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authorJames Hogan <james.hogan@imgtec.com>2012-10-09 10:54:36 +0100
committerJames Hogan <james.hogan@imgtec.com>2013-03-02 20:09:22 +0000
commitbc3966bf1583a6c22b76397535174445c43952de (patch)
tree8854b33e95c672078bb32fe878f39b9d716accb5 /include
parent29dd78cf0b526d24063364a8c634b3e92514c1a2 (diff)
downloadvexpress-lsk-bc3966bf1583a6c22b76397535174445c43952de.tar.gz
metag: ptrace
The ptrace interface for metag provides access to some core register sets using the PTRACE_GETREGSET and PTRACE_SETREGSET operations. The details of the internal context structures is abstracted into user API structures to both ease use and allow flexibility to change the internal context layouts. Copyin and copyout functions for these register sets are exposed to allow signal handling code to use them to copy to and from the signal context. struct user_gp_regs (NT_PRSTATUS) provides access to the core general purpose register context. struct user_cb_regs (NT_METAG_CBUF) provides access to the TXCATCH* registers which contains information abuot a memory fault, unaligned access error or watchpoint. This can be modified to alter the way the fault is replayed on resume ("catch replay"), or to prevent the replay taking place. struct user_rp_state (NT_METAG_RPIPE) provides access to the state of the Meta read pipeline which can be used to hide memory latencies in hand optimised data loops. Extended DSP register state, DSP RAM, and hardware breakpoint registers aren't yet exposed through ptrace. Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Denys Vlasenko <vda.linux@googlemail.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Tony Lindgren <tony@atomide.com> Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'include')
-rw-r--r--include/uapi/linux/elf.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h
index 126a8175e3e..eb164a298b9 100644
--- a/include/uapi/linux/elf.h
+++ b/include/uapi/linux/elf.h
@@ -395,6 +395,8 @@ typedef struct elf64_shdr {
#define NT_ARM_TLS 0x401 /* ARM TLS register */
#define NT_ARM_HW_BREAK 0x402 /* ARM hardware breakpoint registers */
#define NT_ARM_HW_WATCH 0x403 /* ARM hardware watchpoint registers */
+#define NT_METAG_CBUF 0x500 /* Metag catch buffer registers */
+#define NT_METAG_RPIPE 0x501 /* Metag read pipeline state */
/* Note header in a PT_NOTE section */