From 5febf432df1cfa5b25d99b54c32103fafbdd0eb9 Mon Sep 17 00:00:00 2001 From: Miguel Ojeda Date: Sun, 16 Aug 2026 15:32:33 +0200 Subject: kbuild: rust: keep Rust objects out of Clang LTO with inline helpers Under `CONFIG_LTO_CLANG` + `CONFIG_RUST_INLINE_HELPERS`, one may hit `objtool` errors such as: vmlinux.o: error: objtool: _R..._3Gsp4boot+0xd6a: can't find jump dest instruction at .text._R..._3Gsp4boot+0x1dfd The reason is that in such builds, the Clang invocation that compiles the combined Rust plus helpers bitcode emits LLVM bitcode (again) -- the final code generation happens in the linker's LTO step, which the `-mllvm` trap options passed to Clang do not reach. This, in turn, means that unreachable traps are missing, and the impossible paths do not merely fallthrough to the next symbol, but past the end of their own section, since LTO builds place each function in its own section. Thus filter `CC_FLAGS_LTO` out of the Clang invocation, so that it always emits machine code directly, with the traps in place. Assisted-by: LLM Cc: Gary Guo Cc: Boqun Feng Cc: Alice Ryhl Cc: Matthew Maurer Cc: Josh Poimboeuf Cc: Peter Zijlstra Cc: stable@vger.kernel.org Fixes: 3a2486cc1da5 ("kbuild: rust: provide an option to inline C helpers into Rust") Acked-by: Gary Guo Link: https://patch.msgid.link/20260816133233.197500-2-ojeda@kernel.org Signed-off-by: Miguel Ojeda --- arch/microblaze/mm/init.c | 259 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 259 insertions(+) create mode 100644 arch/microblaze/mm/init.c (limited to 'arch/microblaze/mm/init.c') diff --git a/arch/microblaze/mm/init.c b/arch/microblaze/mm/init.c new file mode 100644 index 000000000..848cdee13 --- /dev/null +++ b/arch/microblaze/mm/init.c @@ -0,0 +1,259 @@ +/* + * Copyright (C) 2007-2008 Michal Simek + * Copyright (C) 2006 Atmark Techno, Inc. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include +#include +#include +#include +#include /* mem_init */ +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include + +/* Use for MMU and noMMU because of PCI generic code */ +int mem_init_done; + +char *klimit = _end; + +/* + * Initialize the bootmem system and give it all the memory we + * have available. + */ +unsigned long memory_start; +EXPORT_SYMBOL(memory_start); +unsigned long memory_size; +EXPORT_SYMBOL(memory_size); +unsigned long lowmem_size; + +EXPORT_SYMBOL(min_low_pfn); +EXPORT_SYMBOL(max_low_pfn); + +#ifdef CONFIG_HIGHMEM +static void __init highmem_init(void) +{ + pr_debug("%x\n", (u32)PKMAP_BASE); + map_page(PKMAP_BASE, 0, 0); /* XXX gross */ + pkmap_page_table = virt_to_kpte(PKMAP_BASE); +} +#endif /* CONFIG_HIGHMEM */ + +void __init arch_zone_limits_init(unsigned long *max_zone_pfns) +{ +#ifdef CONFIG_HIGHMEM + max_zone_pfns[ZONE_DMA] = max_low_pfn; + max_zone_pfns[ZONE_HIGHMEM] = max_pfn; +#else + max_zone_pfns[ZONE_DMA] = max_pfn; +#endif +} + +/* + * paging_init() sets up the page tables - in fact we've already done this. + */ +static void __init paging_init(void) +{ + int idx; + + /* Setup fixmaps */ + for (idx = 0; idx < __end_of_fixed_addresses; idx++) + clear_fixmap(idx); + +#ifdef CONFIG_HIGHMEM + highmem_init(); +#endif +} + +void __init setup_memory(void) +{ + /* + * Kernel: + * start: base phys address of kernel - page align + * end: base phys address of kernel - page align + * + * min_low_pfn - the first page (mm/bootmem.c - node_boot_start) + * max_low_pfn + */ + + /* memory start is from the kernel end (aligned) to higher addr */ + min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */ + max_low_pfn = ((u64)memory_start + (u64)lowmem_size) >> PAGE_SHIFT; + max_pfn = ((u64)memory_start + (u64)memory_size) >> PAGE_SHIFT; + + pr_info("%s: min_low_pfn: %#lx\n", __func__, min_low_pfn); + pr_info("%s: max_low_pfn: %#lx\n", __func__, max_low_pfn); + pr_info("%s: max_pfn: %#lx\n", __func__, max_pfn); + + paging_init(); +} + +void __init mem_init(void) +{ + mem_init_done = 1; +} + +int page_is_ram(unsigned long pfn) +{ + return pfn < max_low_pfn; +} + +/* + * Check for command-line options that affect what MMU_init will do. + */ +static void __init mm_cmdline_setup(void) +{ + unsigned long maxmem = 0; + char *p = cmd_line; + + /* Look for mem= option on command line */ + p = strstr(cmd_line, "mem="); + if (p) { + p += 4; + maxmem = memparse(p, &p); + if (maxmem && memory_size > maxmem) { + memory_size = maxmem; + memblock.memory.regions[0].size = memory_size; + } + } +} + +/* + * MMU_init_hw does the chip-specific initialization of the MMU hardware. + */ +static void __init mmu_init_hw(void) +{ + /* + * The Zone Protection Register (ZPR) defines how protection will + * be applied to every page which is a member of a given zone. At + * present, we utilize only two of the zones. + * The zone index bits (of ZSEL) in the PTE are used for software + * indicators, except the LSB. For user access, zone 1 is used, + * for kernel access, zone 0 is used. We set all but zone 1 + * to zero, allowing only kernel access as indicated in the PTE. + * For zone 1, we set a 01 binary (a value of 10 will not work) + * to allow user access as indicated in the PTE. This also allows + * kernel access as indicated in the PTE. + */ + __asm__ __volatile__ ("ori r11, r0, 0x10000000;" \ + "mts rzpr, r11;" + : : : "r11"); +} + +/* + * MMU_init sets up the basic memory mappings for the kernel, + * including both RAM and possibly some I/O regions, + * and sets up the page tables and the MMU hardware ready to go. + */ + +/* called from head.S */ +asmlinkage void __init mmu_init(void) +{ + unsigned int kstart, ksize; + + if ((u32) memblock.memory.regions[0].size < 0x400000) { + pr_emerg("Memory must be greater than 4MB\n"); + machine_restart(NULL); + } + + if ((u32) memblock.memory.regions[0].size < kernel_tlb) { + pr_emerg("Kernel size is greater than memory node\n"); + machine_restart(NULL); + } + + /* Find main memory where the kernel is */ + memory_start = (u32) memblock.memory.regions[0].base; + lowmem_size = memory_size = (u32) memblock.memory.regions[0].size; + + if (lowmem_size > CONFIG_LOWMEM_SIZE) { + lowmem_size = CONFIG_LOWMEM_SIZE; +#ifndef CONFIG_HIGHMEM + memory_size = lowmem_size; +#endif + } + + mm_cmdline_setup(); /* FIXME parse args from command line - not used */ + + /* + * Map out the kernel text/data/bss from the available physical + * memory. + */ + kstart = __pa(CONFIG_KERNEL_START); /* kernel start */ + /* kernel size */ + ksize = PAGE_ALIGN(((u32)_end - (u32)CONFIG_KERNEL_START)); + memblock_reserve(kstart, ksize); + +#if defined(CONFIG_BLK_DEV_INITRD) + /* Remove the init RAM disk from the available memory. */ + if (initrd_start) { + unsigned long size; + size = initrd_end - initrd_start; + memblock_reserve(__virt_to_phys(initrd_start), size); + } +#endif /* CONFIG_BLK_DEV_INITRD */ + + /* Initialize the MMU hardware */ + mmu_init_hw(); + + /* Map in all of RAM starting at CONFIG_KERNEL_START */ + mapin_ram(); + + /* Extend vmalloc and ioremap area as big as possible */ +#ifdef CONFIG_HIGHMEM + ioremap_base = ioremap_bot = PKMAP_BASE; +#else + ioremap_base = ioremap_bot = FIXADDR_START; +#endif + + /* Initialize the context management stuff */ + mmu_context_init(); + + /* Shortly after that, the entire linear mapping will be available */ + /* This will also cause that unflatten device tree will be allocated + * inside 768MB limit */ + memblock_set_current_limit(memory_start + lowmem_size - 1); + + parse_early_param(); + + early_init_fdt_scan_reserved_mem(); + + /* CMA initialization */ + dma_contiguous_reserve(memory_start + lowmem_size - 1); + + memblock_dump_all(); +} + +static const pgprot_t protection_map[16] = { + [VM_NONE] = PAGE_NONE, + [VM_READ] = PAGE_READONLY_X, + [VM_WRITE] = PAGE_COPY, + [VM_WRITE | VM_READ] = PAGE_COPY_X, + [VM_EXEC] = PAGE_READONLY, + [VM_EXEC | VM_READ] = PAGE_READONLY_X, + [VM_EXEC | VM_WRITE] = PAGE_COPY, + [VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY_X, + [VM_SHARED] = PAGE_NONE, + [VM_SHARED | VM_READ] = PAGE_READONLY_X, + [VM_SHARED | VM_WRITE] = PAGE_SHARED, + [VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED_X, + [VM_SHARED | VM_EXEC] = PAGE_READONLY, + [VM_SHARED | VM_EXEC | VM_READ] = PAGE_READONLY_X, + [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED, + [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED_X +}; +DECLARE_VM_GET_PAGE_PROT -- cgit v1.3.1