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-rw-r--r--arch/loongarch/kernel/module.c204
1 files changed, 150 insertions, 54 deletions
diff --git a/arch/loongarch/kernel/module.c b/arch/loongarch/kernel/module.c
index 36d6d9eeb7c7..7d4d571ee55e 100644
--- a/arch/loongarch/kernel/module.c
+++ b/arch/loongarch/kernel/module.c
@@ -22,72 +22,89 @@
#include <asm/inst.h>
#include <asm/unwind.h>
-static int rela_stack_push(s64 stack_value, s64 *rela_stack, size_t *rela_stack_top)
+/*
+ * reloc_rela_handler() - Apply a particular relocation to a module
+ * @mod: the module to apply the reloc to
+ * @location: the address at which the reloc is to be applied
+ * @v: the value of the reloc, with addend for RELA-style
+ * @rela_stack: the stack used for store relocation info, LOCAL to THIS module
+ * @rela_stac_top: where the stack operation(pop/push) applies to
+ *
+ * Return: 0 upon success, else -ERRNO
+ */
+typedef int (*reloc_rela_handler)(struct module *mod, u32 *location, Elf_Addr v,
+ long *rela_stack, size_t *rela_stack_top, unsigned int type);
+
+static int rela_stack_push(long stack_value, long *rela_stack, size_t *rela_stack_top)
{
if (*rela_stack_top >= RELA_STACK_DEPTH)
return -ENOEXEC;
rela_stack[(*rela_stack_top)++] = stack_value;
- pr_debug("%s stack_value = 0x%llx\n", __func__, stack_value);
+ pr_debug("%s stack_value = 0x%lx\n", __func__, stack_value);
return 0;
}
-static int rela_stack_pop(s64 *stack_value, s64 *rela_stack, size_t *rela_stack_top)
+static int rela_stack_pop(long *stack_value, long *rela_stack, size_t *rela_stack_top)
{
if (*rela_stack_top == 0)
return -ENOEXEC;
*stack_value = rela_stack[--(*rela_stack_top)];
- pr_debug("%s stack_value = 0x%llx\n", __func__, *stack_value);
+ pr_debug("%s stack_value = 0x%lx\n", __func__, *stack_value);
return 0;
}
static int apply_r_larch_none(struct module *mod, u32 *location, Elf_Addr v,
- s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
+ long *rela_stack, size_t *rela_stack_top, unsigned int type)
{
return 0;
}
static int apply_r_larch_error(struct module *me, u32 *location, Elf_Addr v,
- s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
+ long *rela_stack, size_t *rela_stack_top, unsigned int type)
{
pr_err("%s: Unsupport relocation type %u, please add its support.\n", me->name, type);
return -EINVAL;
}
static int apply_r_larch_32(struct module *mod, u32 *location, Elf_Addr v,
- s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
+ long *rela_stack, size_t *rela_stack_top, unsigned int type)
{
*location = v;
return 0;
}
+#ifdef CONFIG_32BIT
+#define apply_r_larch_64 apply_r_larch_error
+#else
static int apply_r_larch_64(struct module *mod, u32 *location, Elf_Addr v,
- s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
+ long *rela_stack, size_t *rela_stack_top, unsigned int type)
{
*(Elf_Addr *)location = v;
return 0;
}
+#endif
static int apply_r_larch_sop_push_pcrel(struct module *mod, u32 *location, Elf_Addr v,
- s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
+ long *rela_stack, size_t *rela_stack_top, unsigned int type)
{
- return rela_stack_push(v - (u64)location, rela_stack, rela_stack_top);
+ return rela_stack_push(v - (unsigned long)location, rela_stack, rela_stack_top);
}
static int apply_r_larch_sop_push_absolute(struct module *mod, u32 *location, Elf_Addr v,
- s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
+ long *rela_stack, size_t *rela_stack_top, unsigned int type)
{
return rela_stack_push(v, rela_stack, rela_stack_top);
}
static int apply_r_larch_sop_push_dup(struct module *mod, u32 *location, Elf_Addr v,
- s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
+ long *rela_stack, size_t *rela_stack_top, unsigned int type)
{
int err = 0;
- s64 opr1;
