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authorSuresh Siddha <suresh.b.siddha@intel.com>2010-02-11 11:50:59 -0800
committerH. Peter Anvin <hpa@zytor.com>2010-02-11 15:08:17 -0800
commit5b3efd500854d45d305b53c54c97db5970959980 (patch)
tree731629e22791d14b9661cada9c0c69eb38776c3b /include
parent676ad585531e965416fd958747894541dabcec96 (diff)
downloadop-kernel-dev-5b3efd500854d45d305b53c54c97db5970959980.zip
op-kernel-dev-5b3efd500854d45d305b53c54c97db5970959980.tar.gz
x86, ptrace: regset extensions to support xstate
Add the xstate regset support which helps extend the kernel ptrace and the core-dump interfaces to support AVX state etc. This regset interface is designed to support all the future state that gets supported using xsave/xrstor infrastructure. Looking at the memory layout saved by "xsave", one can't say which state is represented in the memory layout. This is because if a particular state is in init state, in the xsave hdr it can be represented by bit '0'. And hence we can't really say by the xsave header wether a state is in init state or the state is not saved in the memory layout. And hence the xsave memory layout available through this regset interface uses SW usable bytes [464..511] to convey what state is represented in the memory layout. First 8 bytes of the sw_usable_bytes[464..467] will be set to OS enabled xstate mask(which is same as the 64bit mask returned by the xgetbv's xCR0). The note NT_X86_XSTATE represents the extended state information in the core file, using the above mentioned memory layout. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> LKML-Reference: <20100211195614.802495327@sbs-t61.sc.intel.com> Signed-off-by: Hongjiu Lu <hjl.tools@gmail.com> Cc: Roland McGrath <roland@redhat.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/elf.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/elf.h b/include/linux/elf.h
index 0cc4d55..a8c4af0 100644
--- a/include/linux/elf.h
+++ b/include/linux/elf.h
@@ -361,6 +361,7 @@ typedef struct elf64_shdr {
#define NT_PPC_VSX 0x102 /* PowerPC VSX registers */
#define NT_386_TLS 0x200 /* i386 TLS slots (struct user_desc) */
#define NT_386_IOPERM 0x201 /* x86 io permission bitmap (1=deny) */
+#define NT_X86_XSTATE 0x202 /* x86 extended state using xsave */
#define NT_S390_HIGH_GPRS 0x300 /* s390 upper register halves */
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