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-rw-r--r--arch/mips/kernel/asm-offsets.c1
-rw-r--r--arch/mips/kernel/i8259.c4
-rw-r--r--arch/mips/kernel/kspd.c5
-rw-r--r--arch/mips/kernel/r2300_switch.S10
-rw-r--r--arch/mips/kernel/r4k_switch.S10
-rw-r--r--arch/mips/kernel/rtlx.c7
-rw-r--r--arch/mips/kernel/signal-common.h9
-rw-r--r--arch/mips/kernel/signal.c52
-rw-r--r--arch/mips/kernel/signal32.c52
-rw-r--r--arch/mips/kernel/traps.c25
10 files changed, 115 insertions, 60 deletions
diff --git a/arch/mips/kernel/asm-offsets.c b/arch/mips/kernel/asm-offsets.c
index 222de465db7..761a779d5c4 100644
--- a/arch/mips/kernel/asm-offsets.c
+++ b/arch/mips/kernel/asm-offsets.c
@@ -102,7 +102,6 @@ void output_thread_info_defines(void)
offset("#define TI_ADDR_LIMIT ", struct thread_info, addr_limit);
offset("#define TI_RESTART_BLOCK ", struct thread_info, restart_block);
offset("#define TI_REGS ", struct thread_info, regs);
- constant("#define _THREAD_SIZE_ORDER ", THREAD_SIZE_ORDER);
constant("#define _THREAD_SIZE ", THREAD_SIZE);
constant("#define _THREAD_MASK ", THREAD_MASK);
linefeed;
diff --git a/arch/mips/kernel/i8259.c b/arch/mips/kernel/i8259.c
index 9c79703979b..2345160e63f 100644
--- a/arch/mips/kernel/i8259.c
+++ b/arch/mips/kernel/i8259.c
@@ -328,8 +328,8 @@ void __init init_i8259_irqs (void)
{
int i;
- request_resource(&ioport_resource, &pic1_io_resource);
- request_resource(&ioport_resource, &pic2_io_resource);
+ insert_resource(&ioport_resource, &pic1_io_resource);
+ insert_resource(&ioport_resource, &pic2_io_resource);
init_8259A(0);
diff --git a/arch/mips/kernel/kspd.c b/arch/mips/kernel/kspd.c
index 29eadd404fa..c6580018c94 100644
--- a/arch/mips/kernel/kspd.c
+++ b/arch/mips/kernel/kspd.c
@@ -17,6 +17,7 @@
*/
#include <linux/kernel.h>
#include <linux/module.h>
+#include <linux/sched.h>
#include <linux/unistd.h>
#include <linux/file.h>
#include <linux/fs.h>
@@ -198,7 +199,6 @@ void sp_work_handle_request(void)
int cmd;
char *vcwd;
- mm_segment_t old_fs;
int size;
ret.retval = -1;
@@ -241,8 +241,6 @@ void sp_work_handle_request(void)
if ((ret.retval = sp_syscall(__NR_gettimeofday, (int)&tv,
(int)&tz, 0,0)) == 0)
ret.retval = tv.tv_sec;
-
- ret.errno = errno;
break;
case MTSP_SYSCALL_EXIT:
@@ -279,7 +277,6 @@ void sp_work_handle_request(void)
if (cmd >= 0) {
ret.retval = sp_syscall(cmd, generic.arg0, generic.arg1,
generic.arg2, generic.arg3);
- ret.errno = errno;
} else
printk(KERN_WARNING
"KSPD: Unknown SP syscall number %d\n", sc.cmd);
diff --git a/arch/mips/kernel/r2300_switch.S b/arch/mips/kernel/r2300_switch.S
index 28c2e2e6af7..656bde2e11b 100644
--- a/arch/mips/kernel/r2300_switch.S
+++ b/arch/mips/kernel/r2300_switch.S
@@ -49,7 +49,8 @@ LEAF(resume)
#ifndef CONFIG_CPU_HAS_LLSC
sw zero, ll_bit
#endif
- mfc0 t2, CP0_STATUS
+ mfc0 t1, CP0_STATUS
+ sw t1, THREAD_STATUS(a0)
cpu_save_nonscratch a0
sw ra, THREAD_REG31(a0)
@@ -59,8 +60,8 @@ LEAF(resume)
lw t3, TASK_THREAD_INFO(a0)
lw t0, TI_FLAGS(t3)
li t1, _TIF_USEDFPU
- and t1, t0
- beqz t1, 1f
+ and t2, t0, t1
+ beqz t2, 1f
nor t1, zero, t1
and t0, t0, t1
@@ -73,13 +74,10 @@ LEAF(resume)
li t1, ~ST0_CU1
and t0, t0, t1
sw t0, ST_OFF(t3)
- /* clear thread_struct CU1 bit */
- and t2, t1
fpu_save_single a0, t0 # clobbers t0
1:
- sw t2, THREAD_STATUS(a0)
/*
* The order of restoring the registers takes care of the race
* updating $28, $29 and kernelsp without disabling ints.
