csky: fixup abiv2 mmap(... O_SYNC) failed.

index 455075b..d605445 100644
@@ -26,6 +26,7 @@
 
 #define _PAGE_CACHE		(3<<9)
 #define _PAGE_UNCACHE		(2<<9)
+#define _PAGE_SO		_PAGE_UNCACHE
 
 #define _CACHE_MASK		(7<<9)
 

index b20ae19..137f793 100644
@@ -32,6 +32,6 @@
 #define _CACHE_MASK		_PAGE_CACHE
 
 #define _CACHE_CACHED		(_PAGE_VALID | _PAGE_CACHE | _PAGE_BUF)
-#define _CACHE_UNCACHED		(_PAGE_VALID | _PAGE_SO)
+#define _CACHE_UNCACHED		(_PAGE_VALID)
 
 #endif /* __ASM_CSKY_PGTABLE_BITS_H */

index 7ad3ff1..cb7c03e 100644
@@ -30,7 +30,7 @@ void __iomem *ioremap(phys_addr_t addr, size_t size)
 	vaddr = (unsigned long)area->addr;
 
 	prot = __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE |
-			_PAGE_GLOBAL | _CACHE_UNCACHED);
+			_PAGE_GLOBAL | _CACHE_UNCACHED | _PAGE_SO);
 
 	if (ioremap_page_range(vaddr, vaddr + size, addr, prot)) {
 		free_vm_area(area);

index 48b5366..d6dbc00 100644
@@ -31,7 +31,12 @@ typedef unsigned long elf_greg_t;
 
 typedef struct user_fp elf_fpregset_t;
 
-#define ELF_NGREG (sizeof(struct pt_regs) / sizeof(elf_greg_t))
+/*
+ * In gdb/bfd elf32-csky.c, csky_elf_grok_prstatus() use fixed size of
+ * elf_prstatus. It's 148 for abiv1 and 220 for abiv2, the size is enough
+ * for coredump and no need full sizeof(struct pt_regs).
+ */
+#define ELF_NGREG ((sizeof(struct pt_regs) / sizeof(elf_greg_t)) - 2)
 
 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
 

new file mode 100644
index 0000000..17c8268
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#ifndef __ABI_CSKY_PTRACE_H
+#define __ABI_CSKY_PTRACE_H
+
+struct switch_stack {
+	unsigned long r8;
+	unsigned long r9;
+	unsigned long r10;
+	unsigned long r11;
+	unsigned long r12;
+	unsigned long r13;
+	unsigned long r14;
+	unsigned long r15;
+};
+#endif /* __ABI_CSKY_PTRACE_H */

index acd0521..edc5cc0 100644
@@ -57,6 +57,8 @@
 	stw	lr, (sp, 60)
 	mflo	lr
 	stw	lr, (sp, 64)
+	mfcr	lr, cr14
+	stw	lr, (sp, 68)
 #endif
 	subi	sp, 80
 .endm

@@ -77,6 +79,8 @@
 	mthi	a0
 	ldw	a0, (sp, 144)
 	mtlo	a0
+	ldw	a0, (sp, 148)
+	mtcr	a0, cr14
 #endif
 
 	ldw     a0, (sp, 24)

@@ -93,9 +97,9 @@
 .endm
 
 .macro SAVE_SWITCH_STACK
-	subi	sp, 64
+	subi    sp, 64
 	stm	r4-r11, (sp)
-	stw	r15, (sp, 32)
+	stw	lr,  (sp, 32)
 	stw	r16, (sp, 36)
 	stw	r17, (sp, 40)
 	stw	r26, (sp, 44)

@@ -103,11 +107,29 @@
 	stw	r28, (sp, 52)
 	stw	r29, (sp, 56)
 	stw	r30, (sp, 60)
+#ifdef CONFIG_CPU_HAS_HILO
+	subi	sp, 16
+	mfhi	lr
+	stw	lr, (sp, 0)
+	mflo	lr
+	stw	lr, (sp, 4)
+	mfcr	lr, cr14
+	stw	lr, (sp, 8)
+#endif
 .endm
 
