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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [newlib/] [libc/] [sys/] [sparc64/] [sbrk.S] - Blame information for rev 194

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Line No. Rev Author Line
1 148 jeremybenn 
! 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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