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-rw-r--r--arch/csky/kernel/entry.S28
-rw-r--r--arch/csky/kernel/process.c10
-rw-r--r--arch/csky/kernel/ptrace.c37
-rw-r--r--arch/csky/kernel/smp.c62
-rw-r--r--arch/csky/kernel/traps.c223
5 files changed, 238 insertions, 122 deletions
diff --git a/arch/csky/kernel/entry.S b/arch/csky/kernel/entry.S
index f13800383a19..5a5cabd076e1 100644
--- a/arch/csky/kernel/entry.S
+++ b/arch/csky/kernel/entry.S
@@ -23,6 +23,24 @@
#endif
.endm
+.macro context_tracking
+#ifdef CONFIG_CONTEXT_TRACKING
+ mfcr a0, epsr
+ btsti a0, 31
+ bt 1f
+ jbsr context_tracking_user_exit
+ ldw a0, (sp, LSAVE_A0)
+ ldw a1, (sp, LSAVE_A1)
+ ldw a2, (sp, LSAVE_A2)
+ ldw a3, (sp, LSAVE_A3)
+#if defined(__CSKYABIV1__)
+ ldw r6, (sp, LSAVE_A4)
+ ldw r7, (sp, LSAVE_A5)
+#endif
+1:
+#endif
+.endm
+
.macro tlbop_begin name, val0, val1, val2
ENTRY(csky_\name)
mtcr a3, ss2
@@ -103,6 +121,7 @@ ENTRY(csky_\name)
.endm
.macro tlbop_end is_write
zero_fp
+ context_tracking
RD_MEH a2
psrset ee, ie
mov a0, sp
@@ -128,6 +147,7 @@ tlbop_end 1
ENTRY(csky_systemcall)
SAVE_ALL TRAP0_SIZE
zero_fp
+ context_tracking
psrset ee, ie
lrw r9, __NR_syscalls
@@ -168,6 +188,8 @@ ENTRY(csky_systemcall)
csky_syscall_trace:
mov a0, sp /* sp = pt_regs pointer */
jbsr syscall_trace_enter
+ cmpnei a0, 0
+ bt 1f
/* Prepare args before do system call */
ldw a0, (sp, LSAVE_A0)
ldw a1, (sp, LSAVE_A1)
@@ -188,6 +210,7 @@ csky_syscall_trace:
#endif
stw a0, (sp, LSAVE_A0) /* Save return value */
+1:
#ifdef CONFIG_DEBUG_RSEQ
mov a0, sp
jbsr rseq_syscall
@@ -234,6 +257,9 @@ ret_from_exception:
and r10, r9
cmpnei r10, 0
bt exit_work
+#ifdef CONFIG_CONTEXT_TRACKING
+ jbsr context_tracking_user_enter
+#endif
1:
#ifdef CONFIG_PREEMPTION
mov r9, sp
@@ -274,6 +300,7 @@ work_resched:
ENTRY(csky_trap)
SAVE_ALL 0
zero_fp
+ context_tracking
psrset ee
mov a0, sp /* Push Stack pointer arg */
jbsr trap_c /* Call C-level trap handler */
@@ -308,6 +335,7 @@ ENTRY(csky_get_tls)
ENTRY(csky_irq)
SAVE_ALL 0
zero_fp
+ context_tracking
psrset ee
#ifdef CONFIG_TRACE_IRQFLAGS
diff --git a/arch/csky/kernel/process.c b/arch/csky/kernel/process.c
index 28cfeaaf902a..f730869e21ee 100644
--- a/arch/csky/kernel/process.c
+++ b/arch/csky/kernel/process.c
@@ -30,16 +30,6 @@ asmlinkage void ret_from_kernel_thread(void);
*/
void flush_thread(void){}
-/*
- * Return saved PC from a blocked thread
- */
-unsigned long thread_saved_pc(struct task_struct *tsk)
-{
- struct switch_stack *sw = (struct switch_stack *)tsk->thread.sp;
-
- return sw->r15;
-}
-
int copy_thread(unsigned long clone_flags,
unsigned long usp,
unsigned long kthread_arg,
diff --git a/arch/csky/kernel/ptrace.c b/arch/csky/kernel/ptrace.c
index 944ca2fdcdd9..b06612c408c4 100644
--- a/arch/csky/kernel/ptrace.c
+++ b/arch/csky/kernel/ptrace.c
@@ -320,16 +320,20 @@ long arch_ptrace(struct task_struct *child, long request,
return ret;
}
-asmlinkage void syscall_trace_enter(struct pt_regs *regs)
