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259071c249
it's naturally aligned when entered with the kernel argv array, but if ld.so has been invoked explicitly to run a program, the stack will not be aligned due to having thrown away argv[0].
27 lines
878 B
ArmAsm
27 lines
878 B
ArmAsm
.set noreorder
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.weak _init
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.weak _fini
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.global __start
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.global _start
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__start:
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_start:
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subu $fp, $fp, $fp # Zero the frame pointer.
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lui $gp, %hi(_gp)
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addi $gp, %lo(_gp)
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#la $gp, _gp
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lw $4, %call16(main)($gp) # Get main() ...
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lw $5, ($sp) # Get argc...
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addu $6, $sp, 4 # and argv ...
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lw $7, %call16(_init)($gp) # and _init() ...
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and $sp, $sp, -8 # Align the stack pointer to 8 bytes
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addi $sp, $sp, -4*6 # Leave space for arguments 0..3, arg4, and arg5.
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lw $12, %call16(_fini)($gp) # and _fini() ...
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sw $12, 4*4($sp) # Save arg4.
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sw $0, 4*5($sp) # ldso_fini == NULL
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lw $25, %call16(__libc_start_main)($gp)
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jalr $25 # Let's go!
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nop
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b . # Never gets here.
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nop
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