108 lines
2.7 KiB
ArmAsm
108 lines
2.7 KiB
ArmAsm
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
/*
|
||
|
|
* Copyright IBM Corp. 2008, 2009
|
||
|
|
*
|
||
|
|
* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/linkage.h>
|
||
|
|
#include <asm/asm-offsets.h>
|
||
|
|
#include <asm/ftrace.h>
|
||
|
|
#include <asm/nospec-insn.h>
|
||
|
|
#include <asm/ptrace.h>
|
||
|
|
#include <asm/export.h>
|
||
|
|
|
||
|
|
GEN_BR_THUNK %r1
|
||
|
|
GEN_BR_THUNK %r14
|
||
|
|
|
||
|
|
.section .kprobes.text, "ax"
|
||
|
|
|
||
|
|
ENTRY(ftrace_stub)
|
||
|
|
BR_EX %r14
|
||
|
|
ENDPROC(ftrace_stub)
|
||
|
|
|
||
|
|
#define STACK_FRAME_SIZE (STACK_FRAME_OVERHEAD + __PT_SIZE)
|
||
|
|
#define STACK_PTREGS (STACK_FRAME_OVERHEAD)
|
||
|
|
#define STACK_PTREGS_GPRS (STACK_PTREGS + __PT_GPRS)
|
||
|
|
#define STACK_PTREGS_PSW (STACK_PTREGS + __PT_PSW)
|
||
|
|
#ifdef __PACK_STACK
|
||
|
|
/* allocate just enough for r14, r15 and backchain */
|
||
|
|
#define TRACED_FUNC_FRAME_SIZE 24
|
||
|
|
#else
|
||
|
|
#define TRACED_FUNC_FRAME_SIZE STACK_FRAME_OVERHEAD
|
||
|
|
#endif
|
||
|
|
|
||
|
|
ENTRY(_mcount)
|
||
|
|
BR_EX %r14
|
||
|
|
ENDPROC(_mcount)
|
||
|
|
EXPORT_SYMBOL(_mcount)
|
||
|
|
|
||
|
|
ENTRY(ftrace_caller)
|
||
|
|
.globl ftrace_regs_caller
|
||
|
|
.set ftrace_regs_caller,ftrace_caller
|
||
|
|
lgr %r1,%r15
|
||
|
|
#if !(defined(CC_USING_HOTPATCH) || defined(CC_USING_NOP_MCOUNT))
|
||
|
|
aghi %r0,MCOUNT_RETURN_FIXUP
|
||
|
|
#endif
|
||
|
|
# allocate stack frame for ftrace_caller to contain traced function
|
||
|
|
aghi %r15,-TRACED_FUNC_FRAME_SIZE
|
||
|
|
stg %r1,__SF_BACKCHAIN(%r15)
|
||
|
|
stg %r0,(__SF_GPRS+8*8)(%r15)
|
||
|
|
stg %r15,(__SF_GPRS+9*8)(%r15)
|
||
|
|
# allocate pt_regs and stack frame for ftrace_trace_function
|
||
|
|
aghi %r15,-STACK_FRAME_SIZE
|
||
|
|
stg %r1,(STACK_PTREGS_GPRS+15*8)(%r15)
|
||
|
|
aghi %r1,-TRACED_FUNC_FRAME_SIZE
|
||
|
|
stg %r1,__SF_BACKCHAIN(%r15)
|
||
|
|
stg %r0,(STACK_PTREGS_PSW+8)(%r15)
|
||
|
|
stmg %r2,%r14,(STACK_PTREGS_GPRS+2*8)(%r15)
|
||
|
|
#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
|
||
|
|
aghik %r2,%r0,-MCOUNT_INSN_SIZE
|
||
|
|
lgrl %r4,function_trace_op
|
||
|
|
lgrl %r1,ftrace_trace_function
|
||
|
|
#else
|
||
|
|
lgr %r2,%r0
|
||
|
|
aghi %r2,-MCOUNT_INSN_SIZE
|
||
|
|
larl %r4,function_trace_op
|
||
|
|
lg %r4,0(%r4)
|
||
|
|
larl %r1,ftrace_trace_function
|
||
|
|
lg %r1,0(%r1)
|
||
|
|
#endif
|
||
|
|
lgr %r3,%r14
|
||
|
|
la %r5,STACK_PTREGS(%r15)
|
||
|
|
BASR_EX %r14,%r1
|
||
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
||
|
|
# The j instruction gets runtime patched to a nop instruction.
|
||
|
|
# See ftrace_enable_ftrace_graph_caller.
|
||
|
|
.globl ftrace_graph_caller
|
||
|
|
ftrace_graph_caller:
|
||
|
|
j ftrace_graph_caller_end
|
||
|
|
lmg %r2,%r3,(STACK_PTREGS_GPRS+14*8)(%r15)
|
||
|
|
lg %r4,(STACK_PTREGS_PSW+8)(%r15)
|
||
|
|
brasl %r14,prepare_ftrace_return
|
||
|
|
stg %r2,(STACK_PTREGS_GPRS+14*8)(%r15)
|
||
|
|
ftrace_graph_caller_end:
|
||
|
|
.globl ftrace_graph_caller_end
|
||
|
|
#endif
|
||
|
|
lg %r1,(STACK_PTREGS_PSW+8)(%r15)
|
||
|
|
lmg %r2,%r15,(STACK_PTREGS_GPRS+2*8)(%r15)
|
||
|
|
BR_EX %r1
|
||
|
|
ENDPROC(ftrace_caller)
|
||
|
|
|
||
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
||
|
|
|
||
|
|
ENTRY(return_to_handler)
|
||
|
|
stmg %r2,%r5,32(%r15)
|
||
|
|
lgr %r1,%r15
|
||
|
|
aghi %r15,-STACK_FRAME_OVERHEAD
|
||
|
|
stg %r1,__SF_BACKCHAIN(%r15)
|
||
|
|
brasl %r14,ftrace_return_to_handler
|
||
|
|
aghi %r15,STACK_FRAME_OVERHEAD
|
||
|
|
lgr %r14,%r2
|
||
|
|
lmg %r2,%r5,32(%r15)
|
||
|
|
BR_EX %r14
|
||
|
|
ENDPROC(return_to_handler)
|
||
|
|
|
||
|
|
#endif
|