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author | Jim Wilson <jimw@sifive.com> | 2018-05-25 22:29:17 +0000 |
---|---|---|
committer | Jim Wilson <wilson@gcc.gnu.org> | 2018-05-25 15:29:17 -0700 |
commit | d0ebdd9fce00f5fbfec615d72f1dedf0cd7762a6 (patch) | |
tree | fd44a708cc3f3ebbd9eab6e79f8573f972a67663 /gcc/doc | |
parent | c0e8f02b27afc1a07f30a7597f8ae34094821f9d (diff) | |
download | gcc-d0ebdd9fce00f5fbfec615d72f1dedf0cd7762a6.zip gcc-d0ebdd9fce00f5fbfec615d72f1dedf0cd7762a6.tar.gz gcc-d0ebdd9fce00f5fbfec615d72f1dedf0cd7762a6.tar.bz2 |
RISC-V: Add interrupt attribute support.
gcc/
* config/riscv/riscv-protos.h (riscv_epilogue_uses): New.
* config/riscv/riscv.c (struct machine_function): Add
interrupt_handler_p and attribute_checked_p fields.
(riscv_attribute_table): Add interrupt.
(riscv_interrupt_type_p): New.
(riscv_save_reg_p): Save extra regs for interrupt handler.
(riscv_use_save_libcall): Return false for interrupt handler.
(riscv_first_stack_step): Add forward declaration.
(riscv_compute_frame_info): New local interrupt_save_t1. Set it
for interrupt handler with large frame. Use it for saved reg list.
(riscv_expand_prologue): Move flag_stack_usage_info support to
eliminate duplication.
(riscv_expand_epilogue): Generate mret for interrupt handler.
(riscv_epilogue_uses): New.
(riscv_can_use_return_insn): Return false for interrupt handler.
(riscv_function_ok_for_sibcall): Likewise.
(riscv_set_current_function): Add interrupt handler support.
* config/riscv/riscv.h (EPILOGUE_USES): Call riscv_epilogue_uses.
* config/riscv/riscv.md (UNSPECV_MRET): New.
(GP_REGNUM): New.
(riscv_frflags, riscv_fsflags): Use tab after opcode.
(riscv_mret): New.
* doc/extend.texi (RISC-V Function Attributes) <interrupt>: New.
gcc/testsuite/
* gcc.target/riscv/interrupt-1.c: New.
* gcc.target/riscv/interrupt-2.c: New.
* gcc.target/riscv/interrupt-3.c: New.
* gcc.target/riscv/interrupt-4.c: New.
* gcc.target/riscv/interrupt-5.c: New.
From-SVN: r260785
Diffstat (limited to 'gcc/doc')
-rw-r--r-- | gcc/doc/extend.texi | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi index 942548f..c6d23b5 100644 --- a/gcc/doc/extend.texi +++ b/gcc/doc/extend.texi @@ -5141,6 +5141,12 @@ prologue/epilogue sequences generated by the compiler. Only basic (@pxref{Basic Asm}). While using extended @code{asm} or a mixture of basic @code{asm} and C code may appear to work, they cannot be depended upon to work reliably and are not supported. + +@item interrupt +@cindex @code{interrupt} function attribute, RISC-V +Use this attribute to indicate that the specified function is an interrupt +handler. The compiler generates function entry and exit sequences suitable +for use in an interrupt handler when this attribute is present. @end table @node RL78 Function Attributes |