 .macro RESTORE_SWITCH_STACK
+#ifdef CONFIG_CPU_HAS_HILO
+	ldw	lr, (sp, 0)
+	mthi	lr
+	ldw	lr, (sp, 4)
+	mtlo	lr
+	ldw	lr, (sp, 8)
+	mtcr	lr, cr14
+	addi	sp, 16
+#endif
 	ldm	r4-r11, (sp)
-	ldw	r15, (sp, 32)
+	ldw	lr,  (sp, 32)
 	ldw	r16, (sp, 36)
 	ldw	r17, (sp, 40)
 	ldw	r26, (sp, 44)

new file mode 100644
index 0000000..73a8124
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#ifndef __ABI_CSKY_PTRACE_H
+#define __ABI_CSKY_PTRACE_H
+
+struct switch_stack {
+#ifdef CONFIG_CPU_HAS_HILO
+	unsigned long rhi;
+	unsigned long rlo;
+	unsigned long cr14;
+	unsigned long pad;
+#endif
+	unsigned long r4;
+	unsigned long r5;
+	unsigned long r6;
+	unsigned long r7;
+	unsigned long r8;
+	unsigned long r9;
+	unsigned long r10;
+	unsigned long r11;
+
+	unsigned long r15;
+	unsigned long r16;
+	unsigned long r17;
+	unsigned long r26;
+	unsigned long r27;
+	unsigned long r28;
+	unsigned long r29;
+	unsigned long r30;
+};
+#endif /* __ABI_CSKY_PTRACE_H */

index b174865..5ac3f32 100644
@@ -11,6 +11,7 @@
 #include <asm/cache.h>
 #include <abi/reg_ops.h>
 #include <abi/regdef.h>
+#include <abi/switch_context.h>
 #ifdef CONFIG_CPU_HAS_FPU
 #include <abi/fpu.h>
 #endif

@@ -50,8 +51,6 @@ struct thread_struct {
 	unsigned long  ksp;       /* kernel stack pointer */
 	unsigned long  sr;        /* saved status register */
 	unsigned long  esp0;      /* points to SR of stack frame */
-	unsigned long  hi;
-	unsigned long  lo;
 
 	/* Other stuff associated with the thread. */
 	unsigned long address;      /* Last user fault */

index f10d02c..a4eaa8d 100644
@@ -36,7 +36,7 @@ struct pt_regs {
 
 	unsigned long	rhi;
 	unsigned long	rlo;
-	unsigned long	pad; /* reserved */
+	unsigned long	dcsr;
 #endif
 };
 

@@ -48,43 +48,6 @@ struct user_fp {
 	unsigned long	reserved;
 };
 
-/*
- * Switch stack for switch_to after push pt_regs.
- *
- * ABI_CSKYV2: r4 ~ r11, r15 ~ r17, r26 ~ r30;
- * ABI_CSKYV1: r8 ~ r14, r15;
- */
-struct  switch_stack {
-#if defined(__CSKYABIV2__)
-	unsigned long   r4;
-	unsigned long   r5;
-	unsigned long   r6;
-	unsigned long   r7;
-	unsigned long   r8;
-	unsigned long   r9;
-	unsigned long   r10;
-	unsigned long   r11;
-#else
-	unsigned long   r8;
-	unsigned long   r9;
-	unsigned long   r10;
-	unsigned long   r11;
-	unsigned long   r12;
-	unsigned long   r13;
-	unsigned long   r14;
-#endif
-	unsigned long   r15;
-#if defined(__CSKYABIV2__)
-	unsigned long   r16;
-	unsigned long   r17;
-	unsigned long   r26;
-	unsigned long   r27;
-	unsigned long   r28;
-	unsigned long   r29;
-	unsigned long   r30;
-#endif
-};
-
 #ifdef __KERNEL__
 
 #define PS_S	0x80000000 /* Supervisor Mode */

index 8d3ed81..2f07670 100644
@@ -24,8 +24,6 @@ int main(void)
 	DEFINE(THREAD_FESR,       offsetof(struct thread_struct, user_fp.fesr));
 	DEFINE(THREAD_FCR,        offsetof(struct thread_struct, user_fp.fcr));
 	DEFINE(THREAD_FPREG,      offsetof(struct thread_struct, user_fp.vr));
-	DEFINE(THREAD_DSPHI,      offsetof(struct thread_struct, hi));
-	DEFINE(THREAD_DSPLO,      offsetof(struct thread_struct, lo));
 
 	/* offsets into the thread_info struct */
 	DEFINE(TINFO_FLAGS,       offsetof(struct thread_info, flags));

index 34b3025..a76d466 100644
@@ -95,7 +95,9 @@ static int gpr_set(struct task_struct *target,
 		return ret;
 
 	regs.sr = task_pt_regs(target)->sr;
-
+#ifdef CONFIG_CPU_HAS_HILO
+	regs.dcsr = task_pt_regs(target)->dcsr;
+#endif
 	task_thread_info(target)->tp_value = regs.tls;
 