+asmlinkage int syscall_trace_enter(struct pt_regs *regs)
{
if (test_thread_flag(TIF_SYSCALL_TRACE))
if (tracehook_report_syscall_entry(regs))
- syscall_set_nr(current, regs, -1);
+ return -1;
+
+ if (secure_computing() == -1)
+ return -1;
if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
trace_sys_enter(regs, syscall_get_nr(current, regs));
audit_syscall_entry(regs_syscallid(regs), regs->a0, regs->a1, regs->a2, regs->a3);
+ return 0;
}
asmlinkage void syscall_trace_exit(struct pt_regs *regs)
@@ -343,13 +347,8 @@ asmlinkage void syscall_trace_exit(struct pt_regs *regs)
trace_sys_exit(regs, syscall_get_return_value(current, regs));
}
-extern void show_stack(struct task_struct *task, unsigned long *stack, const char *loglvl);
void show_regs(struct pt_regs *fp)
{
- unsigned long *sp;
- unsigned char *tp;
- int i;
-
pr_info("\nCURRENT PROCESS:\n\n");
pr_info("COMM=%s PID=%d\n", current->comm, current->pid);
@@ -396,29 +395,9 @@ void show_regs(struct pt_regs *fp)
fp->regs[0], fp->regs[1], fp->regs[2], fp->regs[3]);
pr_info("r10: 0x%08lx r11: 0x%08lx r12: 0x%08lx r13: 0x%08lx\n",
fp->regs[4], fp->regs[5], fp->regs[6], fp->regs[7]);
- pr_info("r14: 0x%08lx r1: 0x%08lx r15: 0x%08lx\n",
- fp->regs[8], fp->regs[9], fp->lr);
+ pr_info("r14: 0x%08lx r1: 0x%08lx\n",
+ fp->regs[8], fp->regs[9]);
#endif
- pr_info("\nCODE:");
- tp = ((unsigned char *) fp->pc) - 0x20;
- tp += ((int)tp % 4) ? 2 : 0;
- for (sp = (unsigned long *) tp, i = 0; (i < 0x40); i += 4) {
- if ((i % 0x10) == 0)
- pr_cont("\n%08x: ", (int) (tp + i));
- pr_cont("%08x ", (int) *sp++);
- }
- pr_cont("\n");
-
- pr_info("\nKERNEL STACK:");
- tp = ((unsigned char *) fp) - 0x40;
- for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) {
- if ((i % 0x10) == 0)
- pr_cont("\n%08x: ", (int) (tp + i));
- pr_cont("%08x ", (int) *sp++);
- }
- pr_cont("\n");
-
- show_stack(NULL, (unsigned long *)fp->regs[4], KERN_INFO);
return;
}
diff --git a/arch/csky/kernel/smp.c b/arch/csky/kernel/smp.c
index b5c5bc3afeb5..e7425e6b0419 100644
--- a/arch/csky/kernel/smp.c
+++ b/arch/csky/kernel/smp.c
@@ -12,8 +12,10 @@
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/irq.h>
+#include <linux/irq_work.h>
#include <linux/irqdomain.h>
#include <linux/of.h>
+#include <linux/seq_file.h>
#include <linux/sched/task_stack.h>
#include <linux/sched/mm.h>
#include <linux/sched/hotplug.h>
@@ -26,20 +28,24 @@
#include <abi/fpu.h>
#endif
-struct ipi_data_struct {
- unsigned long bits ____cacheline_aligned;
-};
-static DEFINE_PER_CPU(struct ipi_data_struct, ipi_data);
-
enum ipi_message_type {
IPI_EMPTY,
IPI_RESCHEDULE,
IPI_CALL_FUNC,
+ IPI_IRQ_WORK,
IPI_MAX
};
+struct ipi_data_struct {
+ unsigned long bits ____cacheline_aligned;
+ unsigned long stats[IPI_MAX] ____cacheline_aligned;
+};
+static DEFINE_PER_CPU(struct ipi_data_struct, ipi_data);
+
static irqreturn_t handle_ipi(int irq, void *dev)
{
+ unsigned long *stats = this_cpu_ptr(&ipi_data)->stats;
+
while (true) {
unsigned long ops;
