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nds32 patches for 4.19 

Here is the nds32 patch set based on 4.19-rc2.
 Contained in here are the bug fixes, building error fixes and ftrace support
 for nds32.
 
 These are the LTP20170427 testing results.
 
 Total Tests: 1902
 Total Skipped Tests: 592
 Total Failures: 420
 Kernel Version: 4.19.0-rc2-00018-g2c9d30cc16f0-dirty
 Machine Architecture: nds32
 
 Signed-off-by: Greentime Hu <greentime@andestech.com>
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Merge tag 'nds32-for-linus-4.19-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/greentime/linux

Pull nds32 updates from Greentime Hu:
 "Contained in here are the bug fixes, building error fixes and ftrace
  support for nds32"

* tag 'nds32-for-linus-4.19-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/greentime/linux:
  nds32: linker script: GCOV kernel may refers data in __exit
  nds32: fix build error because of wrong semicolon
  nds32: Fix a kernel panic issue because of wrong frame pointer access.
  nds32: Only print one page of stack when die to prevent printing too much information.
  nds32: Add macro definition for offset of lp register on stack
  nds32: Remove the deprecated ABI implementation
  nds32/stack: Get real return address by using ftrace_graph_ret_addr
  nds32/ftrace: Support dynamic function graph tracer
  nds32/ftrace: Support dynamic function tracer
  nds32/ftrace: Add RECORD_MCOUNT support
  nds32/ftrace: Support static function graph tracer
  nds32/ftrace: Support static function tracer
  nds32: Extract the checking and getting pointer to a macro
  nds32: Clean up the coding style
  nds32: Fix get_user/put_user macro expand pointer problem
  nds32: Fix empty call trace
  nds32: add NULL entry to the end of_device_id array
  nds32: fix logic for module
hifive-unleashed-5.1
Linus Torvalds 2018-09-05 09:13:31 -07:00
parent 0e9b103950 3350139c0f
commit d0c1db1da4
16 changed files with 527 additions and 152 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/nds32/Kconfig
View File

@ -40,6 +40,10 @@ config NDS32
select NO_IOPORT_MAP
select RTC_LIB
select THREAD_INFO_IN_TASK
select HAVE_FUNCTION_TRACER
select HAVE_FUNCTION_GRAPH_TRACER
select HAVE_FTRACE_MCOUNT_RECORD
select HAVE_DYNAMIC_FTRACE
help
Andes(nds32) Linux support.

4
arch/nds32/Makefile
View File

@ -5,6 +5,10 @@ KBUILD_DEFCONFIG := defconfig
comma = ,
ifdef CONFIG_FUNCTION_TRACER
arch-y += -malways-save-lp -mno-relax
endif
KBUILD_CFLAGS += $(call cc-option, -mno-sched-prolog-epilog)
KBUILD_CFLAGS += -mcmodel=large

4
arch/nds32/include/asm/elf.h
View File

@ -121,9 +121,9 @@ struct elf32_hdr;
*/
#define ELF_CLASS ELFCLASS32
#ifdef __NDS32_EB__
#define ELF_DATA ELFDATA2MSB;
#define ELF_DATA ELFDATA2MSB
#else
#define ELF_DATA ELFDATA2LSB;
#define ELF_DATA ELFDATA2LSB
#endif
#define ELF_ARCH EM_NDS32
#define USE_ELF_CORE_DUMP

