tree 9da28d4411ef18d194c40cad6130f8bdb0380399
parent d56bdeb9c2e434b91d5e6d605b92bb1cd21177e5
author Alan Hayward <alan.hayward@arm.com> 1526035976 +0100
committer Simon Marchi <simon.marchi@ericsson.com> 1527864020 -0400

Ptrace support for Aarch64 SVE

Add support for reading and writing registers for Aarch64 SVE.
I've made this functionality common as it will be required for
gdbserver when gdbsever sve support is added.

Given that gdbserver does not yet call this function, I am
happy to remove the regcache commonise functions from the
previous patch. However, this would result in code in nat/
that does not compile for gdbserver. I wanted to avoid that.

We need to support the cases where the kernel only gives us a
fpsimd structure. This occurs when there is no active SVE state
in the kernel (for example, after starting a new process).

As per the covering email description, I've included large chunks
of linux kernel headers within an ifdef. Formatting of these macros
remains identical to the Kernel versions (ie not adapted to GNU style).

Added checks to make sure the vector length has not changed whilst
the process is running.

2018-05-11  Alan Hayward  <alan.hayward@arm.com>

gdb/
	* aarch64-linux-nat.c (fetch_sveregs_from_thread): New function.
	(store_sveregs_to_thread): Likewise.
	(aarch64_linux_fetch_inferior_registers): Check for SVE.
	(aarch64_linux_store_inferior_registers): Likewise.
	* nat/aarch64-sve-linux-ptrace.c (aarch64_sve_get_sveregs): New
	function.
	(aarch64_sve_regs_copy_to_regcache): Likewise.
	(aarch64_sve_regs_copy_from_regcache): Likewise.
	* nat/aarch64-sve-linux-ptrace.h (aarch64_sve_get_sveregs): New
	declaration.
	(aarch64_sve_regs_copy_to_regcache): Likewise.
	(aarch64_sve_regs_copy_from_regcache): Likewise.
	(sve_context): Structure from Linux headers.
	(SVE_SIG_ZREGS_SIZE): Define from Linux headers.
	(SVE_SIG_ZREG_SIZE): Likewise.
	(SVE_SIG_PREG_SIZE): Likewise.
	(SVE_SIG_FFR_SIZE): Likewise.
	(SVE_SIG_REGS_OFFSET): Likewise.
	(SVE_SIG_ZREGS_OFFSET): Likewise.
	(SVE_SIG_ZREG_OFFSET): Likewise.
	(SVE_SIG_ZREGS_SIZE): Likewise.
	(SVE_SIG_PREGS_OFFSET): Likewise.
	(SVE_SIG_PREG_OFFSET): Likewise.
	(SVE_SIG_PREGS_SIZE): Likewise.
	(SVE_SIG_FFR_OFFSET): Likewise.
	(SVE_SIG_REGS_SIZE): Likewise.
	(SVE_SIG_CONTEXT_SIZE): Likewise.
	(SVE_PT_REGS_MASK): Likewise.
	(SVE_PT_REGS_FPSIMD): Likewise.
	(SVE_PT_REGS_SVE): Likewise.
	(SVE_PT_VL_INHERIT): Likewise.
	(SVE_PT_VL_ONEXEC): Likewise.
	(SVE_PT_REGS_OFFSET): Likewise.
	(SVE_PT_FPSIMD_OFFSET): Likewise.
	(SVE_PT_FPSIMD_SIZE): Likewise.
	(SVE_PT_SVE_ZREG_SIZE): Likewise.
	(SVE_PT_SVE_PREG_SIZE): Likewise.
	(SVE_PT_SVE_FFR_SIZE): Likewise.
	(SVE_PT_SVE_FPSR_SIZE): Likewise.
	(SVE_PT_SVE_FPCR_SIZE): Likewise.
	(__SVE_SIG_TO_PT): Likewise.
	(SVE_PT_SVE_OFFSET): Likewise.
	(SVE_PT_SVE_ZREGS_OFFSET): Likewise.
	(SVE_PT_SVE_ZREG_OFFSET): Likewise.
	(SVE_PT_SVE_ZREGS_SIZE): Likewise.
	(SVE_PT_SVE_PREGS_OFFSET): Likewise.
	(SVE_PT_SVE_PREG_OFFSET): Likewise.
	(SVE_PT_SVE_PREGS_SIZE): Likewise.
	(SVE_PT_SVE_FFR_OFFSET): Likewise.
	(SVE_PT_SVE_FPSR_OFFSET): Likewise.
	(SVE_PT_SVE_FPCR_OFFSET): Likewise.
	(SVE_PT_SVE_SIZE): Likewise.
	(SVE_PT_SIZE): Likewise.
	(HAS_SVE_STATE): New define.

gdbserver
	* Makefile.in: Add aarch64-sve-linux-ptrace.c.