs *regs);
+extern int do_signal32(sigset_t *oldset, struct pt_regs *regs);
+
+/*
+ * Native o32 and N64 ABI without DSP ASE
+ */
+extern void setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
+        int signr, sigset_t *set);
+extern void setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
+        int signr, sigset_t *set, siginfo_t *info);
+
+struct mips_abi mips_abi = {
+	.do_signal	= do_signal,
+#ifdef CONFIG_TRAD_SIGNALS
+	.setup_frame	= setup_frame,
+#endif
+	.setup_rt_frame	= setup_rt_frame
+};
+
+#ifdef CONFIG_MIPS32_O32
+/*
+ * o32 compatibility on 64-bit kernels, without DSP ASE
+ */
+extern void setup_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
+        int signr, sigset_t *set);
+extern void setup_rt_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
+        int signr, sigset_t *set, siginfo_t *info);
+
+struct mips_abi mips_abi_32 = {
+	.do_signal	= do_signal32,
+	.setup_frame	= setup_frame_32,
+	.setup_rt_frame	= setup_rt_frame_32
+};
+#endif /* CONFIG_MIPS32_O32 */
+
+#ifdef CONFIG_MIPS32_N32
+/*
+ * N32 on 64-bit kernels, without DSP ASE
+ */
+extern void setup_rt_frame_n32(struct k_sigaction * ka, struct pt_regs *regs,
+        int signr, sigset_t *set, siginfo_t *info);
+
+struct mips_abi mips_abi_n32 = {
+	.do_signal	= do_signal,
+	.setup_rt_frame	= setup_rt_frame_n32
+};
+#endif /* CONFIG_MIPS32_N32 */
+
 asmlinkage void ret_from_fork(void);
 
 void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp)
@@ -70,6 +120,8 @@ void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp)
 	regs->cp0_status = status;
 	clear_used_math();
 	lose_fpu();
+	if (cpu_has_dsp)
+		__init_dsp();
 	regs->cp0_epc = pc;
 	regs->regs[29] = sp;
 	current_thread_info()->addr_limit = USER_DS;
@@ -95,9 +147,11 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
 
 	preempt_disable();
 
-	if (is_fpu_owner()) {
+	if (is_fpu_owner())
 		save_fp(p);
-	}
+
+	if (cpu_has_dsp)
+		save_dsp(p);
 
 	preempt_enable();
 
diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c
index 49821ee..2441e32 100644
--- a/arch/mips/kernel/ptrace.c
+++ b/arch/mips/kernel/ptrace.c
@@ -30,6 +30,7 @@
 
 #include <asm/byteorder.h>
 #include <asm/cpu.h>
+#include <asm/dsp.h>
 #include <asm/fpu.h>
 #include <asm/mipsregs.h>
 #include <asm/pgtable.h>
@@ -176,6 +177,27 @@ asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
 			write_c0_status(flags);
 			break;
 		}
+		case DSP_BASE ... DSP_BASE + 5:
+			if (!cpu_has_dsp) {
+				tmp = 0;
+				ret = -EIO;
+				goto out_tsk;
+			}
+			if (child->thread.dsp.used_dsp) {
+				dspreg_t *dregs = __get_dsp_regs(child);
+				tmp = (unsigned long) (dregs[addr - DSP_BASE]);
+			} else {
+				tmp = -1;	/* DSP registers yet used  */
+			}
+			break;
+		case DSP_CONTROL:
+			if (!cpu_has_dsp) {
+				tmp = 0;
+				ret = -EIO;
+				goto out_tsk;
+			}
+			tmp = child->thread.dsp.dspcontrol;
+			break;
 		default:
 			tmp = 0;
 			ret = -EIO;
@@ -248,6 +270,22 @@ asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
 			else
 				child->thread.fpu.soft.fcr31 = data;
 			break;
+		case DSP_BASE ... DSP_BASE + 5:
+			if (!cpu_has_dsp) {
+				ret = -EIO;
+				break;
+			}
+
+			dspreg_t *dregs = __get_dsp_regs(child);
+			dregs[addr - DSP_BASE] = data;
+			break;
+		case DSP_CONTROL:
+			if (!cpu_has_dsp) {
+				ret = -EIO;
+				break;
+			}
+			child->thread.dsp.dspcontrol = data;
+			break;
 		default:
 			/* The rest are not allowed. */
 			ret = -EIO;
diff --git a/arch/mips/kernel/ptrace32.c b/arch/mips/kernel/ptrace32.c
index eb446e5..5c45a58 100644
--- a/arch/mips/kernel/ptrace32.c
+++ b/arch/mips/kernel/ptrace32.c
@@ -26,6 +26,7 @@
 #include <linux/security.h>
 
