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Message-Id: <20250325121624.523258-3-guoren@kernel.org> Date: Tue, 25 Mar 2025 08:15:43 -0400 From: guoren@...nel.org To: arnd@...db.de, gregkh@...uxfoundation.org, torvalds@...ux-foundation.org, paul.walmsley@...ive.com, palmer@...belt.com, anup@...infault.org, atishp@...shpatra.org, oleg@...hat.com, kees@...nel.org, tglx@...utronix.de, will@...nel.org, mark.rutland@....com, brauner@...nel.org, akpm@...ux-foundation.org, rostedt@...dmis.org, edumazet@...gle.com, unicorn_wang@...look.com, inochiama@...look.com, gaohan@...as.ac.cn, shihua@...as.ac.cn, jiawei@...as.ac.cn, wuwei2016@...as.ac.cn, drew@...7.com, prabhakar.mahadev-lad.rj@...renesas.com, ctsai390@...estech.com, wefu@...hat.com, kuba@...nel.org, pabeni@...hat.com, josef@...icpanda.com, dsterba@...e.com, mingo@...hat.com, peterz@...radead.org, boqun.feng@...il.com, guoren@...nel.org, xiao.w.wang@...el.com, qingfang.deng@...lower.com.cn, leobras@...hat.com, jszhang@...nel.org, conor.dooley@...rochip.com, samuel.holland@...ive.com, yongxuan.wang@...ive.com, luxu.kernel@...edance.com, david@...hat.com, ruanjinjie@...wei.com, cuiyunhui@...edance.com, wangkefeng.wang@...wei.com, qiaozhe@...as.ac.cn Cc: ardb@...nel.org, ast@...nel.org, linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org, kvm@...r.kernel.org, kvm-riscv@...ts.infradead.org, linux-mm@...ck.org, linux-crypto@...r.kernel.org, bpf@...r.kernel.org, linux-input@...r.kernel.org, linux-perf-users@...r.kernel.org, linux-serial@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-arch@...r.kernel.org, maple-tree@...ts.infradead.org, linux-trace-kernel@...r.kernel.org, netdev@...r.kernel.org, linux-atm-general@...ts.sourceforge.net, linux-btrfs@...r.kernel.org, netfilter-devel@...r.kernel.org, coreteam@...filter.org, linux-nfs@...r.kernel.org, linux-sctp@...r.kernel.org, linux-usb@...r.kernel.org, linux-media@...r.kernel.org Subject: [RFC PATCH V3 02/43] rv64ilp32_abi: riscv: Adapt Makefile and Kconfig From: "Guo Ren (Alibaba DAMO Academy)" <guoren@...nel.org> Extend the ARCH_RV64I base with ABI_RV64ILP32 to compile the Linux kernel self into ILP32 on CONFIG_64BIT=y, minimizing the kernel's memory footprint and cache occupation. The 'cmd_cpp_lds_S' in scripts/Makefile.build uses cpp_flags for ld.s generation, so add "-mabi=xxx" to KBUILD_CPPFLAGS, just like what we've done in KBUILD_CLFAGS and KBUILD_AFLAGS. cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) The rv64ilp32 ABI reuses an rv64 toolchain whose default "-mabi=" is lp64, so add "-mabi=ilp32" to correct it. Add config entry with rv64ilp32.config fragment in Makefile: - rv64ilp32_defconfig Signed-off-by: Guo Ren (Alibaba DAMO Academy) <guoren@...nel.org> --- arch/riscv/Kconfig | 12 ++++++++++-- arch/riscv/Makefile | 17 +++++++++++++++++ arch/riscv/configs/rv64ilp32.config | 1 + 3 files changed, 28 insertions(+), 2 deletions(-) create mode 100644 arch/riscv/configs/rv64ilp32.config diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 7612c52e9b1e..da2111b0111c 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -213,7 +213,7 @@ config RISCV select TRACE_IRQFLAGS_SUPPORT select UACCESS_MEMCPY if !MMU select USER_STACKTRACE_SUPPORT - select ZONE_DMA32 if 64BIT + select ZONE_DMA32 if 64BIT && !ABI_RV64ILP32 config RUSTC_SUPPORTS_RISCV def_bool y @@ -298,6 +298,7 @@ config PAGE_OFFSET config KASAN_SHADOW_OFFSET hex depends on KASAN_GENERIC + default 0x70000000 if ABI_RV64ILP32 default 0xdfffffff00000000 if 64BIT default 0xffffffff if 32BIT @@ -341,7 +342,7 @@ config FIX_EARLYCON_MEM config ILLEGAL_POINTER_VALUE hex - default 0 if 32BIT + default 0 if 32BIT || ABI_RV64ILP32 default 0xdead000000000000 if 64BIT config PGTABLE_LEVELS @@ -418,6 +419,13 @@ config ARCH_RV64I endchoice +config ABI_RV64ILP32 + bool "ABI RV64ILP32" + depends on 64BIT + help + Compile linux kernel self into RV64ILP32 ABI of RISC-V psabi + specification. + # We must be able to map all physical memory into the kernel, but the compiler # is still a bit more efficient when generating code if it's setup in a manner # such that it can only map 2GiB of memory. diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile index 13fbc0f94238..76db01020a22 100644 --- a/arch/riscv/Makefile +++ b/arch/riscv/Makefile @@ -30,10 +30,21 @@ ifeq ($(CONFIG_ARCH_RV64I),y) BITS := 64 UTS_MACHINE := riscv64 +ifeq ($(CONFIG_ABI_RV64ILP32),y) + KBUILD_CPPFLAGS += -mabi=ilp32 + + KBUILD_CFLAGS += -mabi=ilp32 + KBUILD_AFLAGS += -mabi=ilp32 + + KBUILD_LDFLAGS += -melf32lriscv +else + KBUILD_CPPFLAGS += -mabi=lp64 + KBUILD_CFLAGS += -mabi=lp64 KBUILD_AFLAGS += -mabi=lp64 KBUILD_LDFLAGS += -melf64lriscv +endif KBUILD_RUSTFLAGS += -Ctarget-cpu=generic-rv64 --target=riscv64imac-unknown-none-elf \ -Cno-redzone @@ -41,6 +52,8 @@ else BITS := 32 UTS_MACHINE := riscv32 + KBUILD_CPPFLAGS += -mabi=ilp32 + KBUILD_CFLAGS += -mabi=ilp32 KBUILD_AFLAGS += -mabi=ilp32 KBUILD_LDFLAGS += -melf32lriscv @@ -224,6 +237,10 @@ PHONY += rv32_nommu_virt_defconfig rv32_nommu_virt_defconfig: $(Q)$(MAKE) -f $(srctree)/Makefile nommu_virt_defconfig 32-bit.config +PHONY += rv64ilp32_defconfig +rv64ilp32_defconfig: + $(Q)$(MAKE) -f $(srctree)/Makefile defconfig rv64ilp32.config + define archhelp echo ' Image - Uncompressed kernel image (arch/riscv/boot/Image)' echo ' Image.gz - Compressed kernel image (arch/riscv/boot/Image.gz)' diff --git a/arch/riscv/configs/rv64ilp32.config b/arch/riscv/configs/rv64ilp32.config new file mode 100644 index 000000000000..07536586e169 --- /dev/null +++ b/arch/riscv/configs/rv64ilp32.config @@ -0,0 +1 @@ +CONFIG_ABI_RV64ILP32=y -- 2.40.1
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