46
arch/nds32/include/asm/ftrace.h 100644
View File

@ -0,0 +1,46 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_NDS32_FTRACE_H
#define __ASM_NDS32_FTRACE_H
#ifdef CONFIG_FUNCTION_TRACER
#define HAVE_FUNCTION_GRAPH_FP_TEST
#define MCOUNT_ADDR ((unsigned long)(_mcount))
/* mcount call is composed of three instructions:
* sethi + ori + jral
*/
#define MCOUNT_INSN_SIZE 12
extern void _mcount(unsigned long parent_ip);
#ifdef CONFIG_DYNAMIC_FTRACE
#define FTRACE_ADDR ((unsigned long)_ftrace_caller)
#ifdef __NDS32_EL__
#define INSN_NOP 0x09000040
#define INSN_SIZE(insn) (((insn & 0x00000080) == 0) ? 4 : 2)
#define IS_SETHI(insn) ((insn & 0x000000fe) == 0x00000046)
#define ENDIAN_CONVERT(insn) be32_to_cpu(insn)
#else /* __NDS32_EB__ */
#define INSN_NOP 0x40000009
#define INSN_SIZE(insn) (((insn & 0x80000000) == 0) ? 4 : 2)
#define IS_SETHI(insn) ((insn & 0xfe000000) == 0x46000000)
#define ENDIAN_CONVERT(insn) (insn)
#endif
extern void _ftrace_caller(unsigned long parent_ip);
static inline unsigned long ftrace_call_adjust(unsigned long addr)
{
return addr;
}
struct dyn_arch_ftrace {
};
#endif /* CONFIG_DYNAMIC_FTRACE */
#endif /* CONFIG_FUNCTION_TRACER */
#endif /* __ASM_NDS32_FTRACE_H */

1
arch/nds32/include/asm/nds32.h
View File

@ -17,6 +17,7 @@
#else
#define FP_OFFSET (-2)
#endif
#define LP_OFFSET (-1)
extern void __init early_trap_init(void);
static inline void GIE_ENABLE(void)

