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ARM: Rewrite sysdeps/arm/tls-macros.h

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Roland McGrath 2015-03-13 10:10:09 -07:00
parent cf9313e7d1
commit cdaf79d0af
2 changed files with 74 additions and 72 deletions
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@ -1,3 +1,11 @@
2015-03-13 Roland McGrath <roland@hack.frob.com>
* sysdeps/arm/tls-macros.h: Include <sysdep.h>.
(GET_SPECIAL_RELOC, GET_SPECIAL_PCREL): New macros to encapsulate
all the necessary asm magic in one place.
(TLS_LE, TLS_IE, TLS_LD, TLS_GD): Rewritten as C expressions
using those.
2015-03-13 Carlos O'Donell <carlos@redhat.com>
[BZ #14906]

124
sysdeps/arm/tls-macros.h
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@ -1,78 +1,72 @@
#include <sysdep.h> /* For ARCH_HAS_T2. */
#ifdef __thumb2__
# define ARM_PC_OFFSET "4"
#else
# define ARM_PC_OFFSET "8"
#endif
#define TLS_LE(x) \
({ int *__result; \
void *tp = __builtin_thread_pointer (); \
asm ("ldr %0, 1f; " \
"add %0, %1, %0; " \
"b 2f; " \
".align 2; " \
"1: .word " #x "(tpoff); " \
"2: " \
: "=&r" (__result) : "r" (tp)); \
__result; })
#ifdef __thumb2__
#define TLS_IE(x) \
({ int *__result; \
void *tp = __builtin_thread_pointer (); \
asm ("ldr %0, 1f; " \
"3: add %0, pc, %0;" \
"ldr %0, [%0];" \
"add %0, %1, %0; " \
"b 2f; " \
".align 2; " \
"1: .word " #x "(gottpoff) + (. - 3b - 4); " \
"2: " \
: "=&r" (__result) : "r" (tp)); \
__result; })
/* Returns the address of data containing ".word SYMBOL(RELOC)". */
#if defined (ARCH_HAS_T2) && !defined (PIC)
# define GET_SPECIAL_RELOC(symbol, reloc) \
({ \
int *__##symbol##_rodata; \
asm ("movw %0, #:lower16:1f\n" \
"movt %0, #:upper16:1f\n" \
".pushsection .rodata.cst4, \"aM\", %%progbits, 4\n" \
".balign 4\n" \
"1: .word " #symbol "(" #reloc ")\n" \
".popsection" \
: "=r" (__##symbol##_rodata)); \
__##symbol##_rodata; \
})
#elif defined (ARCH_HAS_T2) && defined (PIC) && ARM_PCREL_MOVW_OK
# define GET_SPECIAL_RELOC(symbol, reloc) \
({ \
int *__##symbol##_rodata; \
asm ("movw %0, #:lower16:1f - 2f - " ARM_PC_OFFSET "\n" \
"movt %0, #:upper16:1f - 2f - " ARM_PC_OFFSET "\n" \
".pushsection .rodata.cst4, \"aM\", %%progbits, 4\n" \
".balign 4\n" \
"1: .word " #symbol "(" #reloc ")\n" \
".popsection\n" \
"2: add %0, %0, pc" \
: "=r" (__##symbol##_rodata)); \
__##symbol##_rodata; \
})
#else
#define TLS_IE(x) \
({ int *__result; \
void *tp = __builtin_thread_pointer (); \
asm ("ldr %0, 1f; " \
"3: ldr %0, [pc, %0];" \
"add %0, %1, %0; " \
"b 2f; " \
".align 2; " \
"1: .word " #x "(gottpoff) + (. - 3b - 8); " \
# define GET_SPECIAL_RELOC(symbol, reloc) \
({ \
int *__##symbol##_rodata; \
asm ("adr %0, 1f\n" \
"b 2f\n" \
".balign 4\n" \
"1: .word " #symbol "(" #reloc ")\n" \
"2:" \
: "=&r" (__result) : "r" (tp)); \
__result; })
: "=r" (__##symbol##_rodata)); \
__##symbol##_rodata; \
})
#endif
/* Returns the pointer value (SYMBOL(RELOC) + pc - PC_OFS). */
#define GET_SPECIAL_PCREL(symbol, reloc) \
({ \
int *__##symbol##_rodata = GET_SPECIAL_RELOC (symbol, reloc); \
(void *) ((int) __##symbol##_rodata + *__##symbol##_rodata); \
})
#define TLS_LE(x) \
(__builtin_thread_pointer () + *GET_SPECIAL_RELOC (x, tpoff))
#define TLS_IE(x) \
((int *) (__builtin_thread_pointer () \
+ *(int *) GET_SPECIAL_PCREL (x, gottpoff)))
extern void *__tls_get_addr (void *);
#define TLS_LD(x) \
({ char *__result; \
int __offset; \
extern void *__tls_get_addr (void *); \
asm ("ldr %0, 2f; " \
"1: add %0, pc, %0; " \
"b 3f; " \
".align 2; " \
"2: .word " #x "(tlsldm) + (. - 1b - "ARM_PC_OFFSET"); " \
"3: " \
: "=r" (__result)); \
__result = (char *)__tls_get_addr (__result); \
asm ("ldr %0, 1f; " \
"b 2f; " \
".align 2; " \
"1: .word " #x "(tlsldo); " \
"2: " \
: "=r" (__offset)); \
(int *) (__result + __offset); })
((int *) (__tls_get_addr (GET_SPECIAL_PCREL (x, tlsldm)) \
+ *GET_SPECIAL_RELOC (x, tlsldo)))
#define TLS_GD(x) \
({ int *__result; \
extern void *__tls_get_addr (void *); \
asm ("ldr %0, 2f; " \
"1: add %0, pc, %0; " \
"b 3f; " \
".align 2; " \
"2: .word " #x "(tlsgd) + (. - 1b - "ARM_PC_OFFSET"); " \
"3: " \
: "=r" (__result)); \
(int *)__tls_get_addr (__result); })
((int *) __tls_get_addr (GET_SPECIAL_PCREL (x, tlsgd)))