 	*task_pt_regs(target) = regs;

index 4a929c4..668b79c 100644
@@ -21,6 +21,10 @@ void __init set_send_ipi(void (*func)(const struct cpumask *mask), int irq);
 
 #define raw_smp_processor_id()	(current_thread_info()->cpu)
 
+int __cpu_disable(void);
+
+void __cpu_die(unsigned int cpu);
+
 #endif /* CONFIG_SMP */
 
 #endif /* __ASM_CSKY_SMP_H */

113 lines not on this page · raw message

index a2c69a7..0e9d035 100644
@@ -10,6 +10,7 @@
 #include <asm/types.h>
 #include <asm/page.h>
 #include <asm/processor.h>
+#include <abi/switch_context.h>
 
 struct thread_info {
 	struct task_struct	*task;

@@ -36,6 +37,9 @@ struct thread_info {
 
 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
 
+#define thread_saved_fp(tsk) \
+	((unsigned long)(((struct switch_stack *)(tsk->thread.ksp))->r8))
+
 static inline struct thread_info *current_thread_info(void)
 {
 	unsigned long sp;

index 8ed2002..e555740 100644
@@ -93,26 +93,31 @@ int dump_task_regs(struct task_struct *tsk, elf_gregset_t *pr_regs)
 
 unsigned long get_wchan(struct task_struct *p)
 {
-	unsigned long esp, pc;
-	unsigned long stack_page;
+	unsigned long lr;
+	unsigned long *fp, *stack_start, *stack_end;
 	int count = 0;
 
 	if (!p || p == current || p->state == TASK_RUNNING)
 		return 0;
 
-	stack_page = (unsigned long)p;
-	esp = p->thread.esp0;
+	stack_start = (unsigned long *)end_of_stack(p);
+	stack_end = (unsigned long *)(task_stack_page(p) + THREAD_SIZE);
+
+	fp = (unsigned long *) thread_saved_fp(p);
 	do {
-		if (esp < stack_page+sizeof(struct task_struct) ||
-		    esp >= 8184+stack_page)
+		if (fp < stack_start || fp > stack_end)
 			return 0;
-		/*FIXME: There's may be error here!*/
-		pc = ((unsigned long *)esp)[1];
-		/* FIXME: This depends on the order of these functions. */
-		if (!in_sched_functions(pc))
-			return pc;
-		esp = *(unsigned long *) esp;
+#ifdef CONFIG_STACKTRACE
+		lr = fp[1];
+		fp = (unsigned long *)fp[0];
+#else
+		lr = *fp++;
+#endif
+		if (!in_sched_functions(lr) &&
+		    __kernel_text_address(lr))
+			return lr;
 	} while (count++ < 16);
+
 	return 0;
 }
 EXPORT_SYMBOL(get_wchan);

57 lines not on this page · raw message

index a9a03ac..659253e 100644
@@ -7,60 +7,39 @@ int kstack_depth_to_print = 48;
 
 void show_trace(unsigned long *stack)
 {
-	unsigned long *endstack;
+	unsigned long *stack_end;
+	unsigned long *stack_start;
+	unsigned long *fp;
 	unsigned long addr;
-	int i;
 
-	pr_info("Call Trace:\n");
-	addr = (unsigned long)stack + THREAD_SIZE - 1;
-	endstack = (unsigned long *)(addr & -THREAD_SIZE);
-	i = 0;
-	while (stack + 1 <= endstack) {
-		addr = *stack++;
-		/*
-		 * If the address is either in the text segment of the
-		 * kernel, or in the region which contains vmalloc'ed
-		 * memory, it *may* be the address of a calling
-		 * routine; if so, print it so that someone tracing
-		 * down the cause of the crash will be able to figure
-		 * out the call path that was taken.
-		 */
-		if (__kernel_text_address(addr)) {
-#ifndef CONFIG_KALLSYMS
-			if (i % 5 == 0)
-				pr_cont("\n       ");
+	addr = (unsigned long) stack & THREAD_MASK;
+	stack_start = (unsigned long *) addr;
+	stack_end = (unsigned long *) (addr + THREAD_SIZE);
+
+	fp = stack;
+	pr_info("\nCall Trace:");
+
+	while (fp > stack_start && fp < stack_end) {
+#ifdef CONFIG_STACKTRACE
+		addr	= fp[1];
+		fp	= (unsigned long *) fp[0];
+#else
+		addr	= *fp++;
 #endif
-			pr_cont(" [<%08lx>] %pS\n", addr, (void *)addr);
-			i++;
-		}
+		if (__kernel_text_address(addr))
+			pr_cont("\n[<%08lx>] %pS", addr, (void *)addr);
 	}
 	pr_cont("\n");
 }
 
