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authorJeremy Fitzhardinge <jeremy@goop.org>2008-07-08 15:06:37 -0700
committerIngo Molnar <mingo@elte.hu>2008-07-16 10:57:00 +0200
commite74359028d5489a281fb2c379a47b1d3cb14526e (patch)
tree564a2049511f15e5c0187fc31b16a45e5b614999 /drivers/rapidio
parentca15f20f1126f897500ade892a2d598a08da1b56 (diff)
xen64: fix calls into hypercall page
The 64-bit calling convention for hypercalls uses different registers from 32-bit. Annoyingly, gcc's asm syntax doesn't have a way to specify one of the extra numeric reigisters in a constraint, so we must use explicitly placed register variables. Given that we have to do it for some args, may as well do it for all. Also fix syntax gcc generates for the call instruction itself. We need a plain direct call, but the asm expansion which works on 32-bit generates a rip-relative addressing mode in 64-bit, which is treated as an indirect call. The alternative is to pass the hypercall page offset into the asm, and have it add it to the hypercall page start address to generate the call. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Stephen Tweedie <sct@redhat.com> Cc: Eduardo Habkost <ehabkost@redhat.com> Cc: Mark McLoughlin <markmc@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'drivers/rapidio')
0 files changed, 0 insertions, 0 deletions