229
arch/nds32/include/asm/uaccess.h
View File

@ -38,7 +38,7 @@ struct exception_table_entry {
extern int fixup_exception(struct pt_regs *regs);
#define KERNEL_DS ((mm_segment_t) { ~0UL })
#define USER_DS ((mm_segment_t) {TASK_SIZE - 1})
#define USER_DS ((mm_segment_t) {TASK_SIZE - 1})
#define get_ds() (KERNEL_DS)
#define get_fs() (current_thread_info()->addr_limit)
@ -49,11 +49,11 @@ static inline void set_fs(mm_segment_t fs)
current_thread_info()->addr_limit = fs;
}
#define segment_eq(a, b) ((a) == (b))
#define segment_eq(a, b) ((a) == (b))
#define __range_ok(addr, size) (size <= get_fs() && addr <= (get_fs() -size))
#define access_ok(type, addr, size) \
#define access_ok(type, addr, size) \
__range_ok((unsigned long)addr, (unsigned long)size)
/*
* Single-value transfer routines. They automatically use the right
@ -75,70 +75,73 @@ static inline void set_fs(mm_segment_t fs)
* versions are void (ie, don't return a value as such).
*/
#define get_user(x,p) \
({ \
long __e = -EFAULT; \
if(likely(access_ok(VERIFY_READ, p, sizeof(*p)))) { \
__e = __get_user(x,p); \
} else \
x = 0; \
__e; \
})
#define __get_user(x,ptr) \
#define get_user __get_user \
#define __get_user(x, ptr) \
({ \
long __gu_err = 0; \
__get_user_err((x),(ptr),__gu_err); \
__get_user_check((x), (ptr), __gu_err); \
__gu_err; \
})
#define __get_user_error(x,ptr,err) \
#define __get_user_error(x, ptr, err) \
({ \
__get_user_err((x),(ptr),err); \
(void) 0; \
__get_user_check((x), (ptr), (err)); \
(void)0; \
})
#define __get_user_err(x,ptr,err) \
#define __get_user_check(x, ptr, err) \
({ \
const __typeof__(*(ptr)) __user *__p = (ptr); \
might_fault(); \
if (access_ok(VERIFY_READ, __p, sizeof(*__p))) { \
__get_user_err((x), __p, (err)); \
} else { \
(x) = 0; (err) = -EFAULT; \
} \
})
#define __get_user_err(x, ptr, err) \
do { \
unsigned long __gu_addr = (unsigned long)(ptr); \
unsigned long __gu_val; \
__chk_user_ptr(ptr); \
switch (sizeof(*(ptr))) { \
case 1: \
__get_user_asm("lbi",__gu_val,__gu_addr,err); \
__get_user_asm("lbi", __gu_val, (ptr), (err)); \
break; \
case 2: \
__get_user_asm("lhi",__gu_val,__gu_addr,err); \
__get_user_asm("lhi", __gu_val, (ptr), (err)); \
break; \
case 4: \
__get_user_asm("lwi",__gu_val,__gu_addr,err); \
__get_user_asm("lwi", __gu_val, (ptr), (err)); \
break; \
case 8: \
__get_user_asm_dword(__gu_val,__gu_addr,err); \
__get_user_asm_dword(__gu_val, (ptr), (err)); \
break; \
default: \
BUILD_BUG(); \
break; \
} \
(x) = (__typeof__(*(ptr)))__gu_val; \
(x) = (__force __typeof__(*(ptr)))__gu_val; \
} while (0)
#define __get_user_asm(inst,x,addr,err) \
asm volatile( \
"1: "inst" %1,[%2]\n" \
"2:\n" \
" .section .fixup,\"ax\"\n" \
" .align 2\n" \
"3: move %0, %3\n" \
" move %1, #0\n" \
" b 2b\n" \
" .previous\n" \
" .section __ex_table,\"a\"\n" \
" .align 3\n" \
" .long 1b, 3b\n" \
" .previous" \
: "+r" (err), "=&r" (x) \
: "r" (addr), "i" (-EFAULT) \
: "cc")
#define __get_user_asm(inst, x, addr, err) \
__asm__ __volatile__ ( \
"1: "inst" %1,[%2]\n" \
"2:\n" \
" .section .fixup,\"ax\"\n" \
" .align 2\n" \
"3: move %0, %3\n" \
" move %1, #0\n" \
" b 2b\n" \
" .previous\n" \
" .section __ex_table,\"a\"\n" \
" .align 3\n" \
" .long 1b, 3b\n" \
" .previous" \
: "+r" (err), "=&r" (x) \
: "r" (addr), "i" (-EFAULT) \
: "cc")
#ifdef __NDS32_EB__
#define __gu_reg_oper0 "%H1"
@ -149,61 +152,66 @@ do { \
#endif
#define __get_user_asm_dword(x, addr, err) \
asm volatile( \
"\n1:\tlwi " __gu_reg_oper0 ",[%2]\n" \
"\n2:\tlwi " __gu_reg_oper1 ",[%2+4]\n" \
"3:\n" \
" .section .fixup,\"ax\"\n" \
" .align 2\n" \
"4: move %0, %3\n" \
" b 3b\n" \
" .previous\n" \
" .section __ex_table,\"a\"\n" \
" .align 3\n" \
" .long 1b, 4b\n" \
" .long 2b, 4b\n" \
" .previous" \
