diff options
| author | Vineet Gupta <vgupta@kernel.org> | 2020-05-12 22:18:08 -0700 |
|---|---|---|
| committer | Vineet Gupta <vgupta@kernel.org> | 2023-08-17 20:31:59 -0700 |
| commit | cfca4b5abe0cc13f9d9f45f760efd8260e31200f (patch) | |
| tree | bac7d51b9a322dbb17a9428c87aeae26aa5678ef /arch/arc/Makefile | |
| parent | fad84e39f116035ae8d550c6020107b8ac113b45 (diff) | |
ARC: entry: use gp to cache task pointer (vs. r25)
The motivation is eventual ABI considerations for ARCv3 but even without
it this change us worthwhile as diffstat reduces 100 net lines
r25 is a callee saved register, normally not saved by entry code in
pt_regs. However because of its usage in CONFIG_ARC_CURR_IN_REG it needs
to be. This in turn requires a whole bunch of special casing when we
need to access r25. Then there is distinction between user mode r25 vs.
kernel mode r25 - hence distinct SAVE_CALLEE_SAVED_{USER,KERNEL}
Instead use gp which is a scratch register and thus saved already in entry
code. This cleans things up significantly and much nocer on eyes:
- SAVE_CALLEE_SAVED_{USER,KERNEL} are now exactly same
- no special user_r25 slot in pt_reggs
Note that typical global asm registers are callee-saved (r25), but gp is
not callee-saved thus needs additional -ffixed-<reg> toggle
Signed-off-by: Vineet Gupta <vgupta@kernel.org>
Diffstat (limited to 'arch/arc/Makefile')
| -rw-r--r-- | arch/arc/Makefile | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/arc/Makefile b/arch/arc/Makefile index 329400a1c355..2390dd042e36 100644 --- a/arch/arc/Makefile +++ b/arch/arc/Makefile @@ -28,14 +28,14 @@ cflags-y += $(tune-mcpu-def-y) endif endif - ifdef CONFIG_ARC_CURR_IN_REG # For a global register definition, make sure it gets passed to every file # We had a customer reported bug where some code built in kernel was NOT using -# any kernel headers, and missing the r25 global register +# any kernel headers, and missing the global register # Can't do unconditionally because of recursive include issues # due to <linux/thread_info.h> LINUXINCLUDE += -include $(srctree)/arch/arc/include/asm/current.h +cflags-y += -ffixed-gp endif cflags-y += -fsection-anchors @@ -67,7 +67,7 @@ cflags-$(CONFIG_ARC_DW2_UNWIND) += -fasynchronous-unwind-tables $(cfi) # small data is default for elf32 tool-chain. If not usable, disable it # This also allows repurposing GP as scratch reg to gcc reg allocator disable_small_data := y -cflags-$(disable_small_data) += -mno-sdata -fcall-used-gp +cflags-$(disable_small_data) += -mno-sdata cflags-$(CONFIG_CPU_BIG_ENDIAN) += -mbig-endian ldflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB |