/* SPDX-License-Identifier: GPL-2.0
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*
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* arch/sh/lib/mcount.S
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*
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* Copyright (C) 2008, 2009 Paul Mundt
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* Copyright (C) 2008, 2009 Matt Fleming
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*/
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#include <asm/ftrace.h>
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#include <asm/thread_info.h>
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#include <asm/asm-offsets.h>
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#define MCOUNT_ENTER() \
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mov.l r4, @-r15; \
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mov.l r5, @-r15; \
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mov.l r6, @-r15; \
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mov.l r7, @-r15; \
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sts.l pr, @-r15; \
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\
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mov.l @(20,r15),r4; \
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sts pr, r5
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#define MCOUNT_LEAVE() \
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lds.l @r15+, pr; \
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mov.l @r15+, r7; \
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mov.l @r15+, r6; \
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mov.l @r15+, r5; \
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rts; \
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mov.l @r15+, r4
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#ifdef CONFIG_STACK_DEBUG
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/*
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* Perform diagnostic checks on the state of the kernel stack.
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*
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* Check for stack overflow. If there is less than 1KB free
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* then it has overflowed.
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*
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* Make sure the stack pointer contains a valid address. Valid
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* addresses for kernel stacks are anywhere after the bss
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* (after __bss_stop) and anywhere in init_thread_union (init_stack).
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*/
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#define STACK_CHECK() \
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mov #(THREAD_SIZE >> 10), r0; \
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shll8 r0; \
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shll2 r0; \
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\
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/* r1 = sp & (THREAD_SIZE - 1) */ \
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mov #-1, r1; \
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add r0, r1; \
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and r15, r1; \
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\
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mov #TI_SIZE, r3; \
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mov #(STACK_WARN >> 8), r2; \
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shll8 r2; \
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add r3, r2; \
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\
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/* Is the stack overflowing? */ \
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cmp/hi r2, r1; \
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bf stack_panic; \
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\
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/* If sp > __bss_stop then we're OK. */ \
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mov.l .L_ebss, r1; \
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cmp/hi r1, r15; \
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bt 1f; \
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\
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/* If sp < init_stack, we're not OK. */ \
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mov.l .L_init_thread_union, r1; \
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cmp/hs r1, r15; \
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bf stack_panic; \
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\
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/* If sp > init_stack && sp < __bss_stop, not OK. */ \
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add r0, r1; \
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cmp/hs r1, r15; \
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bt stack_panic; \
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1:
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#else
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#define STACK_CHECK()
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#endif /* CONFIG_STACK_DEBUG */
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.align 2
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.globl _mcount
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.type _mcount,@function
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.globl mcount
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.type mcount,@function
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_mcount:
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mcount:
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STACK_CHECK()
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#ifndef CONFIG_FUNCTION_TRACER
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rts
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nop
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#else
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MCOUNT_ENTER()
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#ifdef CONFIG_DYNAMIC_FTRACE
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.globl mcount_call
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mcount_call:
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mov.l .Lftrace_stub, r6
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#else
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mov.l .Lftrace_trace_function, r6
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mov.l ftrace_stub, r7
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cmp/eq r6, r7
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bt skip_trace
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mov.l @r6, r6
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#endif
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jsr @r6
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nop
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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mov.l .Lftrace_graph_return, r6
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mov.l .Lftrace_stub, r7
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cmp/eq r6, r7
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bt 1f
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mov.l .Lftrace_graph_caller, r0
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jmp @r0
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nop
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1:
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mov.l .Lftrace_graph_entry, r6
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mov.l .Lftrace_graph_entry_stub, r7
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cmp/eq r6, r7
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bt skip_trace
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mov.l .Lftrace_graph_caller, r0
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jmp @r0
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nop
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.align 2
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.Lftrace_graph_return:
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.long ftrace_graph_return
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.Lftrace_graph_entry:
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.long ftrace_graph_entry
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.Lftrace_graph_entry_stub:
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.long ftrace_graph_entry_stub
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.Lftrace_graph_caller:
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.long ftrace_graph_caller
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#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
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.globl skip_trace
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skip_trace:
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MCOUNT_LEAVE()
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.align 2
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.Lftrace_trace_function:
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.long ftrace_trace_function
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#ifdef CONFIG_DYNAMIC_FTRACE
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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/*
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* NOTE: Do not move either ftrace_graph_call or ftrace_caller
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* as this will affect the calculation of GRAPH_INSN_OFFSET.
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*/
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.globl ftrace_graph_call
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ftrace_graph_call:
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mov.l .Lskip_trace, r0
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jmp @r0
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nop
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.align 2
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.Lskip_trace:
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.long skip_trace
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#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
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.globl ftrace_caller
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ftrace_caller:
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MCOUNT_ENTER()
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.globl ftrace_call
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ftrace_call:
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mov.l .Lftrace_stub, r6
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jsr @r6
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nop
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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bra ftrace_graph_call
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nop
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#else
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MCOUNT_LEAVE()
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#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
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#endif /* CONFIG_DYNAMIC_FTRACE */
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.align 2
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/*
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* NOTE: From here on the locations of the .Lftrace_stub label and
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* ftrace_stub itself are fixed. Adding additional data here will skew
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* the displacement for the memory table and break the block replacement.
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* Place new labels either after the ftrace_stub body, or before
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* ftrace_caller. You have been warned.
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*/
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.Lftrace_stub:
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.long ftrace_stub
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.globl ftrace_stub
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ftrace_stub:
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rts
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nop
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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.globl ftrace_graph_caller
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ftrace_graph_caller:
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mov.l 2f, r1
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jmp @r1
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nop
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1:
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/*
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* MCOUNT_ENTER() pushed 5 registers onto the stack, so
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* the stack address containing our return address is
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* r15 + 20.
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*/
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mov #20, r0
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add r15, r0
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mov r0, r4
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mov.l .Lprepare_ftrace_return, r0
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jsr @r0
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nop
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MCOUNT_LEAVE()
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.align 2
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2: .long skip_trace
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.Lprepare_ftrace_return:
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.long prepare_ftrace_return
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.globl return_to_handler
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return_to_handler:
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/*
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* Save the return values.
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*/
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mov.l r0, @-r15
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mov.l r1, @-r15
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mov #0, r4
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mov.l .Lftrace_return_to_handler, r0
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jsr @r0
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nop
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/*
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* The return value from ftrace_return_handler has the real
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* address that we should return to.
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*/
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lds r0, pr
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mov.l @r15+, r1
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rts
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mov.l @r15+, r0
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.align 2
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.Lftrace_return_to_handler:
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.long ftrace_return_to_handler
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#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
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#endif /* CONFIG_FUNCTION_TRACER */
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#ifdef CONFIG_STACK_DEBUG
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.globl stack_panic
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stack_panic:
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mov.l .Ldump_stack, r0
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jsr @r0
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nop
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mov.l .Lpanic, r0
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jsr @r0
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mov.l .Lpanic_s, r4
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rts
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nop
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.align 2
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.L_init_thread_union:
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.long init_thread_union
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.L_ebss:
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.long __bss_stop
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.Lpanic:
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.long panic
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.Lpanic_s:
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.long .Lpanic_str
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.Ldump_stack:
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.long dump_stack
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.section .rodata
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.align 2
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.Lpanic_str:
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.string "Stack error"
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#endif /* CONFIG_STACK_DEBUG */
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