 #include <asm/cpu.h>
+#include <asm/dsp.h>
 #include <asm/fpu.h>
 #include <asm/mipsregs.h>
 #include <asm/pgtable.h>
@@ -161,6 +162,27 @@ asmlinkage int sys32_ptrace(int request, int pid, int addr, int data)
 			write_c0_status(flags);
 			break;
 		}
+		case DSP_BASE ... DSP_BASE + 5:
+			if (!cpu_has_dsp) {
+				tmp = 0;
+				ret = -EIO;
+				goto out_tsk;
+			}
+			if (child->thread.dsp.used_dsp) {
+				dspreg_t *dregs = __get_dsp_regs(child);
+				tmp = (unsigned long) (dregs[addr - DSP_BASE]);
+			} else {
+				tmp = -1;	/* DSP registers yet used  */
+			}
+			break;
+		case DSP_CONTROL:
+			if (!cpu_has_dsp) {
+				tmp = 0;
+				ret = -EIO;
+				goto out_tsk;
+			}
+			tmp = child->thread.dsp.dspcontrol;
+			break;
 		default:
 			tmp = 0;
 			ret = -EIO;
@@ -230,6 +252,22 @@ asmlinkage int sys32_ptrace(int request, int pid, int addr, int data)
 			else
 				child->thread.fpu.soft.fcr31 = data;
 			break;
+		case DSP_BASE ... DSP_BASE + 5:
+			if (!cpu_has_dsp) {
+				ret = -EIO;
+				break;
+			}
+
+			dspreg_t *dregs = __get_dsp_regs(child);
+			dregs[addr - DSP_BASE] = data;
+			break;
+		case DSP_CONTROL:
+			if (!cpu_has_dsp) {
+				ret = -EIO;
+				break;
+			}
+			child->thread.dsp.dspcontrol = data;
+			break;
 		default:
 			/* The rest are not allowed. */
 			ret = -EIO;
diff --git a/arch/mips/kernel/r4k_fpu.S b/arch/mips/kernel/r4k_fpu.S
index 1a14c6b..283a985 100644
--- a/arch/mips/kernel/r4k_fpu.S
+++ b/arch/mips/kernel/r4k_fpu.S
@@ -32,7 +32,7 @@
 
 	.set	noreorder
 	.set	mips3
-	/* Save floating point context */
+
 LEAF(_save_fp_context)
 	cfc1	t1, fcr31
 
@@ -74,9 +74,6 @@ LEAF(_save_fp_context)
 	EX	sdc1 $f28, SC_FPREGS+224(a0)
 	EX	sdc1 $f30, SC_FPREGS+240(a0)
 	EX	sw t1, SC_FPC_CSR(a0)
-	cfc1	t0, $0				# implementation/version
-	EX	sw t0, SC_FPC_EIR(a0)
-
 	jr	ra
 	 li	v0, 0					# success
 	END(_save_fp_context)
diff --git a/arch/mips/kernel/scall32-o32.S b/arch/mips/kernel/scall32-o32.S
index 6fa1112..c389dba 100644
--- a/arch/mips/kernel/scall32-o32.S
+++ b/arch/mips/kernel/scall32-o32.S
@@ -620,7 +620,7 @@ einval:	li	v0, -EINVAL
 	sys	sys_ni_syscall		0	/* sys_vserver */
 	sys	sys_waitid		5
 	sys	sys_ni_syscall		0	/* available, was setaltroot */
-	sys	sys_add_key		5
+	sys	sys_add_key		5	/* 4280 */
 	sys	sys_request_key		4
 	sys	sys_keyctl		5
 	sys	sys_set_thread_area	1
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index 6fc51b2..9253dcc 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -549,3 +549,12 @@ int __init fpu_disable(char *s)
 }
 
