57 lines
918 B
ArmAsm
57 lines
918 B
ArmAsm
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/* SPDX-License-Identifier: GPL-2.0 */
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#include <as-layout.h>
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.section .__syscall_stub, "ax"
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.globl batch_syscall_stub
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batch_syscall_stub:
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/* %esp comes in as "top of page" */
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mov %esp, %ecx
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/* %esp has pointer to first operation */
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add $8, %esp
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again:
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/* load length of additional data */
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mov 0x0(%esp), %eax
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/* if(length == 0) : end of list */
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/* write possible 0 to header */
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mov %eax, 0x4(%ecx)
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cmpl $0, %eax
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jz done
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/* save current pointer */
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mov %esp, 0x4(%ecx)
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/* skip additional data */
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add %eax, %esp
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/* load syscall-# */
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pop %eax
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/* load syscall params */
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pop %ebx
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pop %ecx
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pop %edx
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pop %esi
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pop %edi
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pop %ebp
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/* execute syscall */
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int $0x80
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/* restore top of page pointer in %ecx */
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mov %esp, %ecx
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andl $(~UM_KERN_PAGE_SIZE) + 1, %ecx
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/* check return value */
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pop %ebx
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cmp %ebx, %eax
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je again
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done:
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/* save return value */
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mov %eax, (%ecx)
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/* stop */
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int3
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