mirror of
https://github.com/autc04/Retro68.git
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79 lines
1.4 KiB
ArmAsm
79 lines
1.4 KiB
ArmAsm
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! sbrk() system call
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#include "sys/syscallasm.h"
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DATA_SECTION
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ALIGN (4)
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! CURBRK contains the current top of allocated space.
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! END is a private symbol in svr4, but a public one in sunos4.
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! FIXME: CURBRK is 4 bytes for now.
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GLOBAL (ASM_PRIVATE_SYMBOL (curbrk))
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ASM_PRIVATE_SYMBOL (curbrk):
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#ifdef __svr4__
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WORD (ASM_PRIVATE_SYMBOL (end))
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#else
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WORD (ASM_SYMBOL (end))
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#endif
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TEXT_SECTION
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ALIGN (4)
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#ifdef REENT
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GLOBAL (ASM_SYMBOL (_sbrk_r))
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ASM_SYMBOL (_sbrk_r):
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mov %o0,%o5
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mov %o1,%o0
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#else
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GLOBAL (ASM_SYMBOL (sbrk))
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ASM_SYMBOL (sbrk):
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#endif
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add %o0,7,%o0
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andn %o0,7,%o0
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sethi %hi (ASM_PRIVATE_SYMBOL (curbrk)),%o2
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lduw [%o2+%lo (ASM_PRIVATE_SYMBOL (curbrk))],%o3
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add %o3,7,%o3
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andn %o3,7,%o3
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add %o3,%o0,%o0
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mov %o0,%o4
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mov SYS_brk,%g1
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ta SYSCALL_TRAP
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bcs err
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nop
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stw %o4,[%o2+%lo (ASM_PRIVATE_SYMBOL (curbrk))]
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jmpl %o7+8,%g0
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mov %o3,%o0
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#ifdef REENT
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GLOBAL (ASM_SYMBOL (_brk_r))
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ASM_SYMBOL (_brk_r):
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mov %o0,%o5
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mov %o1,%o0
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#else
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GLOBAL (ASM_SYMBOL (brk))
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ASM_SYMBOL (brk):
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#endif
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add %o0,7,%o0
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andn %o0,7,%o0
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mov %o0,%o2
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mov SYS_brk,%g1
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ta SYSCALL_TRAP
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bcs err
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nop
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sethi %hi (ASM_PRIVATE_SYMBOL (curbrk)),%o3
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st %o2,[%o3+%lo (ASM_PRIVATE_SYMBOL (curbrk))]
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retl
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mov %g0,%o0
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err:
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#ifdef REENT
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sethi %hi (ASM_PRIVATE_SYMBOL (cerror_r)),%g1
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or %g1,%lo (ASM_PRIVATE_SYMBOL (cerror_r)),%g1
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#else
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sethi %hi (ASM_PRIVATE_SYMBOL (cerror)),%g1
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or %g1,%lo (ASM_PRIVATE_SYMBOL (cerror)),%g1
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#endif
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jmpl %g1,%g0
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mov %o5,%o1
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