+ long opr1;
err = rela_stack_pop(&opr1, rela_stack, rela_stack_top);
if (err)
@@ -104,7 +121,7 @@ static int apply_r_larch_sop_push_dup(struct module *mod, u32 *location, Elf_Add
static int apply_r_larch_sop_push_plt_pcrel(struct module *mod,
Elf_Shdr *sechdrs, u32 *location, Elf_Addr v,
- s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
+ long *rela_stack, size_t *rela_stack_top, unsigned int type)
{
ptrdiff_t offset = (void *)v - (void *)location;
@@ -118,10 +135,10 @@ static int apply_r_larch_sop_push_plt_pcrel(struct module *mod,
}
static int apply_r_larch_sop(struct module *mod, u32 *location, Elf_Addr v,
- s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
+ long *rela_stack, size_t *rela_stack_top, unsigned int type)
{
int err = 0;
- s64 opr1, opr2, opr3;
+ long opr1, opr2, opr3;
if (type == R_LARCH_SOP_IF_ELSE) {
err = rela_stack_pop(&opr3, rela_stack, rela_stack_top);
@@ -164,10 +181,10 @@ static int apply_r_larch_sop(struct module *mod, u32 *location, Elf_Addr v,
}
static int apply_r_larch_sop_imm_field(struct module *mod, u32 *location, Elf_Addr v,
- s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
+ long *rela_stack, size_t *rela_stack_top, unsigned int type)
{
int err = 0;
- s64 opr1;
+ long opr1;
union loongarch_instruction *insn = (union loongarch_instruction *)location;
err = rela_stack_pop(&opr1, rela_stack, rela_stack_top);
@@ -244,31 +261,33 @@ static int apply_r_larch_sop_imm_field(struct module *mod, u32 *location, Elf_Ad
}
overflow:
- pr_err("module %s: opr1 = 0x%llx overflow! dangerous %s (%u) relocation\n",
+ pr_err("module %s: opr1 = 0x%lx overflow! dangerous %s (%u) relocation\n",
mod->name, opr1, __func__, type);
return -ENOEXEC;
unaligned:
- pr_err("module %s: opr1 = 0x%llx unaligned! dangerous %s (%u) relocation\n",
+ pr_err("module %s: opr1 = 0x%lx unaligned! dangerous %s (%u) relocation\n",
mod->name, opr1, __func__, type);
return -ENOEXEC;
}
static int apply_r_larch_add_sub(struct module *mod, u32 *location, Elf_Addr v,
- s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
+ long *rela_stack, size_t *rela_stack_top, unsigned int type)
{
switch (type) {
case R_LARCH_ADD32:
*(s32 *)location += v;
return 0;
- case R_LARCH_ADD64:
- *(s64 *)location += v;
- return 0;
case R_LARCH_SUB32:
*(s32 *)location -= v;
return 0;
+#ifdef CONFIG_64BIT
+ case R_LARCH_ADD64:
+ *(s64 *)location += v;
+ return 0;
case R_LARCH_SUB64:
*(s64 *)location -= v;
+#endif
return 0;
default:
pr_err("%s: Unsupport relocation type %u\n", mod->name, type);
@@ -278,7 +297,7 @@ static int apply_r_larch_add_sub(struct module *mod, u32 *location, Elf_Addr v,
static int apply_r_larch_b26(struct module *mod,
Elf_Shdr *sechdrs, u32 *location, Elf_Addr v,
- s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
+ long *rela_stack, size_t *rela_stack_top, unsigned int type)
{
ptrdiff_t offset = (void *)v - (void *)location;
union loongarch_instruction *insn = (union loongarch_instruction *)location;
@@ -310,15 +329,40 @@ static int apply_r_larch_b26(struct module *mod,
return 0;
}
+static int apply_r_larch_pcadd(struct module *mod, u32 *location, Elf_Addr v,
+ long *rela_stack, size_t *rela_stack_top, unsigned int type)
+{
+ union loongarch_instruction *insn = (union loongarch_instruction *)location;
+ /* Use s32 for a sign-extension deliberately. */
+ s32 offset_hi20 = (void *)((v + 0x800)) - (void *)((Elf_Addr)location);
+
+ switch (type) {
+ case R_LARCH_PCADD_LO12:
+ insn->reg2i12_format.immediate = v & 0xfff;
+ break;
+ case R_LARCH_PCADD_HI20:
+ v = offset_hi20 >> 12;
+ insn->reg1i20_format.immediate = v & 0xfffff;
+ break;
+ default:
+ pr_err("%s: Unsupport relocation type %u\n", mod->name, type);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static int apply_r_larch_pcala(struct module *mod, u32 *location, Elf_Addr v,
