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Annotation of coherent/b/lib/libc/gen/i386/alloca.s, revision 1.1.1.1

1.1       root        1: //////////
                      2: / libc/gen/i386/alloca.s
                      3: / Dynamic stack allocation.
                      4: //////////
                      5: 
                      6: //////////
                      7: / char *
                      8: / alloca(int n)
                      9: / Grab n bytes directly from the stack.
                     10: //////////
                     11: 
                     12:        .globl  alloca
                     13:        .text
                     14: 
                     15: alloca:
                     16:        popl    %edx            / return address to EDX
                     17:        popl    %eax            / nbytes to EAX
                     18:        negl    %eax            / -nbytes
                     19:        andl    %eax, $-4       / round up to dword
                     20:        movl    %ecx, %esp      / saved register pointer to ECX
                     21:        addl    %eax, %esp      / return pointer to EAX
                     22:        movl    %esp, %eax      / allocate
                     23:        pushl   8(%ecx)         / copy saved registers
                     24:        pushl   4(%ecx)
                     25:        pushl   (%ecx)
                     26:        pushl   %eax            / restore arg
                     27:        jmp     *%edx           / and return
                     28: 
                     29: / end of alloca.s

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