 __setup("nofpu", fpu_disable);
+
+int __init dsp_disable(char *s)
+{
+	cpu_data[0].ases &= ~MIPS_ASE_DSP;
+
+	return 1;
+}
+
+__setup("nodsp", dsp_disable);
diff --git a/arch/mips/kernel/signal-common.h b/arch/mips/kernel/signal-common.h
index f9234df..3208ff5 100644
--- a/arch/mips/kernel/signal-common.h
+++ b/arch/mips/kernel/signal-common.h
@@ -8,13 +8,14 @@
  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
  */
 
+#include <linux/config.h>
+
 static inline int
 setup_sigcontext(struct pt_regs *regs, struct sigcontext *sc)
 {
 	int err = 0;
 
 	err |= __put_user(regs->cp0_epc, &sc->sc_pc);
-	err |= __put_user(regs->cp0_status, &sc->sc_status);
 
 #define save_gp_reg(i) do {						\
 	err |= __put_user(regs->regs[i], &sc->sc_regs[i]);		\
@@ -30,10 +31,32 @@ setup_sigcontext(struct pt_regs *regs, struct sigcontext *sc)
 	save_gp_reg(31);
 #undef save_gp_reg
 
+#ifdef CONFIG_32BIT
 	err |= __put_user(regs->hi, &sc->sc_mdhi);
 	err |= __put_user(regs->lo, &sc->sc_mdlo);
-	err |= __put_user(regs->cp0_cause, &sc->sc_cause);
-	err |= __put_user(regs->cp0_badvaddr, &sc->sc_badvaddr);
+	if (cpu_has_dsp) {
+		err |= __put_user(mfhi1(), &sc->sc_hi1);
+		err |= __put_user(mflo1(), &sc->sc_lo1);
+		err |= __put_user(mfhi2(), &sc->sc_hi2);
+		err |= __put_user(mflo2(), &sc->sc_lo2);
+		err |= __put_user(mfhi3(), &sc->sc_hi3);
+		err |= __put_user(mflo3(), &sc->sc_lo3);
+		err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
+	}
+#endif
+#ifdef CONFIG_64BIT
+	err |= __put_user(regs->hi, &sc->sc_hi[0]);
+	err |= __put_user(regs->lo, &sc->sc_lo[0]);
+	if (cpu_has_dsp) {
+		err |= __put_user(mfhi1(), &sc->sc_hi[1]);
+		err |= __put_user(mflo1(), &sc->sc_lo[1]);
+		err |= __put_user(mfhi2(), &sc->sc_hi[2]);
+		err |= __put_user(mflo2(), &sc->sc_lo[2]);
+		err |= __put_user(mfhi3(), &sc->sc_hi[3]);
+		err |= __put_user(mflo3(), &sc->sc_lo[3]);
+		err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
+	}
+#endif
 
 	err |= __put_user(!!used_math(), &sc->sc_used_math);
 
@@ -61,15 +84,40 @@ out:
 static inline int
 restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc)
 {
-	int err = 0;
 	unsigned int used_math;
+	unsigned long treg;
+	int err = 0;
 
 	/* Always make any pending restarted system calls return -EINTR */
 	current_thread_info()->restart_block.fn = do_no_restart_syscall;
 
 	err |= __get_user(regs->cp0_epc, &sc->sc_pc);
+#ifdef CONFIG_32BIT
 	err |= __get_user(regs->hi, &sc->sc_mdhi);
 	err |= __get_user(regs->lo, &sc->sc_mdlo);
+	if (cpu_has_dsp) {
+		err |= __get_user(treg, &sc->sc_hi1); mthi1(treg);
+		err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
+		err |= __get_user(treg, &sc->sc_hi2); mthi2(treg);
+		err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
+		err |= __get_user(treg, &sc->sc_hi3); mthi3(treg);
+		err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
+		err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
+	}
+#endif
+#ifdef CONFIG_64BIT
+	err |= __get_user(regs->hi, &sc->sc_hi[0]);
+	err |= __get_user(regs->lo, &sc->sc_lo[0]);
+	if (cpu_has_dsp) {
+		err |= __get_user(treg, &sc->sc_hi[1]); mthi1(treg);
+		err |= __get_user(treg, &sc->sc_lo[1]); mthi1(treg);
+		err |= __get_user(treg, &sc->sc_hi[2]); mthi2(treg);
+		err |= __get_user(treg, &sc->sc_lo[2]); mthi2(treg);
+		err |= __get_user(treg, &sc->sc_hi[3]); mthi3(treg);
+		err |= __get_user(treg, &sc->sc_lo[3]); mthi3(treg);
+		err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
+	}
+#endif
 