: "+r"(err), "=&r"(x) \
: "r"(addr), "i"(-EFAULT) \
: "cc")
#define put_user(x,p) \
({ \
long __e = -EFAULT; \
if(likely(access_ok(VERIFY_WRITE, p, sizeof(*p)))) { \
__e = __put_user(x,p); \
} \
__e; \
})
#define __put_user(x,ptr) \
__asm__ __volatile__ ( \
"\n1:\tlwi " __gu_reg_oper0 ",[%2]\n" \
"\n2:\tlwi " __gu_reg_oper1 ",[%2+4]\n" \
"3:\n" \
" .section .fixup,\"ax\"\n" \
" .align 2\n" \
"4: move %0, %3\n" \
" b 3b\n" \
" .previous\n" \
" .section __ex_table,\"a\"\n" \
" .align 3\n" \
" .long 1b, 4b\n" \
" .long 2b, 4b\n" \
" .previous" \
: "+r"(err), "=&r"(x) \
: "r"(addr), "i"(-EFAULT) \
: "cc")
#define put_user __put_user \
#define __put_user(x, ptr) \
({ \
long __pu_err = 0; \
__put_user_err((x),(ptr),__pu_err); \
__put_user_err((x), (ptr), __pu_err); \
__pu_err; \
})
#define __put_user_error(x,ptr,err) \
#define __put_user_error(x, ptr, err) \
({ \
__put_user_err((x),(ptr),err); \
(void) 0; \
__put_user_err((x), (ptr), (err)); \
(void)0; \
})
#define __put_user_err(x,ptr,err) \
#define __put_user_check(x, ptr, err) \
({ \
__typeof__(*(ptr)) __user *__p = (ptr); \
might_fault(); \
if (access_ok(VERIFY_WRITE, __p, sizeof(*__p))) { \
__put_user_err((x), __p, (err)); \
} else { \
(err) = -EFAULT; \
} \
})
#define __put_user_err(x, ptr, err) \
do { \
unsigned long __pu_addr = (unsigned long)(ptr); \
__typeof__(*(ptr)) __pu_val = (x); \
__chk_user_ptr(ptr); \
switch (sizeof(*(ptr))) { \
case 1: \
__put_user_asm("sbi",__pu_val,__pu_addr,err); \
__put_user_asm("sbi", __pu_val, (ptr), (err)); \
break; \
case 2: \
__put_user_asm("shi",__pu_val,__pu_addr,err); \
__put_user_asm("shi", __pu_val, (ptr), (err)); \
break; \
case 4: \
__put_user_asm("swi",__pu_val,__pu_addr,err); \
__put_user_asm("swi", __pu_val, (ptr), (err)); \
break; \
case 8: \
__put_user_asm_dword(__pu_val,__pu_addr,err); \
__put_user_asm_dword(__pu_val, (ptr), (err)); \
break; \
default: \
BUILD_BUG(); \
@ -211,22 +219,22 @@ do { \
} \
} while (0)
#define __put_user_asm(inst,x,addr,err) \
asm volatile( \
"1: "inst" %1,[%2]\n" \
"2:\n" \
" .section .fixup,\"ax\"\n" \
" .align 2\n" \
"3: move %0, %3\n" \
" b 2b\n" \
" .previous\n" \
" .section __ex_table,\"a\"\n" \
" .align 3\n" \
" .long 1b, 3b\n" \
" .previous" \
: "+r" (err) \
: "r" (x), "r" (addr), "i" (-EFAULT) \
: "cc")
#define __put_user_asm(inst, x, addr, err) \
__asm__ __volatile__ ( \
"1: "inst" %1,[%2]\n" \
"2:\n" \
" .section .fixup,\"ax\"\n" \
" .align 2\n" \
"3: move %0, %3\n" \
" b 2b\n" \
" .previous\n" \
" .section __ex_table,\"a\"\n" \
" .align 3\n" \
" .long 1b, 3b\n" \
" .previous" \
: "+r" (err) \
: "r" (x), "r" (addr), "i" (-EFAULT) \
: "cc")
#ifdef __NDS32_EB__
#define __pu_reg_oper0 "%H2"
@ -237,23 +245,24 @@ do { \
#endif
#define __put_user_asm_dword(x, addr, err) \
asm volatile( \
"\n1:\tswi " __pu_reg_oper0 ",[%1]\n" \
"\n2:\tswi " __pu_reg_oper1 ",[%1+4]\n" \
"3:\n" \
" .section .fixup,\"ax\"\n" \
" .align 2\n" \
"4: move %0, %3\n" \
" b 3b\n" \
" .previous\n" \
" .section __ex_table,\"a\"\n" \
" .align 3\n" \
" .long 1b, 4b\n" \
" .long 2b, 4b\n" \
" .previous" \
: "+r"(err) \
: "r"(addr), "r"(x), "i"(-EFAULT) \
: "cc")
__asm__ __volatile__ ( \
"\n1:\tswi " __pu_reg_oper0 ",[%1]\n" \
"\n2:\tswi " __pu_reg_oper1 ",[%1+4]\n" \
"3:\n" \
" .section .fixup,\"ax\"\n" \
" .align 2\n" \
"4: move %0, %3\n" \
" b 3b\n" \
" .previous\n" \
" .section __ex_table,\"a\"\n" \
" .align 3\n" \
" .long 1b, 4b\n" \
" .long 2b, 4b\n" \
" .previous" \
: "+r"(err) \
: "r"(addr), "r"(x), "i"(-EFAULT) \
: "cc")
extern unsigned long __arch_clear_user(void __user * addr, unsigned long n);
extern long strncpy_from_user(char *dest, const char __user * src, long count);
extern __must_check long strlen_user(const char __user * str);

