mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-24 01:36:48 +07:00
dcddba96cd
With commitef6000b4c6("Disable the __builtin_return_address() warning globally after all)" the kernel does not warn at all again if __builtin_return_address(n) is called with n > 0. Besides the fact that this was a false warning on s390 anyway, due to the always present backchain, we can now revert commit5606330627("s390/dumpstack: implement and use return_address()") again, to simplify the code again. After all I shouldn't have had return_address() implememted at all to workaround this issue. So get rid of this again. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
85 lines
1.6 KiB
C
85 lines
1.6 KiB
C
#ifndef _ASM_S390_FTRACE_H
|
|
#define _ASM_S390_FTRACE_H
|
|
|
|
#define ARCH_SUPPORTS_FTRACE_OPS 1
|
|
|
|
#ifdef CC_USING_HOTPATCH
|
|
#define MCOUNT_INSN_SIZE 6
|
|
#else
|
|
#define MCOUNT_INSN_SIZE 24
|
|
#define MCOUNT_RETURN_FIXUP 18
|
|
#endif
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#define ftrace_return_address(n) __builtin_return_address(n)
|
|
|
|
void _mcount(void);
|
|
void ftrace_caller(void);
|
|
|
|
extern char ftrace_graph_caller_end;
|
|
extern unsigned long ftrace_plt;
|
|
|
|
struct dyn_arch_ftrace { };
|
|
|
|
#define MCOUNT_ADDR ((unsigned long)_mcount)
|
|
#define FTRACE_ADDR ((unsigned long)ftrace_caller)
|
|
|
|
#define KPROBE_ON_FTRACE_NOP 0
|
|
#define KPROBE_ON_FTRACE_CALL 1
|
|
|
|
static inline unsigned long ftrace_call_adjust(unsigned long addr)
|
|
{
|
|
return addr;
|
|
}
|
|
|
|
struct ftrace_insn {
|
|
u16 opc;
|
|
s32 disp;
|
|
} __packed;
|
|
|
|
static inline void ftrace_generate_nop_insn(struct ftrace_insn *insn)
|
|
{
|
|
#ifdef CONFIG_FUNCTION_TRACER
|
|
#ifdef CC_USING_HOTPATCH
|
|
/* brcl 0,0 */
|
|
insn->opc = 0xc004;
|
|
insn->disp = 0;
|
|
#else
|
|
/* jg .+24 */
|
|
insn->opc = 0xc0f4;
|
|
insn->disp = MCOUNT_INSN_SIZE / 2;
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
static inline int is_ftrace_nop(struct ftrace_insn *insn)
|
|
{
|
|
#ifdef CONFIG_FUNCTION_TRACER
|
|
#ifdef CC_USING_HOTPATCH
|
|
if (insn->disp == 0)
|
|
return 1;
|
|
#else
|
|
if (insn->disp == MCOUNT_INSN_SIZE / 2)
|
|
return 1;
|
|
#endif
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static inline void ftrace_generate_call_insn(struct ftrace_insn *insn,
|
|
unsigned long ip)
|
|
{
|
|
#ifdef CONFIG_FUNCTION_TRACER
|
|
unsigned long target;
|
|
|
|
/* brasl r0,ftrace_caller */
|
|
target = is_module_addr((void *) ip) ? ftrace_plt : FTRACE_ADDR;
|
|
insn->opc = 0xc005;
|
|
insn->disp = (target - ip) / 2;
|
|
#endif
|
|
}
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
#endif /* _ASM_S390_FTRACE_H */
|