| | 1 | /* |
| | 2 | * Copyright IBM Corp. 2008, 2009 |
| | 3 | * |
| | 4 | * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>, |
| | 5 | * |
| | 6 | */ |
| | 7 | |
| | 8 | #include <linux/linkage.h> |
| | 9 | #include <asm/asm-offsets.h> |
| | 10 | #include <asm/ftrace.h> |
| | 11 | #include <asm/ptrace.h> |
| | 12 | |
| | 13 | .section .kprobes.text, "ax" |
| | 14 | |
| | 15 | ENTRY(ftrace_stub) |
| | 16 | br %r14 |
| | 17 | |
| | 18 | #define STACK_FRAME_SIZE (STACK_FRAME_OVERHEAD + __PT_SIZE) |
| | 19 | #define STACK_PTREGS (STACK_FRAME_OVERHEAD) |
| | 20 | #define STACK_PTREGS_GPRS (STACK_PTREGS + __PT_GPRS) |
| | 21 | #define STACK_PTREGS_PSW (STACK_PTREGS + __PT_PSW) |
| | 22 | |
| | 23 | ENTRY(_mcount) |
| | 24 | br %r14 |
| | 25 | |
| | 26 | ENTRY(ftrace_caller) |
| | 27 | .globl ftrace_regs_caller |
| | 28 | .set ftrace_regs_caller,ftrace_caller |
| | 29 | lgr %r1,%r15 |
| | 30 | #ifndef CC_USING_HOTPATCH |
| | 31 | aghi %r0,MCOUNT_RETURN_FIXUP |
| | 32 | #endif |
| | 33 | aghi %r15,-STACK_FRAME_SIZE |
| | 34 | stg %r1,__SF_BACKCHAIN(%r15) |
| | 35 | stg %r1,(STACK_PTREGS_GPRS+15*8)(%r15) |
| | 36 | stg %r0,(STACK_PTREGS_PSW+8)(%r15) |
| | 37 | stmg %r2,%r14,(STACK_PTREGS_GPRS+2*8)(%r15) |
| | 38 | #ifdef CONFIG_HAVE_MARCH_Z196_FEATURES |
| | 39 | aghik %r2,%r0,-MCOUNT_INSN_SIZE |
| | 40 | lgrl %r4,function_trace_op |
| | 41 | lgrl %r1,ftrace_trace_function |
| | 42 | #else |
| | 43 | lgr %r2,%r0 |
| | 44 | aghi %r2,-MCOUNT_INSN_SIZE |
| | 45 | larl %r4,function_trace_op |
| | 46 | lg %r4,0(%r4) |
| | 47 | larl %r1,ftrace_trace_function |
| | 48 | lg %r1,0(%r1) |
| | 49 | #endif |
| | 50 | lgr %r3,%r14 |
| | 51 | la %r5,STACK_PTREGS(%r15) |
| | 52 | basr %r14,%r1 |
| | 53 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| | 54 | # The j instruction gets runtime patched to a nop instruction. |
| | 55 | # See ftrace_enable_ftrace_graph_caller. |
| | 56 | ENTRY(ftrace_graph_caller) |
| | 57 | j ftrace_graph_caller_end |
| | 58 | lg %r2,(STACK_PTREGS_GPRS+14*8)(%r15) |
| | 59 | lg %r3,(STACK_PTREGS_PSW+8)(%r15) |
| | 60 | brasl %r14,prepare_ftrace_return |
| | 61 | stg %r2,(STACK_PTREGS_GPRS+14*8)(%r15) |
| | 62 | ftrace_graph_caller_end: |
| | 63 | .globl ftrace_graph_caller_end |
| | 64 | #endif |
| | 65 | lg %r1,(STACK_PTREGS_PSW+8)(%r15) |
| | 66 | lmg %r2,%r15,(STACK_PTREGS_GPRS+2*8)(%r15) |
| | 67 | br %r1 |
| | 68 | |
| | 69 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| | 70 | |
| | 71 | ENTRY(return_to_handler) |
| | 72 | stmg %r2,%r5,32(%r15) |
| | 73 | lgr %r1,%r15 |
| | 74 | aghi %r15,-STACK_FRAME_OVERHEAD |
| | 75 | stg %r1,__SF_BACKCHAIN(%r15) |
| | 76 | brasl %r14,ftrace_return_to_handler |
| | 77 | aghi %r15,STACK_FRAME_OVERHEAD |
| | 78 | lgr %r14,%r2 |
| | 79 | lmg %r2,%r5,32(%r15) |
| | 80 | br %r14 |
| | 81 | |
| | 82 | #endif |
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