6
arch/nds32/kernel/Makefile
View File

@ -21,3 +21,9 @@ extra-y := head.o vmlinux.lds
obj-y += vdso/
obj-$(CONFIG_FUNCTION_TRACER) += ftrace.o
ifdef CONFIG_FUNCTION_TRACER
CFLAGS_REMOVE_ftrace.o = $(CC_FLAGS_FTRACE)
endif

3
arch/nds32/kernel/atl2c.c
View File

@ -9,7 +9,8 @@
void __iomem *atl2c_base;
static const struct of_device_id atl2c_ids[] __initconst = {
{.compatible = "andestech,atl2c",}
{.compatible = "andestech,atl2c",},
{}
};
static int __init atl2c_of_init(void)

2
arch/nds32/kernel/ex-entry.S
View File

@ -118,7 +118,7 @@ common_exception_handler:
/* interrupt */
2:
#ifdef CONFIG_TRACE_IRQFLAGS
jal trace_hardirqs_off
jal __trace_hardirqs_off
#endif
move $r0, $sp
sethi $lp, hi20(ret_from_intr)

4
arch/nds32/kernel/ex-exit.S
View File

@ -138,8 +138,8 @@ no_work_pending:
#ifdef CONFIG_TRACE_IRQFLAGS
lwi $p0, [$sp+(#IPSW_OFFSET)]
andi $p0, $p0, #0x1
la $r10, trace_hardirqs_off
la $r9, trace_hardirqs_on
la $r10, __trace_hardirqs_off
la $r9, __trace_hardirqs_on
cmovz $r9, $p0, $r10
jral $r9
#endif

