riscv: switch to relative exception tables

Similar as other architectures such as arm64, x86 and so on, use
offsets relative to the exception table entry values rather than
absolute addresses for both the exception locationand the fixup.

However, RISCV label difference will actually produce two relocations,
a pair of R_RISCV_ADD32 and R_RISCV_SUB32. Take below simple code for
example:

$ cat test.S
.section .text
1:
        nop
.section __ex_table,"a"
        .balign 4
        .long (1b - .)
.previous

$ riscv64-linux-gnu-gcc -c test.S
$ riscv64-linux-gnu-readelf -r test.o
Relocation section '.rela__ex_table' at offset 0x100 contains 2 entries:
  Offset          Info           Type           Sym. Value    Sym. Name + Addend
000000000000  000600000023 R_RISCV_ADD32     0000000000000000 .L1^B1 + 0
000000000000  000500000027 R_RISCV_SUB32     0000000000000000 .L0  + 0

The modpost will complain the R_RISCV_SUB32 relocation, so we need to
patch modpost.c to skip this relocation for .rela__ex_table section.

After this patch, the __ex_table section size of defconfig vmlinux is
reduced from 7072 Bytes to 3536 Bytes.

Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

diff --git a/arch/riscv/include/asm/Kbuild b/arch/riscv/include/asm/Kbuild
index 445ccc9..57b86fd 100644 (file)
--- a/arch/riscv/include/asm/Kbuild
+++ b/arch/riscv/include/asm/Kbuild
@@ -1,6 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
 generic-y += early_ioremap.h
-generic-y += extable.h
 generic-y += flat.h
 generic-y += kvm_para.h
 generic-y += user.h

diff --git a/arch/riscv/include/asm/extable.h b/arch/riscv/include/asm/extable.h
new file mode 100644 (file)
index 0000000..8476039
--- /dev/null
+++ b/arch/riscv/include/asm/extable.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_RISCV_EXTABLE_H
+#define _ASM_RISCV_EXTABLE_H
+
+/*
+ * The exception table consists of pairs of relative offsets: the first
+ * is the relative offset to an instruction that is allowed to fault,
+ * and the second is the relative offset at which the program should
+ * continue. No registers are modified, so it is entirely up to the
+ * continuation code to figure out what to do.
+ *
+ * All the routines below use bits of fixup code that are out of line
+ * with the main instruction path.  This means when everything is well,
+ * we don't even have to jump over them.  Further, they do not intrude
+ * on our cache or tlb entries.
+ */
+
+struct exception_table_entry {
+       int insn, fixup;
+};
+
+#define ARCH_HAS_RELATIVE_EXTABLE
+
+int fixup_exception(struct pt_regs *regs);
+#endif

diff --git a/arch/riscv/include/asm/uaccess.h b/arch/riscv/include/asm/uaccess.h
index 714cd31..0f2c5b9 100644 (file)
--- a/arch/riscv/include/asm/uaccess.h
+++ b/arch/riscv/include/asm/uaccess.h
@@ -12,8 +12,8 @@
 
 #define _ASM_EXTABLE(from, to)                                         \
        "       .pushsection    __ex_table, \"a\"\n"                    \
-       "       .balign "       RISCV_SZPTR "    \n"                    \
-       "       " RISCV_PTR     "(" #from "), (" #to ")\n"              \
+       "       .balign         4\n"                                    \
+       "       .long           (" #from " - .), (" #to " - .)\n"       \
        "       .popsection\n"
 
 /*

diff --git a/arch/riscv/lib/uaccess.S b/arch/riscv/lib/uaccess.S
index 63bc691..55f80f8 100644 (file)
--- a/arch/riscv/lib/uaccess.S
+++ b/arch/riscv/lib/uaccess.S
@@ -7,8 +7,8 @@
 100:
        \op \reg, \addr
        .section __ex_table,"a"
-       .balign RISCV_SZPTR
-       RISCV_PTR 100b, \lbl
+       .balign 4
+       .long (100b - .), (\lbl - .)
        .previous
        .endm
 

diff --git a/arch/riscv/mm/extable.c b/arch/riscv/mm/extable.c
index ddb7d3b..d8d239c 100644 (file)
--- a/arch/riscv/mm/extable.c
+++ b/arch/riscv/mm/extable.c
@@ -28,6 +28,6 @@ int fixup_exception(struct pt_regs *regs)
                return rv_bpf_fixup_exception(fixup, regs);
 #endif
 
-       regs->epc = fixup->fixup;
+       regs->epc = (unsigned long)&fixup->fixup + fixup->fixup;
        return 1;
 }

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index cb8ab7d..6bfa332 100644 (file)
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -1830,6 +1830,14 @@ static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
        return 0;
 }
 
+#ifndef EM_RISCV
+#define EM_RISCV               243
+#endif
+
+#ifndef R_RISCV_SUB32
+#define R_RISCV_SUB32          39
+#endif
+
 static void section_rela(const char *modname, struct elf_info *elf,
                         Elf_Shdr *sechdr)
 {
@@ -1866,6 +1874,13 @@ static void section_rela(const char *modname, struct elf_info *elf,
                r_sym = ELF_R_SYM(r.r_info);
 #endif
                r.r_addend = TO_NATIVE(rela->r_addend);
+               switch (elf->hdr->e_machine) {
+               case EM_RISCV:
+                       if (!strcmp("__ex_table", fromsec) &&
+                           ELF_R_TYPE(r.r_info) == R_RISCV_SUB32)
+                               continue;
+                       break;
+               }
                sym = elf->symtab_start + r_sym;
                /* Skip special sections */
                if (is_shndx_special(sym->st_shndx))

diff --git a/scripts/sorttable.c b/scripts/sorttable.c
index ca9db62..f4a8255 100644 (file)
--- a/scripts/sorttable.c
+++ b/scripts/sorttable.c
@@ -346,6 +346,7 @@ static int do_file(char const *const fname, void *addr)
        case EM_PARISC:
        case EM_PPC:
        case EM_PPC64:
+       case EM_RISCV:
                custom_sort = sort_relative_table;
                break;
        case EM_ARCOMPACT:
@@ -353,7 +354,6 @@ static int do_file(char const *const fname, void *addr)
        case EM_ARM:
        case EM_MICROBLAZE:
        case EM_MIPS:
-       case EM_RISCV:
        case EM_XTENSA:
                break;
        default: