47 lines
1.2 KiB
ArmAsm
47 lines
1.2 KiB
ArmAsm
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.section .init
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.global __start
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#tls:0 pid process id
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#tls:4 tid reserved for thread slot
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#tls:8 thread's stack low limit
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#tls:12 thread's stack high limit
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#tls:16 reseved for libc
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.align 4
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__start:
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movl $68, %eax
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movl $12, %ebx
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lea __size_of_stack_reserve__, %ecx
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addl $4095, %ecx #load stack size
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andl $-4096, %ecx #align to page granularity
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int $0x40 #and allocate
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testl %eax, %eax
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jz 1f
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addl %eax, %ecx
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movl %eax, %fs:8
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movl %ecx, %fs:12 #save stack base - low limit
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#save stack top - high limit
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movl %ecx, %esp #reload stack
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subl $1024, %esp
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movl $9, %eax
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movl %esp, %ebx
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movl $-1, %ecx
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int $0x40
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movl 30(%ebx), %eax
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movl %eax, %fs:0 #save pid
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addl $1024, %esp
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jmp ___crt_startup
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1:
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int3 #trap to debugger
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.ascii "No enough memory for stack allocation"
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