This patch series adds support for reading and writing to and from
system registers via the relevant ACLE-defined builtins [1], making a
series of additions to the aarch64-specific areas of the compiler to
make this possible.
Firstly, a mechanism for defining system registers is established via a
new .def file and the new SYSREG macro. This macro is the same as is
used in Binutils and system register entries are compatible with
either code-base.
Given the information contained in this system register definition
file, a compile-time validation mechanism is implemented, such that any
system register name passed as a string literal argument to these
builtins can be checked against known system registers and its use
for a given target architecture validated.
Finally, patterns for each of these builtins are added to the back-end
such that, if all validation criteria are met, the correct assembly is
emitted.
Thus, the following example of system register access is now valid for
GCC:
long long old = __arm_rsr("trcseqstr");
__arm_wsr("trcseqstr", new);
Testing:
- Bootstrap/regtest on aarch64-linux-gnu done.
[1] https://arm-software.github.io/acle/main/acle.html
Victor Do Nascimento (6):
aarch64: Sync system register information with Binutils
aarch64: Add support for aarch64-sys-regs.def
aarch64: Implement system register validation tools
aarch64: Add basic target_print_operand support for CONST_STRING
aarch64: Implement system register r/w arm ACLE intrinsic functions
aarch64: Add front-end argument type checking for target builtins
gcc/config/aarch64/aarch64-builtins.cc | 233 ++++
gcc/config/aarch64/aarch64-c.cc | 4 +-
gcc/config/aarch64/aarch64-protos.h | 5 +
gcc/config/aarch64/aarch64-sys-regs.def | 1059 +++++++++++++++++
gcc/config/aarch64/aarch64.cc | 182 +++
gcc/config/aarch64/aarch64.h | 36 +
gcc/config/aarch64/aarch64.md | 17 +
gcc/config/aarch64/arm_acle.h | 30 +
gcc/config/aarch64/predicates.md | 4 +
.../gcc.target/aarch64/acle/rwsr-1.c | 20 +
.../gcc.target/aarch64/acle/rwsr-2.c | 15 +
gcc/testsuite/gcc.target/aarch64/acle/rwsr.c | 144 +++
12 files changed, 1747 insertions(+), 2 deletions(-)
create mode 100644 gcc/config/aarch64/aarch64-sys-regs.def
create mode 100644 gcc/testsuite/gcc.target/aarch64/acle/rwsr-1.c
create mode 100644 gcc/testsuite/gcc.target/aarch64/acle/rwsr-2.c
create mode 100644 gcc/testsuite/gcc.target/aarch64/acle/rwsr.c
--
2.41.0
