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RISC-V: Support MODULE_SECTIONS mechanism on RV32

Browse source 
This patch supports dynamic generate got and plt sections mechanism on
rv32. It contains the modification as follows:
 - Always enable MODULE_SECTIONS (both rv64 and rv32)
 - Change the fixed size type.

This patch had been tested by following modules:

btrfs 6795991 0 - Live 0xa544b000
test_static_keys 17304 0 - Live 0xa28be000
zstd_compress 1198986 1 btrfs, Live 0xa2a25000
zstd_decompress 608112 1 btrfs, Live 0xa24e7000
lzo 8787 0 - Live 0xa2049000
xor 27461 1 btrfs, Live 0xa2041000
zram 78849 0 - Live 0xa2276000
netdevsim 55909 0 - Live 0xa202d000
tun 211534 0 - Live 0xa21b5000
fuse 566049 0 - Live 0xa25fb000
nfs_layout_flexfiles 192597 0 - Live 0xa229b000
ramoops 74895 0 - Live 0xa2019000
xfs 3973221 0 - Live 0xa507f000
libcrc32c 3053 2 btrfs,xfs, Live 0xa34af000
lzo_compress 17302 2 btrfs,lzo, Live 0xa347d000
lzo_decompress 7178 2 btrfs,lzo, Live 0xa3451000
raid6_pq 142086 1 btrfs, Live 0xa33a4000
reed_solomon 31022 1 ramoops, Live 0xa31eb000
test_bitmap 3734 0 - Live 0xa31af000
test_bpf 1588736 0 - Live 0xa2c11000
test_kmod 41161 0 - Live 0xa29f8000
test_module 1356 0 - Live 0xa299e000
test_printf 6024 0 [permanent], Live 0xa2971000
test_static_key_base 5797 1 test_static_keys, Live 0xa2931000
test_user_copy 4382 0 - Live 0xa28c9000
xxhash 70501 2 zstd_compress,zstd_decompress, Live 0xa2055000

Signed-off-by: Zong Li <zong@andestech.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Zong Li 2018-12-07 17:02:16 +08:00 • committed by Palmer Dabbelt
parent 3b56adcf94
commit 2cffc95690
No known key found for this signature in database
GPG key ID: EF4CA1502CCBAB41
3 changed files with 32 additions and 28 deletions
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2
arch/riscv/Kconfig
View file

@ -40,6 +40,7 @@ config RISCV
select HAVE_ARCH_TRACEHOOK
select HAVE_PCI
select MODULES_USE_ELF_RELA if MODULES
select MODULE_SECTIONS if MODULES
select THREAD_INFO_IN_TASK
select PCI_DOMAINS_GENERIC if PCI
select PCI_MSI if PCI
@ -152,7 +153,6 @@ choice
bool "2GiB"
config MAXPHYSMEM_128GB
depends on 64BIT && CMODEL_MEDANY
select MODULE_SECTIONS if MODULES
bool "128GiB"
endchoice

28
arch/riscv/include/asm/module.h
View file

@ -9,12 +9,12 @@
#define MODULE_ARCH_VERMAGIC "riscv"
struct module;
u64 module_emit_got_entry(struct module *mod, u64 val);
u64 module_emit_plt_entry(struct module *mod, u64 val);
unsigned long module_emit_got_entry(struct module *mod, unsigned long val);
unsigned long module_emit_plt_entry(struct module *mod, unsigned long val);
#ifdef CONFIG_MODULE_SECTIONS
struct mod_section {
struct elf64_shdr *shdr;
Elf_Shdr *shdr;
int num_entries;
int max_entries;
};
@ -26,18 +26,18 @@ struct mod_arch_specific {
};
struct got_entry {
u64 symbol_addr; /* the real variable address */
unsigned long symbol_addr; /* the real variable address */
};
static inline struct got_entry emit_got_entry(u64 val)
static inline struct got_entry emit_got_entry(unsigned long val)
{
return (struct got_entry) {val};
}
static inline struct got_entry *get_got_entry(u64 val,
static inline struct got_entry *get_got_entry(unsigned long val,
const struct mod_section *sec)
{
struct got_entry *got = (struct got_entry *)sec->shdr->sh_addr;
struct got_entry *got = (struct got_entry *)(sec->shdr->sh_addr);
int i;
for (i = 0; i < sec->num_entries; i++) {
if (got[i].symbol_addr == val)
@ -62,7 +62,9 @@ struct plt_entry {
#define REG_T0 0x5
#define REG_T1 0x6
static inline struct plt_entry emit_plt_entry(u64 val, u64 plt, u64 got_plt)
static inline struct plt_entry emit_plt_entry(unsigned long val,
unsigned long plt,
unsigned long got_plt)
{
/*
* U-Type encoding:
@ -76,7 +78,7 @@ static inline struct plt_entry emit_plt_entry(u64 val, u64 plt, u64 got_plt)
* +------------+------------+--------+----------+----------+
*
*/
u64 offset = got_plt - plt;
unsigned long offset = got_plt - plt;
u32 hi20 = (offset + 0x800) & 0xfffff000;
u32 lo12 = (offset - hi20);
return (struct plt_entry) {
@ -86,7 +88,7 @@ static inline struct plt_entry emit_plt_entry(u64 val, u64 plt, u64 got_plt)
};
}
static inline int get_got_plt_idx(u64 val, const struct mod_section *sec)
static inline int get_got_plt_idx(unsigned long val, const struct mod_section *sec)
{
struct got_entry *got_plt = (struct got_entry *)sec->shdr->sh_addr;
int i;
@ -97,9 +99,9 @@ static inline int get_got_plt_idx(u64 val, const struct mod_section *sec)
return -1;
}
static inline struct plt_entry *get_plt_entry(u64 val,
const struct mod_section *sec_plt,
const struct mod_section *sec_got_plt)
static inline struct plt_entry *get_plt_entry(unsigned long val,
const struct mod_section *sec_plt,
const struct mod_section *sec_got_plt)
{
struct plt_entry *plt = (struct plt_entry *)sec_plt->shdr->sh_addr;
int got_plt_idx = get_got_plt_idx(val, sec_got_plt);

