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62 lines
1.3 KiB
62 lines
1.3 KiB
20 years ago
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/*
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* Copyright (C) 2000 Anton Blanchard (anton@linuxcare.com)
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*
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* This file implements mcount(), which is used to collect profiling data.
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* This can also be tweaked for kernel stack overflow detection.
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*/
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#include <linux/config.h>
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#include <linux/linkage.h>
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#include <asm/ptrace.h>
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#include <asm/thread_info.h>
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/*
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* This is the main variant and is called by C code. GCC's -pg option
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* automatically instruments every C function with a call to this.
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*/
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#ifdef CONFIG_STACK_DEBUG
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#define OVSTACKSIZE 4096 /* lets hope this is enough */
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.data
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.align 8
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panicstring:
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.asciz "Stack overflow\n"
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.align 8
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ovstack:
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.skip OVSTACKSIZE
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#endif
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.text
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.align 32
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.globl mcount, _mcount
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mcount:
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_mcount:
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#ifdef CONFIG_STACK_DEBUG
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/*
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* Check whether %sp is dangerously low.
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*/
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ldub [%g6 + TI_FPDEPTH], %g1
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srl %g1, 1, %g3
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add %g3, 1, %g3
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sllx %g3, 8, %g3 ! each fpregs frame is 256b
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add %g3, 192, %g3
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add %g6, %g3, %g3 ! where does task_struct+frame end?
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sub %g3, STACK_BIAS, %g3
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cmp %sp, %g3
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bg,pt %xcc, 1f
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sethi %hi(panicstring), %g3
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sethi %hi(ovstack), %g7 ! cant move to panic stack fast enough
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or %g7, %lo(ovstack), %g7
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add %g7, OVSTACKSIZE, %g7
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sub %g7, STACK_BIAS, %g7
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mov %g7, %sp
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call prom_printf
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or %g3, %lo(panicstring), %o0
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call prom_halt
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nop
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#endif
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1: retl
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nop
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