^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright IBM Corp. 2008, 2009
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/linkage.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <asm/asm-offsets.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <asm/ftrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <asm/nospec-insn.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <asm/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <asm/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) GEN_BR_THUNK %r1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) GEN_BR_THUNK %r14
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) .section .kprobes.text, "ax"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) ENTRY(ftrace_stub)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) BR_EX %r14
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) ENDPROC(ftrace_stub)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define STACK_FRAME_SIZE (STACK_FRAME_OVERHEAD + __PT_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define STACK_PTREGS (STACK_FRAME_OVERHEAD)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define STACK_PTREGS_GPRS (STACK_PTREGS + __PT_GPRS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #define STACK_PTREGS_PSW (STACK_PTREGS + __PT_PSW)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #ifdef __PACK_STACK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) /* allocate just enough for r14, r15 and backchain */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define TRACED_FUNC_FRAME_SIZE 24
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define TRACED_FUNC_FRAME_SIZE STACK_FRAME_OVERHEAD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) ENTRY(_mcount)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) BR_EX %r14
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) ENDPROC(_mcount)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) EXPORT_SYMBOL(_mcount)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) ENTRY(ftrace_caller)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) .globl ftrace_regs_caller
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) .set ftrace_regs_caller,ftrace_caller
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) stg %r14,(__SF_GPRS+8*8)(%r15) # save traced function caller
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) lghi %r14,0 # save condition code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) ipm %r14 # don't put any instructions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) sllg %r14,%r14,16 # clobbering CC before this point
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) lgr %r1,%r15
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #if !(defined(CC_USING_HOTPATCH) || defined(CC_USING_NOP_MCOUNT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) aghi %r0,MCOUNT_RETURN_FIXUP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) # allocate stack frame for ftrace_caller to contain traced function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) aghi %r15,-TRACED_FUNC_FRAME_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) stg %r1,__SF_BACKCHAIN(%r15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) stg %r0,(__SF_GPRS+8*8)(%r15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) stg %r15,(__SF_GPRS+9*8)(%r15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) # allocate pt_regs and stack frame for ftrace_trace_function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) aghi %r15,-STACK_FRAME_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) stg %r1,(STACK_PTREGS_GPRS+15*8)(%r15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) stg %r14,(STACK_PTREGS_PSW)(%r15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) lg %r14,(__SF_GPRS+8*8)(%r1) # restore original return address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) stosm (STACK_PTREGS_PSW)(%r15),0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) aghi %r1,-TRACED_FUNC_FRAME_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) stg %r1,__SF_BACKCHAIN(%r15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) stg %r0,(STACK_PTREGS_PSW+8)(%r15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) stmg %r2,%r14,(STACK_PTREGS_GPRS+2*8)(%r15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) #ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) aghik %r2,%r0,-MCOUNT_INSN_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) lgrl %r4,function_trace_op
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) lgrl %r1,ftrace_func
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) lgr %r2,%r0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) aghi %r2,-MCOUNT_INSN_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) larl %r4,function_trace_op
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) lg %r4,0(%r4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) larl %r1,ftrace_func
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) lg %r1,0(%r1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) lgr %r3,%r14
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) la %r5,STACK_PTREGS(%r15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) BASR_EX %r14,%r1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) #ifdef CONFIG_FUNCTION_GRAPH_TRACER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) # The j instruction gets runtime patched to a nop instruction.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) # See ftrace_enable_ftrace_graph_caller.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) .globl ftrace_graph_caller
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) ftrace_graph_caller:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) j ftrace_graph_caller_end
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) lmg %r2,%r3,(STACK_PTREGS_GPRS+14*8)(%r15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) lg %r4,(STACK_PTREGS_PSW+8)(%r15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) brasl %r14,prepare_ftrace_return
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) stg %r2,(STACK_PTREGS_GPRS+14*8)(%r15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) ftrace_graph_caller_end:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) .globl ftrace_graph_caller_end
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) lg %r1,(STACK_PTREGS_PSW+8)(%r15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) lmg %r2,%r15,(STACK_PTREGS_GPRS+2*8)(%r15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) BR_EX %r1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) ENDPROC(ftrace_caller)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) #ifdef CONFIG_FUNCTION_GRAPH_TRACER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) ENTRY(return_to_handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) stmg %r2,%r5,32(%r15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) lgr %r1,%r15
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) aghi %r15,-STACK_FRAME_OVERHEAD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) stg %r1,__SF_BACKCHAIN(%r15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) brasl %r14,ftrace_return_to_handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) aghi %r15,STACK_FRAME_OVERHEAD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) lgr %r14,%r2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) lmg %r2,%r5,32(%r15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) BR_EX %r14
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) ENDPROC(return_to_handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) #endif
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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