309
arch/nds32/kernel/ftrace.c 100644
View File

@ -0,0 +1,309 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/ftrace.h>
#include <linux/uaccess.h>
#include <asm/cacheflush.h>
#ifndef CONFIG_DYNAMIC_FTRACE
extern void (*ftrace_trace_function)(unsigned long, unsigned long,
struct ftrace_ops*, struct pt_regs*);
extern int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace);
extern void ftrace_graph_caller(void);
noinline void __naked ftrace_stub(unsigned long ip, unsigned long parent_ip,
struct ftrace_ops *op, struct pt_regs *regs)
{
__asm__ (""); /* avoid to optimize as pure function */
}
noinline void _mcount(unsigned long parent_ip)
{
/* save all state by the compiler prologue */
unsigned long ip = (unsigned long)__builtin_return_address(0);
if (ftrace_trace_function != ftrace_stub)
ftrace_trace_function(ip - MCOUNT_INSN_SIZE, parent_ip,
NULL, NULL);
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
if (ftrace_graph_return != (trace_func_graph_ret_t)ftrace_stub
|| ftrace_graph_entry != ftrace_graph_entry_stub)
ftrace_graph_caller();
#endif
/* restore all state by the compiler epilogue */
}
EXPORT_SYMBOL(_mcount);
#else /* CONFIG_DYNAMIC_FTRACE */
noinline void __naked ftrace_stub(unsigned long ip, unsigned long parent_ip,
struct ftrace_ops *op, struct pt_regs *regs)
{
__asm__ (""); /* avoid to optimize as pure function */
}
noinline void __naked _mcount(unsigned long parent_ip)
{
__asm__ (""); /* avoid to optimize as pure function */
}
EXPORT_SYMBOL(_mcount);
#define XSTR(s) STR(s)
#define STR(s) #s
void _ftrace_caller(unsigned long parent_ip)
{
/* save all state needed by the compiler prologue */
/*
* prepare arguments for real tracing function
* first arg : __builtin_return_address(0) - MCOUNT_INSN_SIZE
* second arg : parent_ip
*/
__asm__ __volatile__ (
"move $r1, %0 \n\t"
"addi $r0, %1, #-" XSTR(MCOUNT_INSN_SIZE) "\n\t"
:
: "r" (parent_ip), "r" (__builtin_return_address(0)));
/* a placeholder for the call to a real tracing function */
__asm__ __volatile__ (
"ftrace_call: \n\t"
"nop \n\t"
"nop \n\t"
"nop \n\t");
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
/* a placeholder for the call to ftrace_graph_caller */
__asm__ __volatile__ (
"ftrace_graph_call: \n\t"
"nop \n\t"
"nop \n\t"
"nop \n\t");
#endif
/* restore all state needed by the compiler epilogue */
}
int __init ftrace_dyn_arch_init(void)
{
return 0;
}
int ftrace_arch_code_modify_prepare(void)
{
set_all_modules_text_rw();
return 0;
}
int ftrace_arch_code_modify_post_process(void)
{
set_all_modules_text_ro();
return 0;
}
static unsigned long gen_sethi_insn(unsigned long addr)
{
unsigned long opcode = 0x46000000;
unsigned long imm = addr >> 12;
unsigned long rt_num = 0xf << 20;
return ENDIAN_CONVERT(opcode | rt_num | imm);
}
static unsigned long gen_ori_insn(unsigned long addr)
{
unsigned long opcode = 0x58000000;
unsigned long imm = addr & 0x0000fff;
unsigned long rt_num = 0xf << 20;
unsigned long ra_num = 0xf << 15;
return ENDIAN_CONVERT(opcode | rt_num | ra_num | imm);
}
static unsigned long gen_jral_insn(unsigned long addr)
{
unsigned long opcode = 0x4a000001;
unsigned long rt_num = 0x1e << 20;
unsigned long rb_num = 0xf << 10;
return ENDIAN_CONVERT(opcode | rt_num | rb_num);
}
static void ftrace_gen_call_insn(unsigned long *call_insns,
unsigned long addr)
{
call_insns[0] = gen_sethi_insn(addr); /* sethi $r15, imm20u */
call_insns[1] = gen_ori_insn(addr); /* ori $r15, $r15, imm15u */
call_insns[2] = gen_jral_insn(addr); /* jral $lp, $r15 */
}
static int __ftrace_modify_code(unsigned long pc, unsigned long *old_insn,
unsigned long *new_insn, bool validate)
{
unsigned long orig_insn[3];
if (validate) {
if (probe_kernel_read(orig_insn, (void *)pc, MCOUNT_INSN_SIZE))
return -EFAULT;
if (memcmp(orig_insn, old_insn, MCOUNT_INSN_SIZE))
return -EINVAL;
}
if (probe_kernel_write((void *)pc, new_insn, MCOUNT_INSN_SIZE))
return -EPERM;
return 0;
}
static int ftrace_modify_code(unsigned long pc, unsigned long *old_insn,
unsigned long *new_insn, bool validate)
{
int ret;
ret = __ftrace_modify_code(pc, old_insn, new_insn, validate);
if (ret)
return ret;
flush_icache_range(pc, pc + MCOUNT_INSN_SIZE);
return ret;
}
int ftrace_update_ftrace_func(ftrace_func_t func)
{
unsigned long pc = (unsigned long)&ftrace_call;
unsigned long old_insn[3] = {INSN_NOP, INSN_NOP, INSN_NOP};
unsigned long new_insn[3] = {INSN_NOP, INSN_NOP, INSN_NOP};
if (func != ftrace_stub)
ftrace_gen_call_insn(new_insn, (unsigned long)func);
return ftrace_modify_code(pc, old_insn, new_insn, false);
}
int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
{
unsigned long pc = rec->ip;
unsigned long nop_insn[3] = {INSN_NOP, INSN_NOP, INSN_NOP};
unsigned long call_insn[3] = {INSN_NOP, INSN_NOP, INSN_NOP};
ftrace_gen_call_insn(call_insn, addr);
return ftrace_modify_code(pc, nop_insn, call_insn, true);
}
int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec,
unsigned long addr)
{
unsigned long pc = rec->ip;
unsigned long nop_insn[3] = {INSN_NOP, INSN_NOP, INSN_NOP};
unsigned long call_insn[3] = {INSN_NOP, INSN_NOP, INSN_NOP};
ftrace_gen_call_insn(call_insn, addr);
return ftrace_modify_code(pc, call_insn, nop_insn, true);
}
#endif /* CONFIG_DYNAMIC_FTRACE */
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
unsigned long frame_pointer)
{
unsigned long return_hooker = (unsigned long)&return_to_handler;
struct ftrace_graph_ent trace;
unsigned long old;
int err;
if (unlikely(atomic_read(&current->tracing_graph_pause)))
return;
old = *parent;
trace.func = self_addr;
trace.depth = current->curr_ret_stack + 1;
/* Only trace if the calling function expects to */
if (!ftrace_graph_entry(&trace))
return;
err = ftrace_push_return_trace(old, self_addr, &trace.depth,
frame_pointer, NULL);
if (err == -EBUSY)
return;
*parent = return_hooker;
}
noinline void ftrace_graph_caller(void)
{
unsigned long *parent_ip =
(unsigned long *)(__builtin_frame_address(2) - 4);
unsigned long selfpc =
(unsigned long)(__builtin_return_address(1) - MCOUNT_INSN_SIZE);
unsigned long frame_pointer =
(unsigned long)__builtin_frame_address(3);
prepare_ftrace_return(parent_ip, selfpc, frame_pointer);
}
extern unsigned long ftrace_return_to_handler(unsigned long frame_pointer);
void __naked return_to_handler(void)
{
__asm__ __volatile__ (
/* save state needed by the ABI */
"smw.adm $r0,[$sp],$r1,#0x0 \n\t"
/* get original return address */
"move $r0, $fp \n\t"
"bal ftrace_return_to_handler\n\t"
"move $lp, $r0 \n\t"
/* restore state nedded by the ABI */
"lmw.bim $r0,[$sp],$r1,#0x0 \n\t");
}
#ifdef CONFIG_DYNAMIC_FTRACE
extern unsigned long ftrace_graph_call;
static int ftrace_modify_graph_caller(bool enable)
{
unsigned long pc = (unsigned long)&ftrace_graph_call;
unsigned long nop_insn[3] = {INSN_NOP, INSN_NOP, INSN_NOP};
unsigned long call_insn[3] = {INSN_NOP, INSN_NOP, INSN_NOP};
ftrace_gen_call_insn(call_insn, (unsigned long)ftrace_graph_caller);
if (enable)
return ftrace_modify_code(pc, nop_insn, call_insn, true);
else
return ftrace_modify_code(pc, call_insn, nop_insn, true);
}
int ftrace_enable_ftrace_graph_caller(void)
{
return ftrace_modify_graph_caller(true);
}
int ftrace_disable_ftrace_graph_caller(void)
{
return ftrace_modify_graph_caller(false);
}
#endif /* CONFIG_DYNAMIC_FTRACE */
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
#ifdef CONFIG_TRACE_IRQFLAGS
noinline void __trace_hardirqs_off(void)
{
trace_hardirqs_off();
}
noinline void __trace_hardirqs_on(void)
{
trace_hardirqs_on();
}
#endif /* CONFIG_TRACE_IRQFLAGS */

