187 lines
4.7 KiB
ArmAsm
187 lines
4.7 KiB
ArmAsm
/* 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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*/
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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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#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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#define STACK_PTREGS_ORIG_GPR2 (STACK_PTREGS + __PT_ORIG_GPR2)
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#define STACK_PTREGS_FLAGS (STACK_PTREGS + __PT_FLAGS)
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/* packed stack: allocate just enough for r14, r15 and backchain */
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#define TRACED_FUNC_FRAME_SIZE 24
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#ifdef CONFIG_FUNCTION_TRACER
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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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SYM_FUNC_START(ftrace_stub)
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BR_EX %r14
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SYM_FUNC_END(ftrace_stub)
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SYM_CODE_START(ftrace_stub_direct_tramp)
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lgr %r1, %r0
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BR_EX %r1
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SYM_CODE_END(ftrace_stub_direct_tramp)
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.macro ftrace_regs_entry, allregs=0
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stg %r14,(__SF_GPRS+8*8)(%r15) # save traced function caller
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.if \allregs == 1
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# save psw mask
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# don't put any instructions clobbering CC before this point
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epsw %r1,%r14
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risbg %r14,%r1,0,31,32
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.endif
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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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xc STACK_PTREGS_ORIG_GPR2(8,%r15),STACK_PTREGS_ORIG_GPR2(%r15)
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.if \allregs == 1
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stg %r14,(STACK_PTREGS_PSW)(%r15)
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mvghi STACK_PTREGS_FLAGS(%r15),_PIF_FTRACE_FULL_REGS
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.else
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xc STACK_PTREGS_FLAGS(8,%r15),STACK_PTREGS_FLAGS(%r15)
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.endif
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lg %r14,(__SF_GPRS+8*8)(%r1) # restore original return address
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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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.endm
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SYM_CODE_START(ftrace_regs_caller)
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ftrace_regs_entry 1
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j ftrace_common
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SYM_CODE_END(ftrace_regs_caller)
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SYM_CODE_START(ftrace_caller)
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ftrace_regs_entry 0
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j ftrace_common
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SYM_CODE_END(ftrace_caller)
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SYM_CODE_START(ftrace_common)
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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_func
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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_func
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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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SYM_INNER_LABEL(ftrace_graph_caller, SYM_L_GLOBAL)
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j .Lftrace_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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.Lftrace_graph_caller_end:
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#endif
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lg %r0,(STACK_PTREGS_PSW+8)(%r15)
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#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
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ltg %r1,STACK_PTREGS_ORIG_GPR2(%r15)
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locgrz %r1,%r0
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#else
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lg %r1,STACK_PTREGS_ORIG_GPR2(%r15)
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ltgr %r1,%r1
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jnz 0f
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lgr %r1,%r0
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#endif
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0: lmg %r2,%r15,(STACK_PTREGS_GPRS+2*8)(%r15)
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BR_EX %r1
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SYM_CODE_END(ftrace_common)
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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SYM_FUNC_START(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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SYM_FUNC_END(return_to_handler)
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#endif
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#endif /* CONFIG_FUNCTION_TRACER */
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SYM_CODE_START(ftrace_shared_hotpatch_trampoline_br)
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lmg %r0,%r1,2(%r1)
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br %r1
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SYM_INNER_LABEL(ftrace_shared_hotpatch_trampoline_br_end, SYM_L_GLOBAL)
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SYM_CODE_END(ftrace_shared_hotpatch_trampoline_br)
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#ifdef CONFIG_EXPOLINE
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SYM_CODE_START(ftrace_shared_hotpatch_trampoline_exrl)
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lmg %r0,%r1,2(%r1)
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exrl %r0,0f
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j .
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0: br %r1
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SYM_INNER_LABEL(ftrace_shared_hotpatch_trampoline_exrl_end, SYM_L_GLOBAL)
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SYM_CODE_END(ftrace_shared_hotpatch_trampoline_exrl)
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#endif /* CONFIG_EXPOLINE */
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#ifdef CONFIG_RETHOOK
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SYM_CODE_START(arch_rethook_trampoline)
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stg %r14,(__SF_GPRS+8*8)(%r15)
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lay %r15,-STACK_FRAME_SIZE(%r15)
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stmg %r0,%r14,STACK_PTREGS_GPRS(%r15)
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# store original stack pointer in backchain and pt_regs
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lay %r7,STACK_FRAME_SIZE(%r15)
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stg %r7,__SF_BACKCHAIN(%r15)
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stg %r7,STACK_PTREGS_GPRS+(15*8)(%r15)
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# store full psw
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epsw %r2,%r3
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risbg %r3,%r2,0,31,32
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stg %r3,STACK_PTREGS_PSW(%r15)
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larl %r1,arch_rethook_trampoline
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stg %r1,STACK_PTREGS_PSW+8(%r15)
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lay %r2,STACK_PTREGS(%r15)
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brasl %r14,arch_rethook_trampoline_callback
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mvc __SF_EMPTY(16,%r7),STACK_PTREGS_PSW(%r15)
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lmg %r0,%r15,STACK_PTREGS_GPRS(%r15)
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lpswe __SF_EMPTY(%r15)
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SYM_CODE_END(arch_rethook_trampoline)
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#endif /* CONFIG_RETHOOK */
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