@@ -47,11 +53,20 @@ static irqreturn_t handle_ipi(int irq, void *dev)
if (ops == 0)
return IRQ_HANDLED;
- if (ops & (1 << IPI_RESCHEDULE))
+ if (ops & (1 << IPI_RESCHEDULE)) {
+ stats[IPI_RESCHEDULE]++;
scheduler_ipi();
+ }
- if (ops & (1 << IPI_CALL_FUNC))
+ if (ops & (1 << IPI_CALL_FUNC)) {
+ stats[IPI_CALL_FUNC]++;
generic_smp_call_function_interrupt();
+ }
+
+ if (ops & (1 << IPI_IRQ_WORK)) {
+ stats[IPI_IRQ_WORK]++;
+ irq_work_run();
+ }
BUG_ON((ops >> IPI_MAX) != 0);
}
@@ -83,6 +98,29 @@ send_ipi_message(const struct cpumask *to_whom, enum ipi_message_type operation)
send_arch_ipi(to_whom);
}
+static const char * const ipi_names[] = {
+ [IPI_EMPTY] = "Empty interrupts",
+ [IPI_RESCHEDULE] = "Rescheduling interrupts",
+ [IPI_CALL_FUNC] = "Function call interrupts",
+ [IPI_IRQ_WORK] = "Irq work interrupts",
+};
+
+int arch_show_interrupts(struct seq_file *p, int prec)
+{
+ unsigned int cpu, i;
+
+ for (i = 0; i < IPI_MAX; i++) {
+ seq_printf(p, "%*s%u:%s", prec - 1, "IPI", i,
+ prec >= 4 ? " " : "");
+ for_each_online_cpu(cpu)
+ seq_printf(p, "%10lu ",
+ per_cpu_ptr(&ipi_data, cpu)->stats[i]);
+ seq_printf(p, " %s\n", ipi_names[i]);
+ }
+
+ return 0;
+}
+
void arch_send_call_function_ipi_mask(struct cpumask *mask)
{
send_ipi_message(mask, IPI_CALL_FUNC);
@@ -108,6 +146,13 @@ void smp_send_reschedule(int cpu)
send_ipi_message(cpumask_of(cpu), IPI_RESCHEDULE);
}
+#ifdef CONFIG_IRQ_WORK
+void arch_irq_work_raise(void)
+{
+ send_ipi_message(cpumask_of(smp_processor_id()), IPI_IRQ_WORK);
+}
+#endif
+
void __init smp_prepare_boot_cpu(void)
{
}
@@ -156,6 +201,7 @@ void __init setup_smp(void)
extern void _start_smp_secondary(void);
volatile unsigned int secondary_hint;
+volatile unsigned int secondary_hint2;
volatile unsigned int secondary_ccr;
volatile unsigned int secondary_stack;
@@ -168,6 +214,7 @@ int __cpu_up(unsigned int cpu, struct task_struct *tidle)
secondary_stack =
(unsigned int) task_stack_page(tidle) + THREAD_SIZE - 8;
secondary_hint = mfcr("cr31");
+ secondary_hint2 = mfcr("cr<21, 1>");
secondary_ccr = mfcr("cr18");
secondary_msa1 = read_mmu_msa1();
@@ -209,6 +256,7 @@ void csky_start_secondary(void)
unsigned int cpu = smp_processor_id();
mtcr("cr31", secondary_hint);
+ mtcr("cr<21, 1>", secondary_hint2);
mtcr("cr18", secondary_ccr);
mtcr("vbr", vec_base);
diff --git a/arch/csky/kernel/traps.c b/arch/csky/kernel/traps.c
index fcc3a69831ad..959a917c989d 100644
--- a/arch/csky/kernel/traps.c
+++ b/arch/csky/kernel/traps.c
@@ -15,6 +15,8 @@
#include <linux/rtc.h>
#include <linux/uaccess.h>
#include <linux/kprobes.h>
+#include <linux/kdebug.h>
+#include <linux/sched/debug.h>
#include <asm/setup.h>
#include <asm/traps.h>
@@ -27,6 +29,8 @@
#include <abi/fpu.h>
#endif
+int show_unhandled_signals = 1;
+
/* Defined in entry.S */
asmlinkage void csky_trap(void);
@@ -77,117 +81,184 @@ void __init trap_init(void)
#endif
}
-void die_if_kernel(char *str, struct pt_regs *regs, int nr)
+static DEFINE_SPINLOCK(die_lock);
+
+void die(struct pt_regs *regs, const char *str)