diff --git a/arch/mips/kernel/r4k_switch.S b/arch/mips/kernel/r4k_switch.S
index c7698fd9955..cc566cf1224 100644
--- a/arch/mips/kernel/r4k_switch.S
+++ b/arch/mips/kernel/r4k_switch.S
@@ -48,7 +48,8 @@
#ifndef CONFIG_CPU_HAS_LLSC
sw zero, ll_bit
#endif
- mfc0 t2, CP0_STATUS
+ mfc0 t1, CP0_STATUS
+ LONG_S t1, THREAD_STATUS(a0)
cpu_save_nonscratch a0
LONG_S ra, THREAD_REG31(a0)
@@ -58,8 +59,8 @@
PTR_L t3, TASK_THREAD_INFO(a0)
LONG_L t0, TI_FLAGS(t3)
li t1, _TIF_USEDFPU
- and t1, t0
- beqz t1, 1f
+ and t2, t0, t1
+ beqz t2, 1f
nor t1, zero, t1
and t0, t0, t1
@@ -72,13 +73,10 @@
li t1, ~ST0_CU1
and t0, t0, t1
LONG_S t0, ST_OFF(t3)
- /* clear thread_struct CU1 bit */
- and t2, t1
fpu_save_double a0 t0 t1 # c0_status passed in t0
# clobbers t1
1:
- LONG_S t2, THREAD_STATUS(a0)
/*
* The order of restoring the registers takes care of the race
diff --git a/arch/mips/kernel/rtlx.c b/arch/mips/kernel/rtlx.c
index e6e3047151a..bfc8ca168f8 100644
--- a/arch/mips/kernel/rtlx.c
+++ b/arch/mips/kernel/rtlx.c
@@ -289,7 +289,7 @@ unsigned int rtlx_write_poll(int index)
return write_spacefree(chan->rt_read, chan->rt_write, chan->buffer_size);
}
-ssize_t rtlx_read(int index, void __user *buff, size_t count, int user)
+ssize_t rtlx_read(int index, void __user *buff, size_t count)
{
size_t lx_write, fl = 0L;
struct rtlx_channel *lx;
@@ -331,9 +331,10 @@ out:
return count;
}
-ssize_t rtlx_write(int index, const void __user *buffer, size_t count, int user)
+ssize_t rtlx_write(int index, const void __user *buffer, size_t count)
{
struct rtlx_channel *rt;
+ unsigned long failed;
size_t rt_read;
size_t fl;
@@ -363,7 +364,7 @@ ssize_t rtlx_write(int index, const void __user *buffer, size_t count, int user)
}
out:
- count -= cailed;
+ count -= failed;
smp_wmb();
rt->rt_write = (rt->rt_write + count) % rt->buffer_size;
diff --git a/arch/mips/kernel/signal-common.h b/arch/mips/kernel/signal-common.h
index 297dfcb9752..c0faabd5201 100644
--- a/arch/mips/kernel/signal-common.h
+++ b/arch/mips/kernel/signal-common.h
@@ -34,4 +34,13 @@ extern int install_sigtramp(unsigned int __user *tramp, unsigned int syscall);
/* Check and clear pending FPU exceptions in saved CSR */
extern int fpcsr_pending(unsigned int __user *fpcsr);
+/* Make sure we will not lose FPU ownership */
+#ifdef CONFIG_PREEMPT
+#define lock_fpu_owner() preempt_disable()
+#define unlock_fpu_owner() preempt_enable()
+#else
+#define lock_fpu_owner() pagefault_disable()
+#define unlock_fpu_owner() pagefault_enable()
+#endif
+
#endif /* __SIGNAL_COMMON_H */
diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c
index 8c3c5a5789b..07d67309451 100644
--- a/arch/mips/kernel/signal.c
+++ b/arch/mips/kernel/signal.c
@@ -20,6 +20,7 @@
#include <linux/ptrace.h>
#include <linux/unistd.h>
#include <linux/compiler.h>
+#include <linux/uaccess.h>
#include <asm/abi.h>
#include <asm/asm.h>
@@ -27,7 +28,6 @@
#include <asm/cacheflush.h>
#include <asm/fpu.h>
#include <asm/sim.h>
-#include <asm/uaccess.h>
#include <asm/ucontext.h>
#include <asm/cpu-features.h>
#include <asm/war.h>
@@ -78,6 +78,46 @@ struct rt_sigframe {
/*
* Helper routines
*/
+static int protected_save_fp_context(struct sigcontext __user *sc)
+{
+ int err;
+ while (1) {
+ lock_fpu_owner();
+ own_fpu_inatomic(1);
+ err = save_fp_context(sc); /* this might fail */
+ unlock_fpu_owner();
+ if (likely(!err))
+ break;
+ /* touch the sigcontext and try again */
+ err = __put_user(0, &sc->sc_fpregs[0]) |
+ __put_user(0, &sc->sc_fpregs[31]) |
+ __put_user(0, &sc->sc_fpc_csr);
+ if (err)
+ break; /* really bad sigcontext */
+ }
+ return err;
+}
+
+static int protected_restore_fp_context(struct sigcontext __user *sc)
+{
+ int err, tmp;
+ while (1) {
+ lock_fpu_owner();
+ own_fpu_inatomic(0);
+ err = restore_fp_context(sc); /* this might fail */
+ unlock_fpu_owner();
+ if (likely(!err))
+ break;
+ /* touch the sigcontext and try again */
+ err = __get_user(tmp, &sc->sc_fpregs[0]) |
+ __get_user(tmp, &sc->sc_fpregs[31]) |
+ __get_user(tmp, &sc->sc_fpc_csr);
+ if (err)
+ break; /* really bad sigcontext */
+ }
+ return err;
+}
+
int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
{
int err = 0;
@@ -113,10 +153,7 @@ int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
* Save FPU state to signal context. Signal handler
* will "inherit" current FPU state.
*/
- own_fpu(1);
- enable_fp_in_kernel();
- err |= save_fp_context(sc);
- disable_fp_in_kernel();
+ err |= protected_save_fp_context(sc);
}
return err;
}
@@ -148,7 +185,7 @@ check_and_restore_fp_context(struct sigcontext __user *sc)
err = sig = fpcsr_pending(&sc->sc_fpc_csr);
if (err > 0)
err = 0;
- err |= restore_fp_context(sc);
+ err |= protected_restore_fp_context(sc);
return err ?: sig;
}
@@ -187,11 +224,8 @@ int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
if (used_math) {
/* restore fpu context if we have used it before */
- own_fpu(0);
- enable_fp_in_kernel();
if (!err)
err = check_and_restore_fp_context(sc);
- disable_fp_in_kernel();
} else {
/* signal handler may have used FPU. Give it up. */
lose_fpu(0);
diff --git a/arch/mips/kernel/signal32.c b/arch/mips/kernel/signal32.c
index 151fd2f0893..b9a014411f8 100644
--- a/arch/mips/kernel/signal32.c
+++ b/arch/mips/kernel/signal32.c
@@ -22,6 +22,7 @@
#include <linux/compat.h>
#include <linux/suspend.h>
#include <linux/compiler.h>
+#include <linux/uaccess.h>
#include <asm/abi.h>
#include <asm/asm.h>
@@ -29,7 +30,6 @@
#include <linux/bitops.h>
#include <asm/cacheflush.h>
#include <asm/sim.h>
-#include <asm/uaccess.h>
#include <asm/ucontext.h>
#include <asm/system.h>
#include <asm/fpu.h>
@@ -176,6 +176,46 @@ struct rt_sigframe32 {
/*
* sigcontext handlers
*/
+static int protected_save_fp_context32(struct sigcontext32 __user *sc)
+{
+ int err;
+ while (1) {
+ lock_fpu_owner();
+ own_fpu_inatomic(1);
+ err = save_fp_context32(sc); /* this might fail */
+ unlock_fpu_owner();
+ if (likely(!err))
+ break;
+ /* touch the sigcontext and try again */
+ err = __put_user(0, &sc->sc_fpregs[0]) |
+ __put_user(0, &sc->sc_fpregs[31]) |
+ __put_user(0, &sc->sc_fpc_csr);
+ if (err)
+ break; /* really bad sigcontext */
+ }
+ return err;
+}
+
+static int protected_restore_fp_context32(struct sigcontext32 __user *sc)
+{
+ int err, tmp;
+ while (1) {
+ lock_fpu_owner();
+ own_fpu_inatomic(0);
+ err = restore_fp_context32(sc); /* this might fail */
+ unlock_fpu_owner();
+ if (likely(!err))
+ break;
+ /* touch the sigcontext and try again */
+ err = __get_user(tmp, &sc->sc_fpregs[0]) |
+ __get_user(tmp, &sc->sc_fpregs[31]) |
+ __get_user(tmp, &sc->sc_fpc_csr);
+ if (err)
+ break; /* really bad sigcontext */
+ }
+ return err;
+}
+
static int setup_sigcontext32(struct pt_regs *regs,
struct sigcontext32 __user *sc)
{
@@ -209,10 +249,7 @@ static int setup_sigcontext32(struct pt_regs *regs,
* Save FPU state to signal context. Signal handler
* will "inherit" current FPU state.