4
arch/nds32/kernel/module.c
View File

@ -40,7 +40,7 @@ void do_reloc16(unsigned int val, unsigned int *loc, unsigned int val_mask,
tmp2 = tmp & loc_mask;
if (partial_in_place) {
tmp &= (!loc_mask);
tmp &= (~loc_mask);
tmp =
tmp2 | ((tmp + ((val & val_mask) >> val_shift)) & val_mask);
} else {
@ -70,7 +70,7 @@ void do_reloc32(unsigned int val, unsigned int *loc, unsigned int val_mask,
tmp2 = tmp & loc_mask;
if (partial_in_place) {
tmp &= (!loc_mask);
tmp &= (~loc_mask);
tmp =
tmp2 | ((tmp + ((val & val_mask) >> val_shift)) & val_mask);
} else {

6
arch/nds32/kernel/stacktrace.c
View File

@ -4,6 +4,7 @@
#include <linux/sched/debug.h>
#include <linux/sched/task_stack.h>
#include <linux/stacktrace.h>
#include <linux/ftrace.h>
void save_stack_trace(struct stack_trace *trace)
{
@ -16,6 +17,7 @@ void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
unsigned long *fpn;
int skip = trace->skip;
int savesched;
int graph_idx = 0;
if (tsk == current) {
__asm__ __volatile__("\tori\t%0, $fp, #0\n":"=r"(fpn));
@ -29,10 +31,12 @@ void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
&& (fpn >= (unsigned long *)TASK_SIZE)) {
unsigned long lpp, fpp;
lpp = fpn[-1];
lpp = fpn[LP_OFFSET];
fpp = fpn[FP_OFFSET];
if (!__kernel_text_address(lpp))
break;
else
lpp = ftrace_graph_ret_addr(tsk, &graph_idx, lpp, NULL);
if (savesched || !in_sched_functions(lpp)) {
if (skip) {