{
- if (user_mode(regs))
- return;
+ static int die_counter;
+ int ret;
+ oops_enter();
+
+ spin_lock_irq(&die_lock);
console_verbose();
- pr_err("%s: %08x\n", str, nr);
+ bust_spinlocks(1);
+
+ pr_emerg("%s [#%d]\n", str, ++die_counter);
+ print_modules();
show_regs(regs);
+ show_stack(current, (unsigned long *)regs->regs[4], KERN_INFO);
+
+ ret = notify_die(DIE_OOPS, str, regs, 0, trap_no(regs), SIGSEGV);
+
+ bust_spinlocks(0);
add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
- do_exit(SIGSEGV);
+ spin_unlock_irq(&die_lock);
+ oops_exit();
+
+ if (in_interrupt())
+ panic("Fatal exception in interrupt");
+ if (panic_on_oops)
+ panic("Fatal exception");
+ if (ret != NOTIFY_STOP)
+ do_exit(SIGSEGV);
}
-void buserr(struct pt_regs *regs)
+void do_trap(struct pt_regs *regs, int signo, int code, unsigned long addr)
{
-#ifdef CONFIG_CPU_CK810
- static unsigned long prev_pc;
+ struct task_struct *tsk = current;
- if ((regs->pc == prev_pc) && prev_pc != 0) {
- prev_pc = 0;
- } else {
- prev_pc = regs->pc;
- return;
+ if (show_unhandled_signals && unhandled_signal(tsk, signo)
+ && printk_ratelimit()) {
+ pr_info("%s[%d]: unhandled signal %d code 0x%x at 0x%08lx",
+ tsk->comm, task_pid_nr(tsk), signo, code, addr);
+ print_vma_addr(KERN_CONT " in ", instruction_pointer(regs));
+ pr_cont("\n");
+ show_regs(regs);
}
-#endif
- die_if_kernel("Kernel mode BUS error", regs, 0);
+ force_sig_fault(signo, code, (void __user *)addr);
+}
- pr_err("User mode Bus Error\n");
- show_regs(regs);
+static void do_trap_error(struct pt_regs *regs, int signo, int code,
+ unsigned long addr, const char *str)
+{
+ current->thread.trap_no = trap_no(regs);
- force_sig_fault(SIGSEGV, 0, (void __user *)regs->pc);
+ if (user_mode(regs)) {
+ do_trap(regs, signo, code, addr);
+ } else {
+ if (!fixup_exception(regs))
+ die(regs, str);
+ }
}
-asmlinkage void trap_c(struct pt_regs *regs)
-{
- int sig;
- unsigned long vector;
- siginfo_t info;
- struct task_struct *tsk = current;
+#define DO_ERROR_INFO(name, signo, code, str) \
+asmlinkage __visible void name(struct pt_regs *regs) \
+{ \
+ do_trap_error(regs, signo, code, regs->pc, "Oops - " str); \
+}
- vector = (regs->sr >> 16) & 0xff;
+DO_ERROR_INFO(do_trap_unknown,
+ SIGILL, ILL_ILLTRP, "unknown exception");
+DO_ERROR_INFO(do_trap_zdiv,
+ SIGFPE, FPE_INTDIV, "error zero div exception");
+DO_ERROR_INFO(do_trap_buserr,
+ SIGSEGV, ILL_ILLADR, "error bus error exception");
- switch (vector) {
- case VEC_ZERODIV:
- die_if_kernel("Kernel mode ZERO DIV", regs, vector);
- sig = SIGFPE;
- break;
- /* ptrace */
- case VEC_TRACE:
+asmlinkage void do_trap_misaligned(struct pt_regs *regs)
+{
+#ifdef CONFIG_CPU_NEED_SOFTALIGN
+ csky_alignment(regs);
+#else
+ current->thread.trap_no = trap_no(regs);
+ do_trap_error(regs, SIGBUS, BUS_ADRALN, regs->pc,
+ "Oops - load/store address misaligned");
+#endif
+}
+
+asmlinkage void do_trap_bkpt(struct pt_regs *regs)
+{
#ifdef CONFIG_KPROBES