 void show_stack(struct task_struct *task, unsigned long *stack)
 {
-	unsigned long *p;
-	unsigned long *endstack;
-	int i;
-
 	if (!stack) {
 		if (task)
-			stack = (unsigned long *)task->thread.esp0;
+			stack = (unsigned long *)thread_saved_fp(task);
 		else
 			stack = (unsigned long *)&stack;
 	}
-	endstack = (unsigned long *)
-		(((unsigned long)stack + THREAD_SIZE - 1) & -THREAD_SIZE);
 
-	pr_info("Stack from %08lx:", (unsigned long)stack);
-	p = stack;
-	for (i = 0; i < kstack_depth_to_print; i++) {
-		if (p + 1 > endstack)
-			break;
-		if (i % 8 == 0)
-			pr_cont("\n       ");
-		pr_cont(" %08lx", *p++);
-	}
-	pr_cont("\n");
 	show_trace(stack);
 }

index a76d466..eb62e07 100644
@@ -241,6 +241,7 @@ asmlinkage void syscall_trace(int why, struct pt_regs *regs)
 	regs->regs[SYSTRACE_SAVENUM] = saved_why;
 }
 
+extern void show_stack(struct task_struct *task, unsigned long *stack);
 void show_regs(struct pt_regs *fp)
 {
 	unsigned long   *sp;

@@ -263,35 +264,37 @@ void show_regs(struct pt_regs *fp)
 		       (int) (((unsigned long) current) + 2 * PAGE_SIZE));
 	}
 
-	pr_info("PC: 0x%08lx\n", (long)fp->pc);
+	pr_info("PC: 0x%08lx (%pS)\n", (long)fp->pc, (void *)fp->pc);
+	pr_info("LR: 0x%08lx (%pS)\n", (long)fp->lr, (void *)fp->lr);
+	pr_info("SP: 0x%08lx\n", (long)fp);
 	pr_info("orig_a0: 0x%08lx\n", fp->orig_a0);
 	pr_info("PSR: 0x%08lx\n", (long)fp->sr);
 