42
arch/nds32/kernel/traps.c
View File

@ -8,6 +8,7 @@
#include <linux/kdebug.h>
#include <linux/sched/task_stack.h>
#include <linux/uaccess.h>
#include <linux/ftrace.h>
#include <asm/proc-fns.h>
#include <asm/unistd.h>
@ -94,28 +95,6 @@ static void dump_instr(struct pt_regs *regs)
set_fs(fs);
}
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
#include <linux/ftrace.h>
static void
get_real_ret_addr(unsigned long *addr, struct task_struct *tsk, int *graph)
{
if (*addr == (unsigned long)return_to_handler) {
int index = tsk->curr_ret_stack;
if (tsk->ret_stack && index >= *graph) {
index -= *graph;
*addr = tsk->ret_stack[index].ret;
(*graph)++;
}
}
}
#else
static inline void
get_real_ret_addr(unsigned long *addr, struct task_struct *tsk, int *graph)
{
}
#endif
#define LOOP_TIMES (100)
static void __dump(struct task_struct *tsk, unsigned long *base_reg)
{
@ -126,7 +105,8 @@ static void __dump(struct task_struct *tsk, unsigned long *base_reg)
while (!kstack_end(base_reg)) {
ret_addr = *base_reg++;
if (__kernel_text_address(ret_addr)) {
get_real_ret_addr(&ret_addr, tsk, &graph);
ret_addr = ftrace_graph_ret_addr(
tsk, &graph, ret_addr, NULL);
print_ip_sym(ret_addr);
}
if (--cnt < 0)
@ -137,15 +117,12 @@ static void __dump(struct task_struct *tsk, unsigned long *base_reg)
!((unsigned long)base_reg & 0x3) &&
((unsigned long)base_reg >= TASK_SIZE)) {
unsigned long next_fp;
#if !defined(NDS32_ABI_2)
ret_addr = base_reg[0];
next_fp = base_reg[1];
#else
ret_addr = base_reg[-1];
ret_addr = base_reg[LP_OFFSET];
next_fp = base_reg[FP_OFFSET];
#endif
if (__kernel_text_address(ret_addr)) {
get_real_ret_addr(&ret_addr, tsk, &graph);
ret_addr = ftrace_graph_ret_addr(
tsk, &graph, ret_addr, NULL);
print_ip_sym(ret_addr);
}
if (--cnt < 0)
@ -196,11 +173,10 @@ void die(const char *str, struct pt_regs *regs, int err)
pr_emerg("CPU: %i\n", smp_processor_id());
show_regs(regs);
pr_emerg("Process %s (pid: %d, stack limit = 0x%p)\n",
tsk->comm, tsk->pid, task_thread_info(tsk) + 1);
tsk->comm, tsk->pid, end_of_stack(tsk));
if (!user_mode(regs) || in_interrupt()) {
dump_mem("Stack: ", regs->sp,
THREAD_SIZE + (unsigned long)task_thread_info(tsk));
dump_mem("Stack: ", regs->sp, (regs->sp + PAGE_SIZE) & PAGE_MASK);
dump_instr(regs);
dump_stack();
}

12
arch/nds32/kernel/vmlinux.lds.S
View File

@ -13,14 +13,26 @@ OUTPUT_ARCH(nds32)
ENTRY(_stext_lma)
jiffies = jiffies_64;
#if defined(CONFIG_GCOV_KERNEL)
#define NDS32_EXIT_KEEP(x) x
#else
#define NDS32_EXIT_KEEP(x)
#endif
SECTIONS
{
_stext_lma = TEXTADDR - LOAD_OFFSET;
. = TEXTADDR;
__init_begin = .;
HEAD_TEXT_SECTION
.exit.text : {
NDS32_EXIT_KEEP(EXIT_TEXT)
}
INIT_TEXT_SECTION(PAGE_SIZE)
INIT_DATA_SECTION(16)
.exit.data : {
NDS32_EXIT_KEEP(EXIT_DATA)
}
PERCPU_SECTION(L1_CACHE_BYTES)
__init_end = .;

3
scripts/recordmcount.pl
View File

@ -389,6 +389,9 @@ if ($arch eq "x86_64") {
$mcount_regex = "^\\s*([0-9a-fA-F]+):\\sR_RISCV_CALL\\s_mcount\$";
$type = ".quad";
$alignment = 2;
} elsif ($arch eq "nds32") {
$mcount_regex = "^\\s*([0-9a-fA-F]+):\\s*R_NDS32_HI20_RELA\\s+_mcount\$";
$alignment = 2;
} else {
die "Arch $arch is not supported with CONFIG_FTRACE_MCOUNT_RECORD";
}