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parisc architecture fixes for kernel v6.7-rc3:

Browse Source 
- Drop HP-UX ENOSYM and EREMOTERELEASE return codes to avoid glibc
   build issues
 - Fix section alignments for ex_table, altinstructions, parisc unwind
   table, jump_table and bug_table
 - Reduce size of bug_table on 64-bit kernel by using relative
   pointers
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Merge tag 'parisc-for-6.7-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux

Pull parisc architecture fixes from Helge Deller:
 "This patchset fixes and enforces correct section alignments for the
  ex_table, altinstructions, parisc_unwind, jump_table and bug_table
  which are created by inline assembly.

  Due to not being correctly aligned at link & load time they can
  trigger unnecessarily the kernel unaligned exception handler at
  runtime. While at it, I switched the bug table to use relative
  addresses which reduces the size of the table by half on 64-bit.

  We still had the ENOSYM and EREMOTERELEASE errno symbols as left-overs
  from HP-UX, which now trigger build-issues with glibc. We can simply
  remove them.

  Most of the patches are tagged for stable kernel series.

  Summary:

   - Drop HP-UX ENOSYM and EREMOTERELEASE return codes to avoid glibc
     build issues

   - Fix section alignments for ex_table, altinstructions, parisc unwind
     table, jump_table and bug_table

   - Reduce size of bug_table on 64-bit kernel by using relative
     pointers"

* tag 'parisc-for-6.7-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
  parisc: Reduce size of the bug_table on 64-bit kernel by half
  parisc: Drop the HP-UX ENOSYM and EREMOTERELEASE error codes
  parisc: Use natural CPU alignment for bug_table
  parisc: Ensure 32-bit alignment on parisc unwind section
  parisc: Mark lock_aligned variables 16-byte aligned on SMP
  parisc: Mark jump_table naturally aligned
  parisc: Mark altinstructions read-only and 32-bit aligned
  parisc: Mark ex_table entries 32-bit aligned in uaccess.h
  parisc: Mark ex_table entries 32-bit aligned in assembly.h
This commit is contained in:
Linus Torvalds 2023-11-26 09:59:39 -08:00
commit d2da77f431
11 changed files with 43 additions and 34 deletions
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7
arch/parisc/Kconfig
View File

@ -115,9 +115,12 @@ config ARCH_HAS_ILOG2_U64
default n
config GENERIC_BUG
bool
default y
def_bool y
depends on BUG
select GENERIC_BUG_RELATIVE_POINTERS if 64BIT
config GENERIC_BUG_RELATIVE_POINTERS
bool
config GENERIC_HWEIGHT
bool

9
arch/parisc/include/asm/alternative.h
View File

@ -34,7 +34,8 @@ void apply_alternatives(struct alt_instr *start, struct alt_instr *end,
/* Alternative SMP implementation. */
#define ALTERNATIVE(cond, replacement) "!0:" \
".section .altinstructions, \"aw\" !" \
".section .altinstructions, \"a\" !" \
".align 4 !" \
".word (0b-4-.) !" \
".hword 1, " __stringify(cond) " !" \
".word " __stringify(replacement) " !" \
@ -44,7 +45,8 @@ void apply_alternatives(struct alt_instr *start, struct alt_instr *end,
/* to replace one single instructions by a new instruction */
#define ALTERNATIVE(from, to, cond, replacement)\
.section .altinstructions, "aw" ! \
.section .altinstructions, "a" ! \
.align 4 ! \
.word (from - .) ! \
.hword (to - from)/4, cond ! \
.word replacement ! \
@ -52,7 +54,8 @@ void apply_alternatives(struct alt_instr *start, struct alt_instr *end,
/* to replace multiple instructions by new code */
#define ALTERNATIVE_CODE(from, num_instructions, cond, new_instr_ptr)\
.section .altinstructions, "aw" ! \
.section .altinstructions, "a" ! \
.align 4 ! \
.word (from - .) ! \
.hword -num_instructions, cond ! \
.word (new_instr_ptr - .) ! \