 #define restore_gp_reg(i) do {						\
 	err |= __get_user(regs->regs[i], &sc->sc_regs[i]);		\
diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c
index eb12723..8504feb 100644
--- a/arch/mips/kernel/signal.c
+++ b/arch/mips/kernel/signal.c
@@ -21,6 +21,7 @@
 #include <linux/unistd.h>
 #include <linux/compiler.h>
 
+#include <asm/abi.h>
 #include <asm/asm.h>
 #include <linux/bitops.h>
 #include <asm/cacheflush.h>
@@ -36,7 +37,7 @@
 
 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
 
-static int do_signal(sigset_t *oldset, struct pt_regs *regs);
+int do_signal(sigset_t *oldset, struct pt_regs *regs);
 
 /*
  * Atomically swap in the new signal mask, and wait for a signal.
@@ -216,7 +217,7 @@ _sys_sigreturn(nabi_no_regargs struct pt_regs regs)
 badframe:
 	force_sig(SIGSEGV, current);
 }
-#endif
+#endif /* CONFIG_TRAD_SIGNALS */
 
 save_static_function(sys_rt_sigreturn);
 __attribute_used__ noinline static void
@@ -262,7 +263,7 @@ badframe:
 }
 
 #ifdef CONFIG_TRAD_SIGNALS
-static void inline setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
+void setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
 	int signr, sigset_t *set)
 {
 	struct sigframe *frame;
@@ -318,7 +319,7 @@ give_sigsegv:
 }
 #endif
 
-static void inline setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
+void setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
 	int signr, sigset_t *set, siginfo_t *info)
 {
 	struct rt_sigframe *frame;
@@ -410,22 +411,10 @@ static inline void handle_signal(unsigned long sig, siginfo_t *info,
 
 	regs->regs[0] = 0;		/* Don't deal with this again.  */
 
-#ifdef CONFIG_TRAD_SIGNALS
-	if (ka->sa.sa_flags & SA_SIGINFO) {
-#else
-	if (1) {
-#endif
-#ifdef CONFIG_MIPS32_N32
-		if ((current->thread.mflags & MF_ABI_MASK) == MF_N32)
-			setup_rt_frame_n32 (ka, regs, sig, oldset, info);
-		else
-#endif
-			setup_rt_frame(ka, regs, sig, oldset, info);
-	}
-#ifdef CONFIG_TRAD_SIGNALS
+	if (sig_uses_siginfo(ka))
+		current->thread.abi->setup_rt_frame(ka, regs, sig, oldset, info);
 	else
-		setup_frame(ka, regs, sig, oldset);
-#endif
+		current->thread.abi->setup_frame(ka, regs, sig, oldset);
 
 	spin_lock_irq(&current->sighand->siglock);
 	sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
@@ -435,21 +424,12 @@ static inline void handle_signal(unsigned long sig, siginfo_t *info,
 	spin_unlock_irq(&current->sighand->siglock);
 }
 
-extern int do_signal32(sigset_t *oldset, struct pt_regs *regs);
-extern int do_irix_signal(sigset_t *oldset, struct pt_regs *regs);
-
-static int do_signal(sigset_t *oldset, struct pt_regs *regs)
+int do_signal(sigset_t *oldset, struct pt_regs *regs)
 {
 	struct k_sigaction ka;
 	siginfo_t info;
 	int signr;
 
-#ifdef CONFIG_BINFMT_ELF32
-	if ((current->thread.mflags & MF_ABI_MASK) == MF_O32) {
-		return do_signal32(oldset, regs);
-	}
-#endif
-
 	/*
 	 * We want the common case to go fast, which is why we may in certain
 	 * cases get here from kernel mode. Just return without doing anything
@@ -501,18 +481,6 @@ asmlinkage void do_notify_resume(struct pt_regs *regs, sigset_t *oldset,
 {
 	/* deal with pending signal delivery */
 	if (thread_info_flags & _TIF_SIGPENDING) {
-#ifdef CONFIG_BINFMT_ELF32
-		if (likely((current->thread.mflags & MF_ABI_MASK) == MF_O32)) {
-			do_signal32(oldset, regs);
-			return;
-		}
-#endif
-#ifdef CONFIG_BINFMT_IRIX
-		if (unlikely(current->personality != PER_LINUX)) {
-			do_irix_signal(oldset, regs);
-			return;
-		}
-#endif
-		do_signal(oldset, regs);
+		current->thread.abi->do_signal(oldset, regs);
 	}
 }
diff --git a/arch/mips/kernel/signal32.c b/arch/mips/kernel/signal32.c
index 5e7d0fa..8639e24 100644
--- a/arch/mips/kernel/signal32.c
+++ b/arch/mips/kernel/signal32.c
@@ -21,6 +21,7 @@
 #include <linux/suspend.h>
 #include <linux/compiler.h>
 