*/
- own_fpu(1);
- enable_fp_in_kernel();
- err |= save_fp_context32(sc);
- disable_fp_in_kernel();
+ err |= protected_save_fp_context32(sc);
}
return err;
}
@@ -225,7 +262,7 @@ check_and_restore_fp_context32(struct sigcontext32 __user *sc)
err = sig = fpcsr_pending(&sc->sc_fpc_csr);
if (err > 0)
err = 0;
- err |= restore_fp_context32(sc);
+ err |= protected_restore_fp_context32(sc);
return err ?: sig;
}
@@ -261,11 +298,8 @@ static int restore_sigcontext32(struct pt_regs *regs,
if (used_math) {
/* restore fpu context if we have used it before */
- own_fpu(0);
- enable_fp_in_kernel();
if (!err)
err = check_and_restore_fp_context32(sc);
- disable_fp_in_kernel();
} else {
/* signal handler may have used FPU. Give it up. */
lose_fpu(0);
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 7d76a85422b..493cb29b8a4 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -650,7 +650,7 @@ asmlinkage void do_bp(struct pt_regs *regs)
unsigned int opcode, bcode;
siginfo_t info;
- if (get_user(opcode, (unsigned int __user *) exception_epc(regs)))
+ if (__get_user(opcode, (unsigned int __user *) exception_epc(regs)))
goto out_sigsegv;
/*
@@ -700,7 +700,7 @@ asmlinkage void do_tr(struct pt_regs *regs)
unsigned int opcode, tcode = 0;
siginfo_t info;
- if (get_user(opcode, (unsigned int __user *) exception_epc(regs)))
+ if (__get_user(opcode, (unsigned int __user *) exception_epc(regs)))
goto out_sigsegv;
/* Immediate versions don't provide a code. */
@@ -757,11 +757,12 @@ asmlinkage void do_cpu(struct pt_regs *regs)
{
unsigned int cpid;
+ die_if_kernel("do_cpu invoked from kernel context!", regs);
+
cpid = (regs->cp0_cause >> CAUSEB_CE) & 3;
switch (cpid) {
case 0:
- die_if_kernel("do_cpu invoked from kernel context!", regs);
if (!cpu_has_llsc)
if (!simulate_llsc(regs))
return;
@@ -772,9 +773,6 @@ asmlinkage void do_cpu(struct pt_regs *regs)
break;
case 1:
- if (!test_thread_flag(TIF_ALLOW_FP_IN_KERNEL))
- die_if_kernel("do_cpu invoked from kernel context!",
- regs);
if (used_math()) /* Using the FPU again. */
own_fpu(1);
else { /* First time FPU user. */
@@ -782,19 +780,7 @@ asmlinkage void do_cpu(struct pt_regs *regs)
set_used_math();
}
- if (raw_cpu_has_fpu) {
- if (test_thread_flag(TIF_ALLOW_FP_IN_KERNEL)) {
- local_irq_disable();
- if (cpu_has_fpu)
- regs->cp0_status |= ST0_CU1;
- /*
- * We must return without enabling
- * interrupts to ensure keep FPU
- * ownership until resume.
- */
- return;
- }
- } else {
+ if (!raw_cpu_has_fpu) {
int sig;
sig = fpu_emulator_cop1Handler(regs,
&current->thread.fpu, 0);
@@ -836,7 +822,6 @@ asmlinkage void do_cpu(struct pt_regs *regs)
case 2:
case 3:
- die_if_kernel("do_cpu invoked from kernel context!", regs);
break;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-12 20:55:28 +0000