Messages in this thread Patch in this message | | | Date | Wed, 04 Apr 2007 12:12:02 -0700 | From | Jeremy Fitzhardinge <> | Subject | [patch 11/20] Fix patch site clobbers to include return register |
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Fix a few clobbers to include the return register. The clobbers set is the set of all registers modified (or may be modified) by the code snippet, regardless of whether it was deliberate or accidental.
Also, make sure that callsites which are used in contexts which don't allow clobbers actually save and restore all clobberable registers.
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Zachary Amsden <zach@vmware.com>
--- arch/i386/kernel/entry.S | 2 +- include/asm-i386/paravirt.h | 18 ++++++++++-------- 2 files changed, 11 insertions(+), 9 deletions(-)
=================================================================== --- a/arch/i386/kernel/entry.S +++ b/arch/i386/kernel/entry.S @@ -342,7 +342,7 @@ 1: movl (%ebp),%ebp jae syscall_badsys call *sys_call_table(,%eax,4) movl %eax,PT_EAX(%esp) - DISABLE_INTERRUPTS(CLBR_ECX|CLBR_EDX) + DISABLE_INTERRUPTS(CLBR_ANY) TRACE_IRQS_OFF movl TI_flags(%ebp), %ecx testw $_TIF_ALLWORK_MASK, %cx =================================================================== --- a/include/asm-i386/paravirt.h +++ b/include/asm-i386/paravirt.h @@ -532,7 +532,7 @@ static inline unsigned long __raw_local_ "popl %%edx; popl %%ecx") : "=a"(f) : paravirt_type(save_fl), - paravirt_clobber(CLBR_NONE) + paravirt_clobber(CLBR_EAX) : "memory", "cc"); return f; } @@ -617,27 +617,29 @@ 772:; \ .popsection #define INTERRUPT_RETURN \ - PARA_SITE(PARA_PATCH(PARAVIRT_iret), CLBR_ANY, \ + PARA_SITE(PARA_PATCH(PARAVIRT_iret), CLBR_NONE, \ jmp *%cs:paravirt_ops+PARAVIRT_iret) #define DISABLE_INTERRUPTS(clobbers) \ PARA_SITE(PARA_PATCH(PARAVIRT_irq_disable), clobbers, \ - pushl %ecx; pushl %edx; \ + pushl %eax; pushl %ecx; pushl %edx; \ call *%cs:paravirt_ops+PARAVIRT_irq_disable; \ - popl %edx; popl %ecx) \ + popl %edx; popl %ecx; popl %eax) \ #define ENABLE_INTERRUPTS(clobbers) \ PARA_SITE(PARA_PATCH(PARAVIRT_irq_enable), clobbers, \ - pushl %ecx; pushl %edx; \ + pushl %eax; pushl %ecx; pushl %edx; \ call *%cs:paravirt_ops+PARAVIRT_irq_enable; \ - popl %edx; popl %ecx) + popl %edx; popl %ecx; popl %eax) #define ENABLE_INTERRUPTS_SYSEXIT \ - PARA_SITE(PARA_PATCH(PARAVIRT_irq_enable_sysexit), CLBR_ANY, \ + PARA_SITE(PARA_PATCH(PARAVIRT_irq_enable_sysexit), CLBR_NONE, \ jmp *%cs:paravirt_ops+PARAVIRT_irq_enable_sysexit) #define GET_CR0_INTO_EAX \ - call *paravirt_ops+PARAVIRT_read_cr0 + push %ecx; push %edx; \ + call *paravirt_ops+PARAVIRT_read_cr0; \ + pop %edx; pop %ecx #endif /* __ASSEMBLY__ */ #endif /* CONFIG_PARAVIRT */ --
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