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x86/paravirt: don't restore second return reg 

Impact: bugfix

In the 32-bit calling convention, %eax:%edx is used to return 64-bit
values.  Don't save and restore %edx around wrapped functions, or they
can't return a full 64-bit result.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Jeremy Fitzhardinge 2009-01-30 23:17:23 -08:00 committed by H. Peter Anvin
parent 4767afbf1f
commit e584f559c7
1 changed files with 2 additions and 2 deletions
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4
arch/x86/include/asm/paravirt.h
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@ -1524,8 +1524,8 @@ extern struct paravirt_patch_site __parainstructions[],
#define PV_RESTORE_REGS "popl %edx; popl %ecx;"
/* save and restore all caller-save registers, except return value */
#define PV_SAVE_ALL_CALLER_REGS PV_SAVE_REGS
#define PV_RESTORE_ALL_CALLER_REGS PV_RESTORE_REGS
#define PV_SAVE_ALL_CALLER_REGS "pushl %ecx;"
#define PV_RESTORE_ALL_CALLER_REGS "popl %ecx;"
#define PV_FLAGS_ARG "0"
#define PV_EXTRA_CLOBBERS