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| author | rsc <devnull@localhost> | 2006-03-22 16:30:50 +0000 |
|---|---|---|
| committer | rsc <devnull@localhost> | 2006-03-22 16:30:50 +0000 |
| commit | 39ce0d5862cd5fab8c93d60b195610b2ac77a094 (patch) | |
| tree | 0b19fb4f9ea03b3b044f0c7b72ad000f7d02354a /src/libmp/386/mpdigdiv.s | |
| parent | aff51ee51f0bab35fca95569c639042de8acf777 (diff) | |
| download | plan9port-39ce0d5862cd5fab8c93d60b195610b2ac77a094.tar.gz plan9port-39ce0d5862cd5fab8c93d60b195610b2ac77a094.tar.bz2 plan9port-39ce0d5862cd5fab8c93d60b195610b2ac77a094.zip | |
Avoid storing precious data below the stack pointer.
Diffstat (limited to 'src/libmp/386/mpdigdiv.s')
| -rw-r--r-- | src/libmp/386/mpdigdiv.s | 35 |
1 files changed, 15 insertions, 20 deletions
diff --git a/src/libmp/386/mpdigdiv.s b/src/libmp/386/mpdigdiv.s index f02e1616..143bba9b 100644 --- a/src/libmp/386/mpdigdiv.s +++ b/src/libmp/386/mpdigdiv.s @@ -1,19 +1,19 @@ .text - .p2align 2,0x90 .globl mpdigdiv .type mpdigdiv, @function mpdigdiv: /* Prelude */ - pushl %ebp - movl %ebx, -4(%esp) /* save on stack */ - - movl 8(%esp), %ebx - movl (%ebx), %eax - movl 4(%ebx), %edx + pushl %ebp /* save on stack */ + pushl %ebx + + leal 12(%esp), %ebp /* %ebp = FP for now */ + movl 0(%ebp), %ebx /* dividend */ + movl 0(%ebx), %eax + movl 4(%ebx), %edx + movl 4(%ebp), %ebx /* divisor */ + movl 8(%ebp), %ebp /* quotient */ - movl 12(%esp), %ebx - movl 16(%esp), %ebp xorl %ecx, %ecx cmpl %ebx, %edx /* dividend >= 2^32 * divisor */ jae divovfl @@ -21,19 +21,14 @@ mpdigdiv: je divovfl divl %ebx /* AX = DX:AX/BX */ movl %eax, (%ebp) - jmp done +done: + /* Postlude */ + popl %ebx + popl %ebp + ret /* return all 1's */ divovfl: notl %ecx movl %ecx, (%ebp) - -done: - /* Postlude */ - movl -4(%esp), %ebx /* restore from stack */ - movl %esp, %ebp - leave - ret - -.endmpdigdiv: - .size mpdigdiv,.endmpdigdiv-mpdigdiv + jmp done |