1
arch/parisc/include/asm/assembly.h
View File

@ -574,6 +574,7 @@
*/
#define ASM_EXCEPTIONTABLE_ENTRY(fault_addr, except_addr) \
.section __ex_table,"aw" ! \
.align 4 ! \
.word (fault_addr - .), (except_addr - .) ! \
.previous

38
arch/parisc/include/asm/bug.h
View File

@ -17,24 +17,27 @@
#define PARISC_BUG_BREAK_ASM "break 0x1f, 0x1fff"
#define PARISC_BUG_BREAK_INSN 0x03ffe01f /* PARISC_BUG_BREAK_ASM */
#if defined(CONFIG_64BIT)
#define ASM_WORD_INSN ".dword\t"
#ifdef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
# define __BUG_REL(val) ".word " __stringify(val) " - ."
#else
#define ASM_WORD_INSN ".word\t"
# define __BUG_REL(val) ".word " __stringify(val)
#endif
#ifdef CONFIG_DEBUG_BUGVERBOSE
#define BUG() \
do { \
asm volatile("\n" \
"1:\t" PARISC_BUG_BREAK_ASM "\n" \
"\t.pushsection __bug_table,\"aw\"\n" \
"2:\t" ASM_WORD_INSN "1b, %c0\n" \
"\t.short %c1, %c2\n" \
"\t.org 2b+%c3\n" \
"\t.pushsection __bug_table,\"a\"\n" \
"\t.align 4\n" \
"2:\t" __BUG_REL(1b) "\n" \
"\t" __BUG_REL(%c0) "\n" \
"\t.short %1, %2\n" \
"\t.blockz %3-2*4-2*2\n" \
"\t.popsection" \
: : "i" (__FILE__), "i" (__LINE__), \
"i" (0), "i" (sizeof(struct bug_entry)) ); \
"i" (0), "i" (sizeof(struct bug_entry)) ); \
unreachable(); \
} while(0)
@ -51,10 +54,12 @@
do { \
asm volatile("\n" \
"1:\t" PARISC_BUG_BREAK_ASM "\n" \
"\t.pushsection __bug_table,\"aw\"\n" \
"2:\t" ASM_WORD_INSN "1b, %c0\n" \
"\t.short %c1, %c2\n" \
"\t.org 2b+%c3\n" \
"\t.pushsection __bug_table,\"a\"\n" \
"\t.align 4\n" \
"2:\t" __BUG_REL(1b) "\n" \
"\t" __BUG_REL(%c0) "\n" \
"\t.short %1, %2\n" \
"\t.blockz %3-2*4-2*2\n" \
"\t.popsection" \
: : "i" (__FILE__), "i" (__LINE__), \
"i" (BUGFLAG_WARNING|(flags)), \
@ -65,10 +70,11 @@
do { \
asm volatile("\n" \
"1:\t" PARISC_BUG_BREAK_ASM "\n" \
"\t.pushsection __bug_table,\"aw\"\n" \
"2:\t" ASM_WORD_INSN "1b\n" \
"\t.short %c0\n" \
"\t.org 2b+%c1\n" \
"\t.pushsection __bug_table,\"a\"\n" \
"\t.align %2\n" \
"2:\t" __BUG_REL(1b) "\n" \
"\t.short %0\n" \
"\t.blockz %1-4-2\n" \
"\t.popsection" \
: : "i" (BUGFLAG_WARNING|(flags)), \
"i" (sizeof(struct bug_entry)) ); \

