101 lines
1.6 KiB
ArmAsm
101 lines
1.6 KiB
ArmAsm
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/* Part of libhgfs - (c) 2009, D.C. van Moolenbroek */
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#include <machine/asm.h>
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.text
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MAGIC = 0x564D5868
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BD_PORT = 0x5658
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IO_PORT = 0x5659
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ENTRY(__libhgfs_backdoor)
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pushl %ebx
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pushl %esi
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pushl %edi
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pushl %ebp
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movl 4+16(%esp), %ebp
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movl $MAGIC, %eax
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movl 4(%ebp), %ebx
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movl 8(%ebp), %ecx
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movl 12(%ebp), %edx
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movw $BD_PORT, %dx
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movl 16(%ebp), %esi
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movl 20(%ebp), %edi
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inl %dx
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movl %eax, (%ebp)
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movl %ebx, 4(%ebp)
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movl %ecx, 8(%ebp)
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movl %edx, 12(%ebp)
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movl %esi, 16(%ebp)
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movl %edi, 20(%ebp)
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popl %ebp
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popl %edi
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popl %esi
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popl %ebx
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ret
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ENTRY(__libhgfs_backdoor_in)
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pushl %ebx
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pushl %esi
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pushl %edi
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pushl %ebp
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movl 4+16(%esp), %eax
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movl 4(%eax), %ebx
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movl 8(%eax), %ecx
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movl 12(%eax), %edx
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movw $IO_PORT, %dx
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movl 16(%eax), %esi
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movl 20(%eax), %edi
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movl 24(%eax), %ebp
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movl $MAGIC, %eax
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cld
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repe; insb
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pushl %eax
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movl 4+20(%esp), %eax
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movl %ebx, 4(%eax)
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movl %ecx, 8(%eax)
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movl %edx, 12(%eax)
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movl %esi, 16(%eax)
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movl %edi, 20(%eax)
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movl %ebp, 24(%eax)
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popl %ebx
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movl %ebx, (%eax)
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movl (%eax), %eax
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popl %ebp
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popl %edi
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popl %esi
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popl %ebx
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ret
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ENTRY(__libhgfs_backdoor_out)
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pushl %ebx
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pushl %esi
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pushl %edi
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pushl %ebp
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movl 4+16(%esp), %eax
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movl 4(%eax), %ebx
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movl 8(%eax), %ecx
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movl 12(%eax), %edx
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movw $IO_PORT, %dx
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movl 16(%eax), %esi
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movl 20(%eax), %edi
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movl 24(%eax), %ebp
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movl $MAGIC, %eax
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cld
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repe; outsb
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pushl %eax
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movl 4+20(%esp), %eax
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movl %ebx, 4(%eax)
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movl %ecx, 8(%eax)
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movl %edx, 12(%eax)
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movl %esi, 16(%eax)
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movl %edi, 20(%eax)
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movl %ebp, 24(%eax)
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popl %ebx
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movl %ebx, (%eax)
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movl (%eax), %eax
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popl %ebp
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popl %edi
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popl %esi
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popl %ebx
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ret
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