- s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
+ long *rela_stack, size_t *rela_stack_top, unsigned int type)
{
union loongarch_instruction *insn = (union loongarch_instruction *)location;
/* Use s32 for a sign-extension deliberately. */
s32 offset_hi20 = (void *)((v + 0x800) & ~0xfff) -
(void *)((Elf_Addr)location & ~0xfff);
+#ifdef CONFIG_64BIT
Elf_Addr anchor = (((Elf_Addr)location) & ~0xfff) + offset_hi20;
ptrdiff_t offset_rem = (void *)v - (void *)anchor;
+#endif
switch (type) {
case R_LARCH_PCALA_LO12:
@@ -328,6 +372,7 @@ static int apply_r_larch_pcala(struct module *mod, u32 *location, Elf_Addr v,
v = offset_hi20 >> 12;
insn->reg1i20_format.immediate = v & 0xfffff;
break;
+#ifdef CONFIG_64BIT
case R_LARCH_PCALA64_LO20:
v = offset_rem >> 32;
insn->reg1i20_format.immediate = v & 0xfffff;
@@ -336,6 +381,7 @@ static int apply_r_larch_pcala(struct module *mod, u32 *location, Elf_Addr v,
v = offset_rem >> 52;
insn->reg2i12_format.immediate = v & 0xfff;
break;
+#endif
default:
pr_err("%s: Unsupport relocation type %u\n", mod->name, type);
return -EINVAL;
@@ -346,30 +392,43 @@ static int apply_r_larch_pcala(struct module *mod, u32 *location, Elf_Addr v,
static int apply_r_larch_got_pc(struct module *mod,
Elf_Shdr *sechdrs, u32 *location, Elf_Addr v,
- s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
+ long *rela_stack, size_t *rela_stack_top, unsigned int type)
{
- Elf_Addr got = module_emit_got_entry(mod, sechdrs, v);
+ reloc_rela_handler got_handler;
- if (!got)
- return -EINVAL;
+ if (type != R_LARCH_GOT_PCADD_LO12) {
+ v = module_emit_got_entry(mod, sechdrs, v);
+ if (!v)
+ return -EINVAL;
+ }
switch (type) {
case R_LARCH_GOT_PC_LO12:
type = R_LARCH_PCALA_LO12;
+ got_handler = apply_r_larch_pcala;
break;
case R_LARCH_GOT_PC_HI20:
type = R_LARCH_PCALA_HI20;
+ got_handler = apply_r_larch_pcala;
+ break;
+ case R_LARCH_GOT_PCADD_LO12:
+ type = R_LARCH_PCADD_LO12;
+ got_handler = apply_r_larch_pcadd;
+ break;
+ case R_LARCH_GOT_PCADD_HI20:
+ type = R_LARCH_PCADD_HI20;
+ got_handler = apply_r_larch_pcadd;
break;
default:
pr_err("%s: Unsupport relocation type %u\n", mod->name, type);
return -EINVAL;
}
- return apply_r_larch_pcala(mod, location, got, rela_stack, rela_stack_top, type);
+ return got_handler(mod, location, v, rela_stack, rela_stack_top, type);
}
static int apply_r_larch_32_pcrel(struct module *mod, u32 *location, Elf_Addr v,
- s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
+ long *rela_stack, size_t *rela_stack_top, unsigned int type)
{
ptrdiff_t offset = (void *)v - (void *)location;
@@ -377,31 +436,22 @@ static int apply_r_larch_32_pcrel(struct module *mod, u32 *location, Elf_Addr v,
return 0;
}
+#ifdef CONFIG_32BIT
+#define apply_r_larch_64_pcrel apply_r_larch_error
+#else
static int apply_r_larch_64_pcrel(struct module *mod, u32 *location, Elf_Addr v,
- s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
+ long *rela_stack, size_t *rela_stack_top, unsigned int type)
{
ptrdiff_t offset = (void *)v - (void *)location;
*(u64 *)location = offset;
return 0;
}
-
-/*
- * reloc_handlers_rela() - Apply a particular relocation to a module
- * @mod: the module to apply the reloc to
- * @location: the address at which the reloc is to be applied
- * @v: the value of the reloc, with addend for RELA-style
- * @rela_stack: the stack used for store relocation info, LOCAL to THIS module
- * @rela_stac_top: where the stack operation(pop/push) applies to
- *
- * Return: 0 upon success, else -ERRNO
- */
-typedef int (*reloc_rela_handler)(struct module *mod, u32 *location, Elf_Addr v,
- s64 *rela_stack, size_t *rela_stack_top, unsigned int type);
+#endif
