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| author | Keir Fraser <keir.fraser@citrix.com> | 2010-07-13 18:12:15 +0100 |
|---|---|---|
| committer | Keir Fraser <keir.fraser@citrix.com> | 2010-07-13 18:12:15 +0100 |
| commit | 917335d8b352cb59b5d54592693d80f160582d83 (patch) | |
| tree | 6f0a58884f1bd6e942f9d49995cf09630cab20ae /xen/include/asm-x86/x86_64 | |
| parent | f65bd343b074358ce3222e9aebd70908d0362f25 (diff) | |
| download | xen-917335d8b352cb59b5d54592693d80f160582d83.tar.gz xen-917335d8b352cb59b5d54592693d80f160582d83.tar.bz2 xen-917335d8b352cb59b5d54592693d80f160582d83.zip | |
x86: Avoid assumptions about C struct layouts from asm code.
Largely this involves avoiding assumptions about 'struct cpu_info'.
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
Diffstat (limited to 'xen/include/asm-x86/x86_64')
| -rw-r--r-- | xen/include/asm-x86/x86_64/asm_defns.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/xen/include/asm-x86/x86_64/asm_defns.h b/xen/include/asm-x86/x86_64/asm_defns.h index 7a8cfdbb6a..a56ac63211 100644 --- a/xen/include/asm-x86/x86_64/asm_defns.h +++ b/xen/include/asm-x86/x86_64/asm_defns.h @@ -122,4 +122,12 @@ STR(IRQ) #nr "_interrupt:\n\t" \ "movl $"#nr",4(%rsp)\n\t" \ "jmp common_interrupt"); +#define GET_CPUINFO_FIELD(field,reg) \ + movq $~(STACK_SIZE-1),reg; \ + andq %rsp,reg; \ + orq $(STACK_SIZE-CPUINFO_sizeof+field),reg; +#define GET_CURRENT(reg) \ + GET_CPUINFO_FIELD(CPUINFO_current_vcpu,reg) \ + movq (reg),reg; + #endif /* __X86_64_ASM_DEFNS_H__ */ |