- if (kprobe_single_step_handler(regs))
- return;
+ if (kprobe_single_step_handler(regs))
+ return;
#endif
#ifdef CONFIG_UPROBES
- if (uprobe_single_step_handler(regs))
- return;
+ if (uprobe_single_step_handler(regs))
+ return;
#endif
- info.si_code = TRAP_TRACE;
- sig = SIGTRAP;
- break;
- case VEC_ILLEGAL:
- tsk->thread.trap_no = vector;
+ if (user_mode(regs)) {
+ send_sig(SIGTRAP, current, 0);
+ return;
+ }
+
+ do_trap_error(regs, SIGILL, ILL_ILLTRP, regs->pc,
+ "Oops - illegal trap exception");
+}
+
+asmlinkage void do_trap_illinsn(struct pt_regs *regs)
+{
+ current->thread.trap_no = trap_no(regs);
+
#ifdef CONFIG_KPROBES
- if (kprobe_breakpoint_handler(regs))
- return;
+ if (kprobe_breakpoint_handler(regs))
+ return;
#endif
#ifdef CONFIG_UPROBES
- if (uprobe_breakpoint_handler(regs))
- return;
+ if (uprobe_breakpoint_handler(regs))
+ return;
#endif
- die_if_kernel("Kernel mode ILLEGAL", regs, vector);
#ifndef CONFIG_CPU_NO_USER_BKPT
- if (*(uint16_t *)instruction_pointer(regs) != USR_BKPT)
+ if (*(uint16_t *)instruction_pointer(regs) != USR_BKPT) {
+ send_sig(SIGTRAP, current, 0);
+ return;
+ }
#endif
- {
- sig = SIGILL;
- break;
- }
- /* gdbserver breakpoint */
+
+ do_trap_error(regs, SIGILL, ILL_ILLOPC, regs->pc,
+ "Oops - illegal instruction exception");
+}
+
+asmlinkage void do_trap_fpe(struct pt_regs *regs)
+{
+#ifdef CONFIG_CPU_HAS_FP
+ return fpu_fpe(regs);
+#else
+ do_trap_error(regs, SIGILL, ILL_ILLOPC, regs->pc,
+ "Oops - fpu instruction exception");
+#endif
+}
+
+asmlinkage void do_trap_priv(struct pt_regs *regs)
+{
+#ifdef CONFIG_CPU_HAS_FP
+ if (user_mode(regs) && fpu_libc_helper(regs))
+ return;
+#endif
+ do_trap_error(regs, SIGILL, ILL_PRVOPC, regs->pc,
+ "Oops - illegal privileged exception");
+}
+
+asmlinkage void trap_c(struct pt_regs *regs)
+{
+ switch (trap_no(regs)) {
+ case VEC_ZERODIV:
+ do_trap_zdiv(regs);
+ break;
+ case VEC_TRACE:
+ do_trap_bkpt(regs);
+ break;
+ case VEC_ILLEGAL:
+ do_trap_illinsn(regs);
+ break;
case VEC_TRAP1:
- /* jtagserver breakpoint */
case VEC_BREAKPOINT:
- die_if_kernel("Kernel mode BKPT", regs, vector);
- info.si_code = TRAP_BRKPT;
- sig = SIGTRAP;
+ do_trap_bkpt(regs);
break;
case VEC_ACCESS:
- tsk->thread.trap_no = vector;
- return buserr(regs);
-#ifdef CONFIG_CPU_NEED_SOFTALIGN
+ do_trap_buserr(regs);
+ break;
case VEC_ALIGN:
- tsk->thread.trap_no = vector;
- return csky_alignment(regs);
-#endif
-#ifdef CONFIG_CPU_HAS_FPU
+ do_trap_misaligned(regs);
+ break;
case VEC_FPE:
- tsk->thread.trap_no = vector;
- die_if_kernel("Kernel mode FPE", regs, vector);
- return fpu_fpe(regs);
+ do_trap_fpe(regs);
+ break;
case VEC_PRIV:
- tsk->thread.trap_no = vector;
- die_if_kernel("Kernel mode PRIV", regs, vector);
- if (fpu_libc_helper(regs))
- return;
-#endif
+ do_trap_priv(regs);
+ break;
default:
- sig = SIGSEGV;
+ do_trap_unknown(regs);
break;
}
-
- tsk->thread.trap_no = vector;
-
- send_sig(sig, current, 0);
}
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-12-07 00:15:18 +0000