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authorSuresh Siddha <suresh.b.siddha@intel.com>2010-02-11 11:51:00 -0800
committerH. Peter Anvin <hpa@zytor.com>2010-02-11 15:08:33 -0800
commit2225a122ae26d542bdce523d9d87a4a7ba10e07b (patch)
tree861117cc1711cdf3c10f76212afe2e57b05d34c4 /include/linux/elf.h
parent5b3efd500854d45d305b53c54c97db5970959980 (diff)
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ptrace: Add support for generic PTRACE_GETREGSET/PTRACE_SETREGSET
Generic support for PTRACE_GETREGSET/PTRACE_SETREGSET commands which export the regsets supported by each architecture using the correponding NT_* types. These NT_* types are already part of the userland ABI, used in representing the architecture specific register sets as different NOTES in an ELF core file. 'addr' parameter for the ptrace system call encode the REGSET type (using the corresppnding NT_* type) and the 'data' parameter points to the struct iovec having the user buffer and the length of that buffer. struct iovec iov = { buf, len}; ret = ptrace(PTRACE_GETREGSET/PTRACE_SETREGSET, pid, NT_XXX_TYPE, &iov); On successful completion, iov.len will be updated by the kernel specifying how much the kernel has written/read to/from the user's iov.buf. x86 extended state registers are primarily exported using this interface. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> LKML-Reference: <20100211195614.886724710@sbs-t61.sc.intel.com> Acked-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/linux/elf.h')
-rw-r--r--include/linux/elf.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/include/linux/elf.h b/include/linux/elf.h
index a8c4af073ce9..d8e6e61ad9ff 100644
--- a/include/linux/elf.h
+++ b/include/linux/elf.h
@@ -349,7 +349,11 @@ typedef struct elf64_shdr {
#define ELF_OSABI ELFOSABI_NONE
#endif
-/* Notes used in ET_CORE */
+/*
+ * Notes used in ET_CORE. Architectures export some of the arch register sets
+ * using the corresponding note types via the PTRACE_GETREGSET and
+ * PTRACE_SETREGSET requests.
+ */
#define NT_PRSTATUS 1
#define NT_PRFPREG 2
#define NT_PRPSINFO 3