I took the documentation of the FRAME_GROWS_DOWNWARD behaviour from the version that was in most header files, since the one in the manual seemed less clear.
The patch deliberately keeps FIRST_PARM_OFFSET(FNDECL) in microblaze_starting_frame_offset; this seems to be a port-local convention and takes advantage of the fact that FIRST_PARM_OFFSET doesn't read FNDECL. Tested on aarch64-linux-gnu, x86_64-linux-gnu and powerpc64le-linux-gnu. Also tested on at least one target per CPU directory. Commmitted as pre-approved by Jeff here: https://gcc.gnu.org/ml/gcc-patches/2017-09/msg00923.html Richard 2017-10-23 Richard Sandiford <richard.sandif...@linaro.org> gcc/ * target.def (starting_frame_offset): New hook. * doc/tm.texi (STARTING_FRAME_OFFSET): Remove in favor of... (TARGET_STARTING_FRAME_OFFSET): ...this new hook. * doc/tm.texi.in: Regenerate. * hooks.h (hook_hwi_void_0): Declare. * hooks.c (hook_hwi_void_0): New function. * doc/rtl.texi: Refer to TARGET_STARTING_FRAME_OFFSET instead of STARTING_FRAME_OFFSET. * builtins.c (expand_builtin_setjmp_receiver): Likewise. * reload1.c (reload): Likewise. * cfgexpand.c (expand_used_vars): Use targetm.starting_frame_offset instead of STARTING_FRAME_OFFSET. * function.c (try_fit_stack_local): Likewise. (assign_stack_local_1): Likewise (instantiate_virtual_regs): Likewise. * rtlanal.c (rtx_addr_can_trap_p_1): Likewise. * config/avr/avr.md (nonlocal_goto_receiver): Likewise. * config/aarch64/aarch64.h (STARTING_FRAME_OFFSET): Delete. * config/alpha/alpha.h (STARTING_FRAME_OFFSET): Likewise. * config/arc/arc.h (STARTING_FRAME_OFFSET): Likewise. * config/arm/arm.h (STARTING_FRAME_OFFSET): Likewise. * config/bfin/bfin.h (STARTING_FRAME_OFFSET): Likewise. * config/c6x/c6x.h (STARTING_FRAME_OFFSET): Likewise. * config/cr16/cr16.h (STARTING_FRAME_OFFSET): Likewise. * config/cris/cris.h (STARTING_FRAME_OFFSET): Likewise. * config/fr30/fr30.h (STARTING_FRAME_OFFSET): Likewise. * config/frv/frv.h (STARTING_FRAME_OFFSET): Likewise. * config/ft32/ft32.h (STARTING_FRAME_OFFSET): Likewise. * config/h8300/h8300.h (STARTING_FRAME_OFFSET): Likewise. * config/i386/i386.h (STARTING_FRAME_OFFSET): Likewise. * config/ia64/ia64.h (STARTING_FRAME_OFFSET): Likewise. * config/m32c/m32c.h (STARTING_FRAME_OFFSET): Likewise. * config/m68k/m68k.h (STARTING_FRAME_OFFSET): Likewise. * config/mcore/mcore.h (STARTING_FRAME_OFFSET): Likewise. * config/mn10300/mn10300.h (STARTING_FRAME_OFFSET): Likewise. * config/moxie/moxie.h (STARTING_FRAME_OFFSET): Likewise. * config/msp430/msp430.h (STARTING_FRAME_OFFSET): Likewise. * config/nds32/nds32.h (STARTING_FRAME_OFFSET): Likewise. * config/nios2/nios2.h (STARTING_FRAME_OFFSET): Likewise. * config/nvptx/nvptx.h (STARTING_FRAME_OFFSET): Likewise. * config/pdp11/pdp11.h (STARTING_FRAME_OFFSET): Likewise. * config/riscv/riscv.h (STARTING_FRAME_OFFSET): Likewise. * config/rl78/rl78.h (STARTING_FRAME_OFFSET): Likewise. * config/rx/rx.h (STARTING_FRAME_OFFSET): Likewise. * config/s390/s390.h (STARTING_FRAME_OFFSET): Likewise. * config/sh/sh.h (STARTING_FRAME_OFFSET): Likewise. * config/sparc/sparc.c (sparc_compute_frame_size): Likewise. * config/sparc/sparc.h (STARTING_FRAME_OFFSET): Likewise. * config/spu/spu.h (STARTING_FRAME_OFFSET): Likewise. * config/stormy16/stormy16.h (STARTING_FRAME_OFFSET): Likewise. * config/tilegx/tilegx.h (STARTING_FRAME_OFFSET): Likewise. * config/tilepro/tilepro.h (STARTING_FRAME_OFFSET): Likewise. * config/v850/v850.h (STARTING_FRAME_OFFSET): Likewise. * config/visium/visium.h (STARTING_FRAME_OFFSET): Likewise. * config/avr/avr.h (STARTING_FRAME_OFFSET): Likewise. * config/avr/avr-protos.h (avr_starting_frame_offset): Likewise. * config/avr/avr.c (avr_starting_frame_offset): Make static and return a HOST_WIDE_INT. (avr_builtin_setjmp_frame_value): Use it instead of STARTING_FRAME_OFFSET. (TARGET_STARTING_FRAME_OFFSET): Redefine. * config/epiphany/epiphany.h (STARTING_FRAME_OFFSET): Delete. * config/epiphany/epiphany.c (epiphany_starting_frame_offset): New function. (TARGET_STARTING_FRAME_OFFSET): Redefine. * config/iq2000/iq2000.h (STARTING_FRAME_OFFSET): Delete. * config/iq2000/iq2000.c (iq2000_starting_frame_offset): New function. (TARGET_CONSTANT_ALIGNMENT): Redefine. * config/lm32/lm32.h (STARTING_FRAME_OFFSET): Delete. * config/lm32/lm32.c (lm32_starting_frame_offset): New function. (TARGET_STARTING_FRAME_OFFSET): Redefine. * config/m32r/m32r.h (STARTING_FRAME_OFFSET): Delete. * config/m32r/m32r.c (m32r_starting_frame_offset): New function. (TARGET_STARTING_FRAME_OFFSET): Redefine. * config/microblaze/microblaze.h (STARTING_FRAME_OFFSET): Delete. * config/microblaze/microblaze.c (microblaze_starting_frame_offset): New function. (TARGET_STARTING_FRAME_OFFSET): Redefine. * config/mips/mips.h (STARTING_FRAME_OFFSET): Delete. * config/mips/mips.c (mips_compute_frame_info): Refer to TARGET_STARTING_FRAME_OFFSET instead of STARTING_FRAME_OFFSET. (mips_starting_frame_offset): New function. (TARGET_STARTING_FRAME_OFFSET): Redefine. * config/mmix/mmix.h (STARTING_FRAME_OFFSET): Delete. * config/mmix/mmix-protos.h (mmix_starting_frame_offset): Delete. * config/mmix/mmix.c (mmix_starting_frame_offset): Make static and return a HOST_WIDE_INT. (TARGET_STARTING_FRAME_OFFSET): Redefine. (mmix_initial_elimination_offset): Refer to TARGET_STARTING_FRAME_OFFSET instead of STARTING_FRAME_OFFSET. * config/pa/pa.h (STARTING_FRAME_OFFSET): Delete. * config/pa/pa.c (pa_starting_frame_offset): New function. (pa_compute_frame_size): Use it instead of STARTING_FRAME_OFFSET. (pa_expand_prologue): Likewise. (TARGET_STARTING_FRAME_OFFSET): Redefine. * config/powerpcspe/aix.h (STARTING_FRAME_OFFSET): Split out !FRAME_GROWS_DOWNWARD handling to... (RS6000_STARTING_FRAME_OFFSET): ...this new macro. * config/powerpcspe/darwin.h (STARTING_FRAME_OFFSET): Split out !FRAME_GROWS_DOWNWARD handling to... (RS6000_STARTING_FRAME_OFFSET): ...this new macro. * config/powerpcspe/powerpcspe.h (STARTING_FRAME_OFFSET): Split out !FRAME_GROWS_DOWNWARD handling to... (RS6000_STARTING_FRAME_OFFSET): ...this new macro. * config/powerpcspe/powerpcspe.c (TARGET_STARTING_FRAME_OFFSET): Redefine. (rs6000_starting_frame_offset): New function. * config/rs6000/aix.h (STARTING_FRAME_OFFSET): Split out !FRAME_GROWS_DOWNWARD handling to... (RS6000_STARTING_FRAME_OFFSET): ...this new macro. * config/rs6000/darwin.h (STARTING_FRAME_OFFSET): Split out !FRAME_GROWS_DOWNWARD handling to... (RS6000_STARTING_FRAME_OFFSET): ...this new macro. * config/rs6000/rs6000.h (STARTING_FRAME_OFFSET): Split out !FRAME_GROWS_DOWNWARD handling to... (RS6000_STARTING_FRAME_OFFSET): ...this new macro. * config/rs6000/rs6000.c (TARGET_STARTING_FRAME_OFFSET): Refine. (rs6000_starting_frame_offset): New function. * config/vax/elf.h (STARTING_FRAME_OFFSET): Delete. * config/vax/vax.h (STARTING_FRAME_OFFSET): Delete. * config/vax/vax.c (vax_starting_frame_offset): New function. (vax_expand_prologue): Use it instead of STARTING_FRAME_OFFSET. (TARGET_STARTING_FRAME_OFFSET): Redefine. * config/xtensa/xtensa.h (STARTING_FRAME_OFFSET): Delete. * config/xtensa/xtensa.c (xtensa_starting_frame_offset): New function. (TARGET_STARTING_FRAME_OFFSET): Redefine. * system.h (STARTING_FRAME_OFFSET): Poison.