/* The handlers for known reloc types */
static reloc_rela_handler reloc_rela_handlers[] = {
- [R_LARCH_NONE ... R_LARCH_64_PCREL] = apply_r_larch_error,
+ [R_LARCH_NONE ... R_LARCH_TLS_DESC_PCADD_LO12] = apply_r_larch_error,
[R_LARCH_NONE] = apply_r_larch_none,
[R_LARCH_32] = apply_r_larch_32,
@@ -414,7 +464,8 @@ static reloc_rela_handler reloc_rela_handlers[] = {
[R_LARCH_SOP_SUB ... R_LARCH_SOP_IF_ELSE] = apply_r_larch_sop,
[R_LARCH_SOP_POP_32_S_10_5 ... R_LARCH_SOP_POP_32_U] = apply_r_larch_sop_imm_field,
[R_LARCH_ADD32 ... R_LARCH_SUB64] = apply_r_larch_add_sub,
- [R_LARCH_PCALA_HI20...R_LARCH_PCALA64_HI12] = apply_r_larch_pcala,
+ [R_LARCH_PCADD_HI20 ... R_LARCH_PCADD_LO12] = apply_r_larch_pcadd,
+ [R_LARCH_PCALA_HI20 ... R_LARCH_PCALA64_HI12] = apply_r_larch_pcala,
[R_LARCH_32_PCREL] = apply_r_larch_32_pcrel,
[R_LARCH_64_PCREL] = apply_r_larch_64_pcrel,
};
@@ -423,9 +474,10 @@ int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
unsigned int symindex, unsigned int relsec,
struct module *mod)
{
- int i, err;
- unsigned int type;
- s64 rela_stack[RELA_STACK_DEPTH];
+ int err;
+ unsigned int i, idx, type;
+ unsigned int num_relocations;
+ long rela_stack[RELA_STACK_DEPTH];
size_t rela_stack_top = 0;
reloc_rela_handler handler;
void *location;
@@ -436,8 +488,10 @@ int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
pr_debug("%s: Applying relocate section %u to %u\n", __func__, relsec,
sechdrs[relsec].sh_info);
+ idx = 0;
rela_stack_top = 0;
- for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
+ num_relocations = sechdrs[relsec].sh_size / sizeof(*rel);
+ for (i = 0; i < num_relocations; i++) {
/* This is where to make the change */
location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr + rel[i].r_offset;
/* This is the symbol it is referring to */
@@ -462,17 +516,59 @@ int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
return -EINVAL;
}
- pr_debug("type %d st_value %llx r_addend %llx loc %llx\n",
+ pr_debug("type %d st_value %lx r_addend %lx loc %lx\n",
(int)ELF_R_TYPE(rel[i].r_info),
- sym->st_value, rel[i].r_addend, (u64)location);
+ (unsigned long)sym->st_value, (unsigned long)rel[i].r_addend, (unsigned long)location);
v = sym->st_value + rel[i].r_addend;
+
+ if (type == R_LARCH_PCADD_LO12 || type == R_LARCH_GOT_PCADD_LO12) {
+ bool found = false;
+ unsigned int j = idx;
+
+ do {
+ u32 hi20_type = ELF_R_TYPE(rel[j].r_info);
+ unsigned long hi20_location =
+ sechdrs[sechdrs[relsec].sh_info].sh_addr + rel[j].r_offset;
+
+ /* Find the corresponding HI20 relocation entry */
+ if ((hi20_location == sym->st_value) && (hi20_type == type - 1)) {
+ s32 hi20, lo12;
+ Elf_Sym *hi20_sym =
+ (Elf_Sym *)sechdrs[symindex].sh_addr + ELF_R_SYM(rel[j].r_info);
+ unsigned long hi20_sym_val = hi20_sym->st_value + rel[j].r_addend;
+
+ /* Calculate LO12 offset */
+ size_t offset = hi20_sym_val - hi20_location;
+ if (hi20_type == R_LARCH_GOT_PCADD_HI20) {
+ offset = module_emit_got_entry(mod, sechdrs, hi20_sym_val);
+ offset = offset - hi20_location;
+ }
+ hi20 = (offset + 0x800) & 0xfffff000;
+ v = lo12 = offset - hi20;
+ found = true;
+ break;
+ }
+
+ j = (j + 1) % num_relocations;
+
+ } while (idx != j);
+
+ if (!found) {
+ pr_err("%s: Can not find HI20 relocation information\n", mod->name);
+ return -EINVAL;
+ }
+
+ idx = j; /* Record the previous j-loop end index */
+ }
+
switch (type) {
case R_LARCH_B26:
err = apply_r_larch_b26(mod, sechdrs, location,
v, rela_stack, &rela_stack_top, type);
break;
case R_LARCH_GOT_PC_HI20...R_LARCH_GOT_PC_LO12:
+ case R_LARCH_GOT_PCADD_HI20...R_LARCH_GOT_PCADD_LO12:
err = apply_r_larch_got_pc(mod, sechdrs, location,
v, rela_stack, &rela_stack_top, type);
break;
generated by cgit (git 2.34.1) at 2025-12-13 23:24:47 +0000