Messages in this thread | | | Date | Mon, 4 Feb 2013 08:34:47 -0800 | Subject | Re: [PATCH] arch: avr32: add dummy syscalls | From | Håvard Skinnemoen <> |
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On Mon, Feb 4, 2013 at 7:39 AM, Al Viro <viro@zeniv.linux.org.uk> wrote: > On Sun, Feb 03, 2013 at 09:35:39PM -0800, H?vard Skinnemoen wrote: >> >> > But yes, 32bit/32bit/64bit/32bit is another interesting case - >> > fanotify_mark is 32/32/64/32/32. From what ABI says it would seem to >> > be r12/r11/r8:r9/r10/stack, but if I understand you correctly, we'll >> > end up wanting *two* arguments on stack... >> >> Yes, I think there may be a difference between the IAR and gcc ABI >> here. But I could be wrong. > > So it will use the gap in case of 32/32/64/32; the first two calls will > take index 0 and 1 (r12 and r11 resp.), the third will take 3 and 4 > (r9:r8) and the fourth will take 2 (r10).
Oh, cool. I guess I am wrong then. Thanks a lot for taking the time to figure this out, and sorry I misled you.
If someone's got the toolchain installed (which I don't, sorry), it should be relatively straightforward to verify this by looking at the disassembly of a call to a function with a similar prototype.
Havard
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