-	pr_info("a0: 0x%08lx  a1: 0x%08lx  a2: 0x%08lx  a3: 0x%08lx\n",
-	       fp->a0, fp->a1, fp->a2, fp->a3);
+	pr_info(" a0: 0x%08lx   a1: 0x%08lx   a2: 0x%08lx   a3: 0x%08lx\n",
+		fp->a0, fp->a1, fp->a2, fp->a3);
 #if defined(__CSKYABIV2__)
-	pr_info("r4: 0x%08lx  r5: 0x%08lx    r6: 0x%08lx    r7: 0x%08lx\n",
+	pr_info(" r4: 0x%08lx   r5: 0x%08lx   r6: 0x%08lx   r7: 0x%08lx\n",
 		fp->regs[0], fp->regs[1], fp->regs[2], fp->regs[3]);
-	pr_info("r8: 0x%08lx  r9: 0x%08lx   r10: 0x%08lx   r11: 0x%08lx\n",
+	pr_info(" r8: 0x%08lx   r9: 0x%08lx  r10: 0x%08lx  r11: 0x%08lx\n",
 		fp->regs[4], fp->regs[5], fp->regs[6], fp->regs[7]);
-	pr_info("r12 0x%08lx  r13: 0x%08lx   r15: 0x%08lx\n",
+	pr_info("r12: 0x%08lx  r13: 0x%08lx  r15: 0x%08lx\n",
 		fp->regs[8], fp->regs[9], fp->lr);
-	pr_info("r16:0x%08lx   r17: 0x%08lx   r18: 0x%08lx    r19: 0x%08lx\n",
+	pr_info("r16: 0x%08lx  r17: 0x%08lx  r18: 0x%08lx  r19: 0x%08lx\n",
 		fp->exregs[0], fp->exregs[1], fp->exregs[2], fp->exregs[3]);
-	pr_info("r20 0x%08lx   r21: 0x%08lx   r22: 0x%08lx    r23: 0x%08lx\n",
+	pr_info("r20: 0x%08lx  r21: 0x%08lx  r22: 0x%08lx  r23: 0x%08lx\n",
 		fp->exregs[4], fp->exregs[5], fp->exregs[6], fp->exregs[7]);
-	pr_info("r24 0x%08lx   r25: 0x%08lx   r26: 0x%08lx    r27: 0x%08lx\n",
+	pr_info("r24: 0x%08lx  r25: 0x%08lx  r26: 0x%08lx  r27: 0x%08lx\n",
 		fp->exregs[8], fp->exregs[9], fp->exregs[10], fp->exregs[11]);
-	pr_info("r28 0x%08lx   r29: 0x%08lx   r30: 0x%08lx    tls: 0x%08lx\n",
+	pr_info("r28: 0x%08lx  r29: 0x%08lx  r30: 0x%08lx  tls: 0x%08lx\n",
 		fp->exregs[12], fp->exregs[13], fp->exregs[14], fp->tls);
-	pr_info("hi 0x%08lx    lo: 0x%08lx\n",
+	pr_info(" hi: 0x%08lx   lo: 0x%08lx\n",
 		fp->rhi, fp->rlo);
 #else
-	pr_info("r6: 0x%08lx   r7: 0x%08lx   r8: 0x%08lx   r9: 0x%08lx\n",
+	pr_info(" r6: 0x%08lx   r7: 0x%08lx   r8: 0x%08lx   r9: 0x%08lx\n",
 		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",
+	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",
+	pr_info("r14: 0x%08lx   r1: 0x%08lx  r15: 0x%08lx\n",
 		fp->regs[8], fp->regs[9], fp->lr);
 #endif
 

@@ -313,4 +316,7 @@ void show_regs(struct pt_regs *fp)
 		pr_cont("%08x ", (int) *sp++);
 	}
 	pr_cont("\n");
+
+	show_stack(NULL, (unsigned long *)fp->regs[4]);
+	return;
 }

index 7df57f9..6a94661 100644
@@ -188,8 +188,8 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
 	 * terminate things with extreme prejudice.
 	 */
 	bust_spinlocks(1);
-	pr_alert("Unable to %s at vaddr: %08lx, epc: %08lx\n",
-		 __func__, address, regs->pc);
+	pr_alert("Unable to handle kernel paging request at virtual "
+		 "address 0x%08lx, pc: 0x%08lx\n", address, regs->pc);
 	die_if_kernel("Oops", regs, write);
 
 out_of_memory:

index 5ac3f32..8f45481 100644
@@ -17,14 +17,7 @@
 #endif
 
 struct cpuinfo_csky {
-	unsigned long udelay_val;
 	unsigned long asid_cache;
-	/*
-	 * Capability and feature descriptor structure for CSKY CPU
-	 */
-	unsigned long options;
-	unsigned int processor_id[4];
-	unsigned int fpu_id;
 } __aligned(SMP_CACHE_BYTES);
 
 extern struct cpuinfo_csky cpu_data[];

@@ -50,11 +43,6 @@ extern struct cpuinfo_csky cpu_data[];
 struct thread_struct {
 	unsigned long  ksp;       /* kernel stack pointer */
 	unsigned long  sr;        /* saved status register */
-	unsigned long  esp0;      /* points to SR of stack frame */
-
-	/* Other stuff associated with the thread. */
-	unsigned long address;      /* Last user fault */
-	unsigned long error_code;
 
 	/* FPU regs */
 	struct user_fp __aligned(16) user_fp;

index 2f07670..9b48b1b 100644
@@ -20,7 +20,6 @@ int main(void)
 	/* offsets into the thread struct */
 	DEFINE(THREAD_KSP,        offsetof(struct thread_struct, ksp));
 	DEFINE(THREAD_SR,         offsetof(struct thread_struct, sr));
-	DEFINE(THREAD_ESP0,       offsetof(struct thread_struct, esp0));
 	DEFINE(THREAD_FESR,       offsetof(struct thread_struct, user_fp.fesr));
 	DEFINE(THREAD_FCR,        offsetof(struct thread_struct, user_fp.fcr));
 	DEFINE(THREAD_FPREG,      offsetof(struct thread_struct, user_fp.vr));

