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106 lines
2.8 KiB
106 lines
2.8 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* Copyright IBM Corp. 2008, 2009 |
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* |
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* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>, |
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* |
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*/ |
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#include <linux/linkage.h> |
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#include <asm/asm-offsets.h> |
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#include <asm/ftrace.h> |
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#include <asm/nospec-insn.h> |
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#include <asm/ptrace.h> |
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#include <asm/export.h> |
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GEN_BR_THUNK %r1 |
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GEN_BR_THUNK %r14 |
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.section .kprobes.text, "ax" |
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ENTRY(ftrace_stub) |
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BR_EX %r14 |
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ENDPROC(ftrace_stub) |
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#define STACK_FRAME_SIZE (STACK_FRAME_OVERHEAD + __PT_SIZE) |
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#define STACK_PTREGS (STACK_FRAME_OVERHEAD) |
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#define STACK_PTREGS_GPRS (STACK_PTREGS + __PT_GPRS) |
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#define STACK_PTREGS_PSW (STACK_PTREGS + __PT_PSW) |
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#ifdef __PACK_STACK |
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/* allocate just enough for r14, r15 and backchain */ |
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#define TRACED_FUNC_FRAME_SIZE 24 |
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#else |
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#define TRACED_FUNC_FRAME_SIZE STACK_FRAME_OVERHEAD |
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#endif |
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ENTRY(ftrace_caller) |
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.globl ftrace_regs_caller |
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.set ftrace_regs_caller,ftrace_caller |
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stg %r14,(__SF_GPRS+8*8)(%r15) # save traced function caller |
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lghi %r14,0 # save condition code |
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ipm %r14 # don't put any instructions |
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sllg %r14,%r14,16 # clobbering CC before this point |
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lgr %r1,%r15 |
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# allocate stack frame for ftrace_caller to contain traced function |
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aghi %r15,-TRACED_FUNC_FRAME_SIZE |
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stg %r1,__SF_BACKCHAIN(%r15) |
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stg %r0,(__SF_GPRS+8*8)(%r15) |
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stg %r15,(__SF_GPRS+9*8)(%r15) |
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# allocate pt_regs and stack frame for ftrace_trace_function |
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aghi %r15,-STACK_FRAME_SIZE |
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stg %r1,(STACK_PTREGS_GPRS+15*8)(%r15) |
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stg %r14,(STACK_PTREGS_PSW)(%r15) |
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lg %r14,(__SF_GPRS+8*8)(%r1) # restore original return address |
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stosm (STACK_PTREGS_PSW)(%r15),0 |
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aghi %r1,-TRACED_FUNC_FRAME_SIZE |
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stg %r1,__SF_BACKCHAIN(%r15) |
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stg %r0,(STACK_PTREGS_PSW+8)(%r15) |
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stmg %r2,%r14,(STACK_PTREGS_GPRS+2*8)(%r15) |
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#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES |
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aghik %r2,%r0,-MCOUNT_INSN_SIZE |
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lgrl %r4,function_trace_op |
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lgrl %r1,ftrace_trace_function |
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#else |
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lgr %r2,%r0 |
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aghi %r2,-MCOUNT_INSN_SIZE |
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larl %r4,function_trace_op |
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lg %r4,0(%r4) |
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larl %r1,ftrace_trace_function |
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lg %r1,0(%r1) |
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#endif |
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lgr %r3,%r14 |
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la %r5,STACK_PTREGS(%r15) |
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BASR_EX %r14,%r1 |
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER |
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# The j instruction gets runtime patched to a nop instruction. |
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# See ftrace_enable_ftrace_graph_caller. |
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.globl ftrace_graph_caller |
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ftrace_graph_caller: |
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j ftrace_graph_caller_end |
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lmg %r2,%r3,(STACK_PTREGS_GPRS+14*8)(%r15) |
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lg %r4,(STACK_PTREGS_PSW+8)(%r15) |
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brasl %r14,prepare_ftrace_return |
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stg %r2,(STACK_PTREGS_GPRS+14*8)(%r15) |
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ftrace_graph_caller_end: |
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.globl ftrace_graph_caller_end |
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#endif |
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lg %r1,(STACK_PTREGS_PSW+8)(%r15) |
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lmg %r2,%r15,(STACK_PTREGS_GPRS+2*8)(%r15) |
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BR_EX %r1 |
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ENDPROC(ftrace_caller) |
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER |
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ENTRY(return_to_handler) |
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stmg %r2,%r5,32(%r15) |
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lgr %r1,%r15 |
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aghi %r15,-STACK_FRAME_OVERHEAD |
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stg %r1,__SF_BACKCHAIN(%r15) |
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brasl %r14,ftrace_return_to_handler |
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aghi %r15,STACK_FRAME_OVERHEAD |
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lgr %r14,%r2 |
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lmg %r2,%r5,32(%r15) |
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BR_EX %r14 |
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ENDPROC(return_to_handler) |
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#endif
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