+#include <asm/abi.h>
 #include <asm/asm.h>
 #include <linux/bitops.h>
 #include <asm/cacheflush.h>
@@ -334,8 +335,9 @@ asmlinkage int sys32_sigaltstack(nabi_no_regargs struct pt_regs regs)
 
 static int restore_sigcontext32(struct pt_regs *regs, struct sigcontext32 *sc)
 {
+	u32 used_math;
 	int err = 0;
-	__u32 used_math;
+	s32 treg;
 
 	/* Always make any pending restarted system calls return -EINTR */
 	current_thread_info()->restart_block.fn = do_no_restart_syscall;
@@ -343,6 +345,15 @@ static int restore_sigcontext32(struct pt_regs *regs, struct sigcontext32 *sc)
 	err |= __get_user(regs->cp0_epc, &sc->sc_pc);
 	err |= __get_user(regs->hi, &sc->sc_mdhi);
 	err |= __get_user(regs->lo, &sc->sc_mdlo);
+	if (cpu_has_dsp) {
+		err |= __get_user(treg, &sc->sc_hi1); mthi1(treg);
+		err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
+		err |= __get_user(treg, &sc->sc_hi2); mthi2(treg);
+		err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
+		err |= __get_user(treg, &sc->sc_hi3); mthi3(treg);
+		err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
+		err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
+	}
 
 #define restore_gp_reg(i) do {						\
 	err |= __get_user(regs->regs[i], &sc->sc_regs[i]);		\
@@ -562,8 +573,15 @@ static inline int setup_sigcontext32(struct pt_regs *regs,
 
 	err |= __put_user(regs->hi, &sc->sc_mdhi);
 	err |= __put_user(regs->lo, &sc->sc_mdlo);
-	err |= __put_user(regs->cp0_cause, &sc->sc_cause);
-	err |= __put_user(regs->cp0_badvaddr, &sc->sc_badvaddr);
+	if (cpu_has_dsp) {
+		err |= __put_user(rddsp(DSP_MASK), &sc->sc_hi1);
+		err |= __put_user(mfhi1(), &sc->sc_hi1);
+		err |= __put_user(mflo1(), &sc->sc_lo1);
+		err |= __put_user(mfhi2(), &sc->sc_hi2);
+		err |= __put_user(mflo2(), &sc->sc_lo2);
+		err |= __put_user(mfhi3(), &sc->sc_hi3);
+		err |= __put_user(mflo3(), &sc->sc_lo3);
+	}
 
 	err |= __put_user(!!used_math(), &sc->sc_used_math);
 
@@ -613,7 +631,7 @@ static inline void *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
 	return (void *)((sp - frame_size) & ALMASK);
 }
 
-static inline void setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
+void setup_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
 			       int signr, sigset_t *set)
 {
 	struct sigframe *frame;
@@ -666,9 +684,7 @@ give_sigsegv:
 	force_sigsegv(signr, current);
 }
 
-static inline void setup_rt_frame(struct k_sigaction * ka,
-				  struct pt_regs *regs, int signr,
-				  sigset_t *set, siginfo_t *info)
+void setup_rt_frame_32(struct k_sigaction * ka, struct pt_regs *regs, int signr,	sigset_t *set, siginfo_t *info)
 {
 	struct rt_sigframe32 *frame;
 	int err = 0;
@@ -759,9 +775,9 @@ static inline void handle_signal(unsigned long sig, siginfo_t *info,
 	regs->regs[0] = 0;		/* Don't deal with this again.  */
 
 	if (ka->sa.sa_flags & SA_SIGINFO)
-		setup_rt_frame(ka, regs, sig, oldset, info);
+		current->thread.abi->setup_rt_frame(ka, regs, sig, oldset, info);
 	else
-		setup_frame(ka, regs, sig, oldset);
+		current->thread.abi->setup_frame(ka, regs, sig, oldset);
 
