1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright IBM Corp. 2008, 2009
7 #include <linux/linkage.h>
8 #include <asm/asm-offsets.h>
9 #include <asm/ftrace.h>
10 #include <asm/nospec-insn.h>
11 #include <asm/ptrace.h>
12 #include <asm/export.h>
17 .section .kprobes.text, "ax"
23 #define STACK_FRAME_SIZE (STACK_FRAME_OVERHEAD + __PT_SIZE)
24 #define STACK_PTREGS (STACK_FRAME_OVERHEAD)
25 #define STACK_PTREGS_GPRS (STACK_PTREGS + __PT_GPRS)
26 #define STACK_PTREGS_PSW (STACK_PTREGS + __PT_PSW)
27 #define STACK_PTREGS_ORIG_GPR2 (STACK_PTREGS + __PT_ORIG_GPR2)
28 #define STACK_PTREGS_FLAGS (STACK_PTREGS + __PT_FLAGS)
30 /* allocate just enough for r14, r15 and backchain */
31 #define TRACED_FUNC_FRAME_SIZE 24
33 #define TRACED_FUNC_FRAME_SIZE STACK_FRAME_OVERHEAD
36 .macro ftrace_regs_entry, allregs=0
37 stg %r14,(__SF_GPRS+8*8)(%r15) # save traced function caller
40 lghi %r14,0 # save condition code
41 ipm %r14 # don't put any instructions
42 sllg %r14,%r14,16 # clobbering CC before this point
46 # allocate stack frame for ftrace_caller to contain traced function
47 aghi %r15,-TRACED_FUNC_FRAME_SIZE
48 stg %r1,__SF_BACKCHAIN(%r15)
49 stg %r0,(__SF_GPRS+8*8)(%r15)
50 stg %r15,(__SF_GPRS+9*8)(%r15)
51 # allocate pt_regs and stack frame for ftrace_trace_function
52 aghi %r15,-STACK_FRAME_SIZE
53 stg %r1,(STACK_PTREGS_GPRS+15*8)(%r15)
54 xc STACK_PTREGS_ORIG_GPR2(8,%r15),STACK_PTREGS_ORIG_GPR2(%r15)
57 stg %r14,(STACK_PTREGS_PSW)(%r15)
58 stosm (STACK_PTREGS_PSW)(%r15),0
59 #ifdef CONFIG_HAVE_MARCH_Z10_FEATURES
60 mvghi STACK_PTREGS_FLAGS(%r15),_PIF_FTRACE_FULL_REGS
62 lghi %r14,_PIF_FTRACE_FULL_REGS
63 stg %r14,STACK_PTREGS_FLAGS(%r15)
66 xc STACK_PTREGS_FLAGS(8,%r15),STACK_PTREGS_FLAGS(%r15)
69 lg %r14,(__SF_GPRS+8*8)(%r1) # restore original return address
70 aghi %r1,-TRACED_FUNC_FRAME_SIZE
71 stg %r1,__SF_BACKCHAIN(%r15)
72 stg %r0,(STACK_PTREGS_PSW+8)(%r15)
73 stmg %r2,%r14,(STACK_PTREGS_GPRS+2*8)(%r15)
76 SYM_CODE_START(ftrace_regs_caller)
79 SYM_CODE_END(ftrace_regs_caller)
81 SYM_CODE_START(ftrace_caller)
84 SYM_CODE_END(ftrace_caller)
86 SYM_CODE_START(ftrace_common)
87 #ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
88 aghik %r2,%r0,-MCOUNT_INSN_SIZE
89 lgrl %r4,function_trace_op
93 aghi %r2,-MCOUNT_INSN_SIZE
94 larl %r4,function_trace_op
100 la %r5,STACK_PTREGS(%r15)
102 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
103 # The j instruction gets runtime patched to a nop instruction.
104 # See ftrace_enable_ftrace_graph_caller.
105 SYM_INNER_LABEL(ftrace_graph_caller, SYM_L_GLOBAL)
106 j .Lftrace_graph_caller_end
107 lmg %r2,%r3,(STACK_PTREGS_GPRS+14*8)(%r15)
108 lg %r4,(STACK_PTREGS_PSW+8)(%r15)
109 brasl %r14,prepare_ftrace_return
110 stg %r2,(STACK_PTREGS_GPRS+14*8)(%r15)
111 .Lftrace_graph_caller_end:
113 lg %r0,(STACK_PTREGS_PSW+8)(%r15)
114 #ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
115 ltg %r1,STACK_PTREGS_ORIG_GPR2(%r15)
118 lg %r1,STACK_PTREGS_ORIG_GPR2(%r15)
123 0: lmg %r2,%r15,(STACK_PTREGS_GPRS+2*8)(%r15)
125 SYM_CODE_END(ftrace_common)
127 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
129 SYM_FUNC_START(return_to_handler)
130 stmg %r2,%r5,32(%r15)
132 aghi %r15,-STACK_FRAME_OVERHEAD
133 stg %r1,__SF_BACKCHAIN(%r15)
134 brasl %r14,ftrace_return_to_handler
135 aghi %r15,STACK_FRAME_OVERHEAD
139 SYM_FUNC_END(return_to_handler)