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bdbd952c60
git-svn-id: https://subversion.assembla.com/svn/Daedalusx64/trunk@3 42e9bfbe-799a-4a2d-bad1-236e862a387a
60 lines
1.2 KiB
ArmAsm
60 lines
1.2 KiB
ArmAsm
.globl _mcount
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.ent _mcount
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_mcount:
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.set noreorder
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.set noat
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# generated code already substracts 8 bytes
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# we store our ra, at and a0-a3
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addu $29, $29, -40
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sd $31, 0($29) # store ra
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sd $1, 8($29) # at = ra of caller
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sd $4, 16($29)
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sd $5, 24($29)
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sd $6, 32($29)
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sd $7, 40($29)
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# make sure we're not recursively called when compiling __mcount()
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# with -pg
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la $4, _busy
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lw $5, 0($4)
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bnez $5, done
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nop
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# mark busy
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li $5, 1
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sw $5, 0($4)
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# call internal C handler
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move $4, $1
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move $5, $31
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jal __mcount
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nop
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# unmark busy
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la $4, _busy
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li $5, 0
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sw $5, 0($4)
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done:
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# restore registers
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ld $31, 0($29)
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ld $1, 8($29)
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ld $4, 16($29)
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ld $5, 24($29)
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ld $6, 32($29)
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ld $7, 40($29)
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addu $29, $29, 48 # generated code substracts 8 bytes
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j $31
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move $31, $1 # restore caller's ra
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_busy:
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.space 4
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.set reorder
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.set at
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.end _mcount
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