8
arch/parisc/include/asm/jump_label.h
View File

@ -15,10 +15,12 @@ static __always_inline bool arch_static_branch(struct static_key *key, bool bran
asm_volatile_goto("1:\n\t"
"nop\n\t"
".pushsection __jump_table, \"aw\"\n\t"
".align %1\n\t"
".word 1b - ., %l[l_yes] - .\n\t"
__stringify(ASM_ULONG_INSN) " %c0 - .\n\t"
".popsection\n\t"
: : "i" (&((char *)key)[branch]) : : l_yes);
: : "i" (&((char *)key)[branch]), "i" (sizeof(long))
: : l_yes);
return false;
l_yes:
@ -30,10 +32,12 @@ static __always_inline bool arch_static_branch_jump(struct static_key *key, bool
asm_volatile_goto("1:\n\t"
"b,n %l[l_yes]\n\t"
".pushsection __jump_table, \"aw\"\n\t"
".align %1\n\t"
".word 1b - ., %l[l_yes] - .\n\t"
__stringify(ASM_ULONG_INSN) " %c0 - .\n\t"
".popsection\n\t"
: : "i" (&((char *)key)[branch]) : : l_yes);
: : "i" (&((char *)key)[branch]), "i" (sizeof(long))
: : l_yes);
return false;
l_yes:

2
arch/parisc/include/asm/ldcw.h
View File

@ -55,7 +55,7 @@
})
#ifdef CONFIG_SMP
# define __lock_aligned __section(".data..lock_aligned")
# define __lock_aligned __section(".data..lock_aligned") __aligned(16)
#endif
#endif /* __PARISC_LDCW_H */

1
arch/parisc/include/asm/uaccess.h
View File

@ -41,6 +41,7 @@ struct exception_table_entry {
#define ASM_EXCEPTIONTABLE_ENTRY( fault_addr, except_addr )\
".section __ex_table,\"aw\"\n" \
".align 4\n" \
".word (" #fault_addr " - .), (" #except_addr " - .)\n\t" \
".previous\n"

2
arch/parisc/include/uapi/asm/errno.h
View File

@ -75,7 +75,6 @@
/* We now return you to your regularly scheduled HPUX. */
#define ENOSYM 215 /* symbol does not exist in executable */
#define ENOTSOCK 216 /* Socket operation on non-socket */
#define EDESTADDRREQ 217 /* Destination address required */
#define EMSGSIZE 218 /* Message too long */
@ -101,7 +100,6 @@
#define ETIMEDOUT 238 /* Connection timed out */
#define ECONNREFUSED 239 /* Connection refused */
#define EREFUSED ECONNREFUSED /* for HP's NFS apparently */
#define EREMOTERELEASE 240 /* Remote peer released connection */
#define EHOSTDOWN 241 /* Host is down */
#define EHOSTUNREACH 242 /* No route to host */

1
arch/parisc/kernel/vmlinux.lds.S
View File

@ -130,6 +130,7 @@ SECTIONS
RO_DATA(8)
/* unwind info */
. = ALIGN(4);
.PARISC.unwind : {
__start___unwind = .;
*(.PARISC.unwind)

6
lib/errname.c
View File

@ -111,9 +111,6 @@ static const char *names_0[] = {
E(ENOSPC),
E(ENOSR),
E(ENOSTR),
#ifdef ENOSYM
E(ENOSYM),
#endif
E(ENOSYS),
E(ENOTBLK),
E(ENOTCONN),
@ -144,9 +141,6 @@ static const char *names_0[] = {
#endif
E(EREMOTE),
E(EREMOTEIO),
#ifdef EREMOTERELEASE
E(EREMOTERELEASE),
#endif
E(ERESTART),
E(ERFKILL),
E(EROFS),

2
tools/arch/parisc/include/uapi/asm/errno.h
View File

@ -75,7 +75,6 @@
/* We now return you to your regularly scheduled HPUX. */
#define ENOSYM 215 /* symbol does not exist in executable */
#define ENOTSOCK 216 /* Socket operation on non-socket */
#define EDESTADDRREQ 217 /* Destination address required */
#define EMSGSIZE 218 /* Message too long */
@ -101,7 +100,6 @@
#define ETIMEDOUT 238 /* Connection timed out */
#define ECONNREFUSED 239 /* Connection refused */
#define EREFUSED ECONNREFUSED /* for HP's NFS apparently */
#define EREMOTERELEASE 240 /* Remote peer released connection */
#define EHOSTDOWN 241 /* Host is down */
#define EHOSTUNREACH 242 /* No route to host */