30
arch/riscv/kernel/module-sections.c
View file

@ -9,14 +9,14 @@
#include <linux/kernel.h>
#include <linux/module.h>
u64 module_emit_got_entry(struct module *mod, u64 val)
unsigned long module_emit_got_entry(struct module *mod, unsigned long val)
{
struct mod_section *got_sec = &mod->arch.got;
int i = got_sec->num_entries;
struct got_entry *got = get_got_entry(val, got_sec);
if (got)
return (u64)got;
return (unsigned long)got;
/* There is no duplicate entry, create a new one */
got = (struct got_entry *)got_sec->shdr->sh_addr;
@ -25,10 +25,10 @@ u64 module_emit_got_entry(struct module *mod, u64 val)
got_sec->num_entries++;
BUG_ON(got_sec->num_entries > got_sec->max_entries);
return (u64)&got[i];
return (unsigned long)&got[i];
}
u64 module_emit_plt_entry(struct module *mod, u64 val)
unsigned long module_emit_plt_entry(struct module *mod, unsigned long val)
{
struct mod_section *got_plt_sec = &mod->arch.got_plt;
struct got_entry *got_plt;
@ -37,27 +37,29 @@ u64 module_emit_plt_entry(struct module *mod, u64 val)
int i = plt_sec->num_entries;
if (plt)
return (u64)plt;
return (unsigned long)plt;
/* There is no duplicate entry, create a new one */
got_plt = (struct got_entry *)got_plt_sec->shdr->sh_addr;
got_plt[i] = emit_got_entry(val);
plt = (struct plt_entry *)plt_sec->shdr->sh_addr;
plt[i] = emit_plt_entry(val, (u64)&plt[i], (u64)&got_plt[i]);
plt[i] = emit_plt_entry(val,
(unsigned long)&plt[i],
(unsigned long)&got_plt[i]);
plt_sec->num_entries++;
got_plt_sec->num_entries++;
BUG_ON(plt_sec->num_entries > plt_sec->max_entries);
return (u64)&plt[i];
return (unsigned long)&plt[i];
}
static int is_rela_equal(const Elf64_Rela *x, const Elf64_Rela *y)
static int is_rela_equal(const Elf_Rela *x, const Elf_Rela *y)
{
return x->r_info == y->r_info && x->r_addend == y->r_addend;
}
static bool duplicate_rela(const Elf64_Rela *rela, int idx)
static bool duplicate_rela(const Elf_Rela *rela, int idx)
{
int i;
for (i = 0; i < idx; i++) {
@ -67,13 +69,13 @@ static bool duplicate_rela(const Elf64_Rela *rela, int idx)
return false;
}
static void count_max_entries(Elf64_Rela *relas, int num,
static void count_max_entries(Elf_Rela *relas, int num,
unsigned int *plts, unsigned int *gots)
{
unsigned int type, i;
for (i = 0; i < num; i++) {
type = ELF64_R_TYPE(relas[i].r_info);
type = ELF_RISCV_R_TYPE(relas[i].r_info);
if (type == R_RISCV_CALL_PLT) {
if (!duplicate_rela(relas, i))
(*plts)++;
@ -118,9 +120,9 @@ int module_frob_arch_sections(Elf_Ehdr *ehdr, Elf_Shdr *sechdrs,
/* Calculate the maxinum number of entries */
for (i = 0; i < ehdr->e_shnum; i++) {
Elf64_Rela *relas = (void *)ehdr + sechdrs[i].sh_offset;
int num_rela = sechdrs[i].sh_size / sizeof(Elf64_Rela);
Elf64_Shdr *dst_sec = sechdrs + sechdrs[i].sh_info;
Elf_Rela *relas = (void *)ehdr + sechdrs[i].sh_offset;
int num_rela = sechdrs[i].sh_size / sizeof(Elf_Rela);
Elf_Shdr *dst_sec = sechdrs + sechdrs[i].sh_info;
if (sechdrs[i].sh_type != SHT_RELA)
continue;