summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kernel/module.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--arch/powerpc/kernel/module.c127
1 files changed, 127 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/module.c b/arch/powerpc/kernel/module.c
new file mode 100644
index 000000000..f6d6ae0a1
--- /dev/null
+++ b/arch/powerpc/kernel/module.c
@@ -0,0 +1,127 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Kernel module help for powerpc.
+ Copyright (C) 2001, 2003 Rusty Russell IBM Corporation.
+ Copyright (C) 2008 Freescale Semiconductor, Inc.
+
+*/
+#include <linux/elf.h>
+#include <linux/moduleloader.h>
+#include <linux/err.h>
+#include <linux/vmalloc.h>
+#include <linux/mm.h>
+#include <linux/bug.h>
+#include <asm/module.h>
+#include <linux/uaccess.h>
+#include <asm/firmware.h>
+#include <linux/sort.h>
+#include <asm/setup.h>
+#include <asm/sections.h>
+
+static LIST_HEAD(module_bug_list);
+
+static const Elf_Shdr *find_section(const Elf_Ehdr *hdr,
+ const Elf_Shdr *sechdrs,
+ const char *name)
+{
+ char *secstrings;
+ unsigned int i;
+
+ secstrings = (char *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
+ for (i = 1; i < hdr->e_shnum; i++)
+ if (strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
+ return &sechdrs[i];
+ return NULL;
+}
+
+int module_finalize(const Elf_Ehdr *hdr,
+ const Elf_Shdr *sechdrs, struct module *me)
+{
+ const Elf_Shdr *sect;
+ int rc;
+
+ rc = module_finalize_ftrace(me, sechdrs);
+ if (rc)
+ return rc;
+
+ /* Apply feature fixups */
+ sect = find_section(hdr, sechdrs, "__ftr_fixup");
+ if (sect != NULL)
+ do_feature_fixups(cur_cpu_spec->cpu_features,
+ (void *)sect->sh_addr,
+ (void *)sect->sh_addr + sect->sh_size);
+
+ sect = find_section(hdr, sechdrs, "__mmu_ftr_fixup");
+ if (sect != NULL)
+ do_feature_fixups(cur_cpu_spec->mmu_features,
+ (void *)sect->sh_addr,
+ (void *)sect->sh_addr + sect->sh_size);
+
+#ifdef CONFIG_PPC64
+ sect = find_section(hdr, sechdrs, "__fw_ftr_fixup");
+ if (sect != NULL)
+ do_feature_fixups(powerpc_firmware_features,
+ (void *)sect->sh_addr,
+ (void *)sect->sh_addr + sect->sh_size);
+#endif /* CONFIG_PPC64 */
+
+#ifdef CONFIG_PPC64_ELF_ABI_V1
+ sect = find_section(hdr, sechdrs, ".opd");
+ if (sect != NULL) {
+ me->arch.start_opd = sect->sh_addr;
+ me->arch.end_opd = sect->sh_addr + sect->sh_size;
+ }
+#endif /* CONFIG_PPC64_ELF_ABI_V1 */
+
+#ifdef CONFIG_PPC_BARRIER_NOSPEC
+ sect = find_section(hdr, sechdrs, "__spec_barrier_fixup");
+ if (sect != NULL)
+ do_barrier_nospec_fixups_range(barrier_nospec_enabled,
+ (void *)sect->sh_addr,
+ (void *)sect->sh_addr + sect->sh_size);
+#endif /* CONFIG_PPC_BARRIER_NOSPEC */
+
+ sect = find_section(hdr, sechdrs, "__lwsync_fixup");
+ if (sect != NULL)
+ do_lwsync_fixups(cur_cpu_spec->cpu_features,
+ (void *)sect->sh_addr,
+ (void *)sect->sh_addr + sect->sh_size);
+
+ return 0;
+}
+
+static __always_inline void *
+__module_alloc(unsigned long size, unsigned long start, unsigned long end, bool nowarn)
+{
+ pgprot_t prot = strict_module_rwx_enabled() ? PAGE_KERNEL : PAGE_KERNEL_EXEC;
+ gfp_t gfp = GFP_KERNEL | (nowarn ? __GFP_NOWARN : 0);
+
+ /*
+ * Don't do huge page allocations for modules yet until more testing
+ * is done. STRICT_MODULE_RWX may require extra work to support this
+ * too.
+ */
+ return __vmalloc_node_range(size, 1, start, end, gfp, prot,
+ VM_FLUSH_RESET_PERMS,
+ NUMA_NO_NODE, __builtin_return_address(0));
+}
+
+void *module_alloc(unsigned long size)
+{
+#ifdef MODULES_VADDR
+ unsigned long limit = (unsigned long)_etext - SZ_32M;
+ void *ptr = NULL;
+
+ BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR);
+
+ /* First try within 32M limit from _etext to avoid branch trampolines */
+ if (MODULES_VADDR < PAGE_OFFSET && MODULES_END > limit)
+ ptr = __module_alloc(size, limit, MODULES_END, true);
+
+ if (!ptr)
+ ptr = __module_alloc(size, MODULES_VADDR, MODULES_END, false);
+
+ return ptr;
+#else
+ return __module_alloc(size, VMALLOC_START, VMALLOC_END, false);
+#endif
+}