 	spin_lock_irq(&current->sighand->siglock);
 	sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index b3ecd02..9419a35 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -25,6 +25,7 @@
 #include <asm/branch.h>
 #include <asm/break.h>
 #include <asm/cpu.h>
+#include <asm/dsp.h>
 #include <asm/fpu.h>
 #include <asm/module.h>
 #include <asm/pgtable.h>
@@ -54,6 +55,7 @@ extern asmlinkage void handle_tr(void);
 extern asmlinkage void handle_fpe(void);
 extern asmlinkage void handle_mdmx(void);
 extern asmlinkage void handle_watch(void);
+extern asmlinkage void handle_dsp(void);
 extern asmlinkage void handle_mcheck(void);
 extern asmlinkage void handle_reserved(void);
 
@@ -775,6 +777,14 @@ asmlinkage void do_mcheck(struct pt_regs *regs)
 	      (regs->cp0_status & ST0_TS) ? "" : "not ");
 }
 
+asmlinkage void do_dsp(struct pt_regs *regs)
+{
+	if (cpu_has_dsp)
+		panic("Unexpected DSP exception\n");
+
+	force_sig(SIGILL, current);
+}
+
 asmlinkage void do_reserved(struct pt_regs *regs)
 {
 	/*
@@ -984,9 +994,12 @@ void __init per_cpu_trap_init(void)
 #endif
 	if (current_cpu_data.isa_level == MIPS_CPU_ISA_IV)
 		status_set |= ST0_XX;
-	change_c0_status(ST0_CU|ST0_FR|ST0_BEV|ST0_TS|ST0_KX|ST0_SX|ST0_UX,
+	change_c0_status(ST0_CU|ST0_MX|ST0_FR|ST0_BEV|ST0_TS|ST0_KX|ST0_SX|ST0_UX,
 			 status_set);
 
+	if (cpu_has_dsp)
+		set_c0_status(ST0_MX);
+
 	/*
 	 * Some MIPS CPUs have a dedicated interrupt vector which reduces the
 	 * interrupt processing overhead.  Use it where available.
@@ -1078,21 +1091,6 @@ void __init trap_init(void)
 	set_except_vector(11, handle_cpu);
 	set_except_vector(12, handle_ov);
 	set_except_vector(13, handle_tr);
-	set_except_vector(22, handle_mdmx);
-
-	if (cpu_has_fpu && !cpu_has_nofpuex)
-		set_except_vector(15, handle_fpe);
-
-	if (cpu_has_mcheck)
-		set_except_vector(24, handle_mcheck);
-
-	if (cpu_has_vce)
-		/* Special exception: R4[04]00 uses also the divec space. */
-		memcpy((void *)(CAC_BASE + 0x180), &except_vec3_r4000, 0x100);
-	else if (cpu_has_4kex)
-		memcpy((void *)(CAC_BASE + 0x180), &except_vec3_generic, 0x80);
-	else
-		memcpy((void *)(CAC_BASE + 0x080), &except_vec3_generic, 0x80);
 
 	if (current_cpu_data.cputype == CPU_R6000 ||
 	    current_cpu_data.cputype == CPU_R6000A) {
@@ -1108,6 +1106,25 @@ void __init trap_init(void)
 		//set_except_vector(15, handle_ndc);
 	}
 
+	if (cpu_has_fpu && !cpu_has_nofpuex)
+		set_except_vector(15, handle_fpe);
+
+	set_except_vector(22, handle_mdmx);
+
+	if (cpu_has_mcheck)
+		set_except_vector(24, handle_mcheck);
+
+	if (cpu_has_dsp)
+		set_except_vector(26, handle_dsp);
+
+	if (cpu_has_vce)
+		/* Special exception: R4[04]00 uses also the divec space. */
+		memcpy((void *)(CAC_BASE + 0x180), &except_vec3_r4000, 0x100);
+	else if (cpu_has_4kex)
+		memcpy((void *)(CAC_BASE + 0x180), &except_vec3_generic, 0x80);
+	else
+		memcpy((void *)(CAC_BASE + 0x080), &except_vec3_generic, 0x80);
+
 	signal_init();
 #ifdef CONFIG_MIPS32_COMPAT
 	signal32_init();