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LoongArch: Add pointer mangling support.

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This commit is contained in:
caiyinyu 2022-08-10 10:21:46 +08:00
parent 12182ba18d
commit 1c9bc1b6e5
3 changed files with 74 additions and 3 deletions
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7
sysdeps/loongarch/__longjmp.S
View File

@ -20,8 +20,15 @@
#include <sys/asm.h>
ENTRY (__longjmp)
#ifdef PTR_MANGLE
REG_L t0, a0, 0*SZREG
PTR_DEMANGLE (ra, t0, t1, t2)
REG_L t0, a0, 1*SZREG
PTR_DEMANGLE2 (sp, t0, t1)
#else
REG_L ra, a0, 0*SZREG
REG_L sp, a0, 1*SZREG
#endif
REG_L x, a0, 2*SZREG
REG_L fp, a0, 3*SZREG
REG_L s0, a0, 4*SZREG

7
sysdeps/loongarch/setjmp.S
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@ -29,8 +29,15 @@ ENTRY (setjmp)
END (setjmp)
ENTRY (__sigsetjmp)
#ifdef PTR_MANGLE
PTR_MANGLE (t0, ra, t1, t2)
REG_S t0, a0, 0*SZREG
PTR_MANGLE2 (t0, sp, t1)
REG_S t0, a0, 1*SZREG
#else
REG_S ra, a0, 0*SZREG
REG_S sp, a0, 1*SZREG
#endif
REG_S x, a0, 2*SZREG
REG_S fp, a0, 3*SZREG
REG_S s0, a0, 4*SZREG

63
sysdeps/unix/sysv/linux/loongarch/sysdep.h
View File

@ -314,8 +314,65 @@ extern long int __syscall_error (long int neg_errno);
#endif /* ! __ASSEMBLER__ */
/* Pointer mangling is not supported. */
#define PTR_MANGLE(var) (void) (var)
#define PTR_DEMANGLE(var) (void) (var)
/* Pointer mangling is supported for LoongArch. */
/* Load or store to/from a got-relative EXPR into/from G, using T.
Note G and T are register names. */
#define LDST_GLOBAL(OP, G, T, EXPR) \
pcalau12i T, %got_pc_hi20(EXPR); \
OP T, T, %got_pc_lo12(EXPR); \
OP G, T, 0;
/* Load or store to/from a pc-relative EXPR into/from G, using T.
Note G and T are register names. */
#define LDST_PCREL(OP, G, T, EXPR) \
pcalau12i T, %pc_hi20(EXPR); \
OP G, T, %pc_lo12(EXPR);
#if (IS_IN (rtld) \
|| (!defined SHARED && (IS_IN (libc) \
|| IS_IN (libpthread))))
#ifdef __ASSEMBLER__
#define PTR_MANGLE(dst, src, guard, tmp) \
LDST_PCREL (REG_L, guard, tmp, __pointer_chk_guard_local); \
PTR_MANGLE2 (dst, src, guard);
#define PTR_DEMANGLE(dst, src, guard, tmp) \
LDST_PCREL (REG_L, guard, tmp, __pointer_chk_guard_local); \
PTR_DEMANGLE2 (dst, src, guard);
/* Use PTR_MANGLE2 for efficiency if guard is already loaded. */
#define PTR_MANGLE2(dst, src, guard) \
xor dst, src, guard;
#define PTR_DEMANGLE2(dst, src, guard) \
PTR_MANGLE2 (dst, src, guard);
#else
extern uintptr_t __pointer_chk_guard_local attribute_relro attribute_hidden;
#define PTR_MANGLE(var) \
(var) = (__typeof (var)) ((uintptr_t) (var) ^ __pointer_chk_guard_local)
#define PTR_DEMANGLE(var) PTR_MANGLE (var)
#endif
#else
#ifdef __ASSEMBLER__
#define PTR_MANGLE(dst, src, guard, tmp) \
LDST_GLOBAL (REG_L, guard, tmp, __pointer_chk_guard); \
PTR_MANGLE2 (dst, src, guard);
#define PTR_DEMANGLE(dst, src, guard, tmp) \
LDST_GLOBAL (REG_L, guard, tmp, __pointer_chk_guard); \
PTR_DEMANGLE2 (dst, src, guard);
/* Use PTR_MANGLE2 for efficiency if guard is already loaded. */
#define PTR_MANGLE2(dst, src, guard) \
xor dst, src, guard;
#define PTR_DEMANGLE2(dst, src, guard) \
PTR_MANGLE2 (dst, src, guard);
#else
extern uintptr_t __pointer_chk_guard attribute_relro;
#define PTR_MANGLE(var) \
(var) = (__typeof (var)) ((uintptr_t) (var) ^ __pointer_chk_guard)
#define PTR_DEMANGLE(var) PTR_MANGLE (var)
#endif
#endif
#endif /* linux/loongarch/sysdep.h */