index eb62e07..57f1afe 100644
@@ -50,15 +50,11 @@ static void singlestep_enable(struct task_struct *tsk)
  */
 void user_enable_single_step(struct task_struct *child)
 {
-	if (child->thread.esp0 == 0)
-		return;
 	singlestep_enable(child);
 }
 
 void user_disable_single_step(struct task_struct *child)
 {
-	if (child->thread.esp0 == 0)
-		return;
 	singlestep_disable(child);
 }
 

index 66e1b72..e680dc1 100644
@@ -238,8 +238,6 @@ static void do_signal(struct pt_regs *regs, int syscall)
 	if (!user_mode(regs))
 		return;
 
-	current->thread.esp0 = (unsigned long)regs;
-
 	/*
 	 * If we were from a system call, check for system call restarting...
 	 */

index a8368ed..f487a9b 100644
@@ -106,7 +106,6 @@ void buserr(struct pt_regs *regs)
 	pr_err("User mode Bus Error\n");
 	show_regs(regs);
 
-	current->thread.esp0 = (unsigned long) regs;
 	force_sig_fault(SIGSEGV, 0, (void __user *)regs->pc, current);
 }
 

@@ -162,8 +161,3 @@ asmlinkage void trap_c(struct pt_regs *regs)
 	}
 	send_sig(sig, current, 0);
 }
-
-asmlinkage void set_esp0(unsigned long ssp)
-{
-	current->thread.esp0 = ssp;
-}

index 6a94661..d6f4b66 100644
@@ -172,8 +172,6 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
 bad_area_nosemaphore:
 	/* User mode accesses just cause a SIGSEGV */
 	if (user_mode(regs)) {
-		tsk->thread.address = address;
-		tsk->thread.error_code = write;
 		force_sig_fault(SIGSEGV, si_code, (void __user *)address, current);
 		return;
 	}

@@ -207,6 +205,5 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
 	if (!user_mode(regs))
 		goto no_context;
 
-	tsk->thread.address = address;
 	force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address, current);
 }

new file mode 100644
index 0000000..1d22a17
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#ifndef __ASM_CSKY_FTRACE_H
+#define __ASM_CSKY_FTRACE_H
+
+extern void _mcount(unsigned long from_pc);
+
+#endif /* __ASM_CSKY_FTRACE_H */

new file mode 100644
index 0000000..ad054f719
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#include <linux/ftrace.h>
+#include <linux/uaccess.h>
+
+extern void (*ftrace_trace_function)(unsigned long, unsigned long,
+				     struct ftrace_ops*, struct pt_regs*);
+
+
+noinline void __naked ftrace_stub(unsigned long ip, unsigned long parent_ip,
+				  struct ftrace_ops *op, struct pt_regs *regs)
+{
+	asm volatile ("\n");
+}
+
+noinline void csky_mcount(unsigned long from_pc, unsigned long self_pc)
+{
+	if (ftrace_trace_function != ftrace_stub)
+		ftrace_trace_function(self_pc, from_pc, NULL, NULL);
+}
+
+/* _mcount is defined in abi's mcount.S */
+EXPORT_SYMBOL(_mcount);

index 1d22a17..7547c45 100644
@@ -4,6 +4,10 @@
 #ifndef __ASM_CSKY_FTRACE_H
 #define __ASM_CSKY_FTRACE_H
 
-extern void _mcount(unsigned long from_pc);
+#define MCOUNT_INSN_SIZE 4
+
+#define HAVE_FUNCTION_GRAPH_FP_TEST
+
+#define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
 
 #endif /* __ASM_CSKY_FTRACE_H */

58 lines not on this page · raw message

index d6dbc00..e1ec558 100644
@@ -8,6 +8,7 @@
 #include <abi/regdef.h>
 
 #define ELF_ARCH EM_CSKY
+#define EM_CSKY_OLD 39
 
 /* CSKY Relocations */
 #define R_CSKY_NONE               0

@@ -43,7 +44,8 @@ typedef elf_greg_t elf_gregset_t[ELF_NGREG];
 /*
  * This is used to ensure we don't load something for the wrong architecture.
  */
-#define elf_check_arch(x) ((x)->e_machine == ELF_ARCH)
+#define elf_check_arch(x) (((x)->e_machine == ELF_ARCH) || \
+			   ((x)->e_machine == EM_CSKY_OLD))
 
 /*
  * These are used to set parameters in the core dumps.