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arm: Implement hard-tp for GET_TLS

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This commit is contained in:
Richard Henderson 2013-02-28 21:37:02 -08:00
parent 3377126b0a
commit 79fd873111
4 changed files with 30 additions and 11 deletions
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6
ports/ChangeLog.arm
View File

@ -1,5 +1,11 @@
2013-03-06 Richard Henderson <rth@redhat.com>
* sysdeps/arm/sysdep.h (ARCH_HAS_HARD_TP): New macro.
(GET_TLS): Use hard-tp if ARCH_HAS_HARD_TP.
* sysdeps/unix/sysv/linux/arm/aeabi_read_tp.S: Likewise.
* sysdeps/unix/sysv/linux/arm/sysdep.h (GET_TLS): Don't override
the default definition if ARCH_HAS_HARD_TP.
* sysdeps/arm/sysdep.h (__ARM_ARCH): New macro.
(ARCH_HAS_BX, ARCH_HAS_BLX, ARCH_HAS_T2): New macros.
(BX): Select on ARCH_HAS_BX instead of __USE_BX__.

14
ports/sysdeps/arm/sysdep.h
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@ -50,6 +50,9 @@
#if __ARM_ARCH > 4
# define ARCH_HAS_BLX
#endif
#if __ARM_ARCH > 6 || defined (__ARM_ARCH_6K__) || defined (__ARM_ARCH_6ZK__)
# define ARCH_HAS_HARD_TP
#endif
#if __ARM_ARCH > 6 || defined (__ARM_ARCH_6T2__)
# define ARCH_HAS_T2
#endif
@ -187,10 +190,14 @@
/* Helper to get the TLS base pointer. The interface is that TMP is a
register that may be used to hold the LR, if necessary. TMP may be
LR itself to indicate that LR need not be saved. The base pointer
is returned in R0. Only R0 and TMP are modified.
is returned in R0. Only R0 and TMP are modified. */
At this generic level we have no tricks to pull. Call the ABI routine. */
# define GET_TLS(TMP) \
# ifdef ARCH_HAS_HARD_TP
/* If the cpu has cp15 available, use it. */
# define GET_TLS(TMP) mrc p15, 0, r0, c13, c0, 3
# else
/* At this generic level we have no tricks to pull. Call the ABI routine. */
# define GET_TLS(TMP) \
push { r1, r2, r3, lr }; \
cfi_remember_state; \
cfi_adjust_cfa_offset (16); \
@ -201,6 +208,7 @@
bl __aeabi_read_tp; \
pop { r1, r2, r3, lr }; \
cfi_restore_state
# endif /* ARCH_HAS_HARD_TP */
#endif /* __ASSEMBLER__ */

5
ports/sysdeps/unix/sysv/linux/arm/aeabi_read_tp.S
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@ -41,7 +41,10 @@
.hidden __aeabi_read_tp
ENTRY (__aeabi_read_tp)
#ifdef __thumb2__
#ifdef ARCH_HAS_HARD_TP
mrc p15, 0, r0, c13, c0, 3
bx lr
#elif defined(__thumb2__)
movw r0, #0x0fe0
movt r0, #0xffff
bx r0

16
ports/sysdeps/unix/sysv/linux/arm/sysdep.h
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@ -45,26 +45,27 @@
#ifdef __ASSEMBLER__
#ifndef ARCH_HAS_HARD_TP
/* Internal macro calling the linux kernel kuser_get_tls helper.
Note that in thumb mode, a constant pool break is often out of range, so
we always expand the constant inline. */
#ifdef __thumb2__
# define GET_TLS_BODY \
# ifdef __thumb2__
# define GET_TLS_BODY \
movw r0, #0x0fe0; \
movt r0, #0xffff; \
blx r0
#else
# define GET_TLS_BODY \
# else
# define GET_TLS_BODY \
mov r0, #0xffff0fff; /* Point to the high page. */ \
mov lr, pc; /* Save our return address. */ \
sub pc, r0, #31 /* Jump to the TLS entry. */
#endif
# endif
/* Helper to get the TLS base pointer. Save LR in TMP, return in R0,
and no other registers clobbered. TMP may be LR itself to indicate
that no save is necessary. */
#undef GET_TLS
#define GET_TLS(TMP) \
# undef GET_TLS
# define GET_TLS(TMP) \
.ifnc TMP, lr; \
mov TMP, lr; \
cfi_register (lr, TMP); \
@ -74,6 +75,7 @@
.else; \
GET_TLS_BODY; \
.endif
#endif /* ARCH_HAS_HARD_TP */
/* Linux uses a negative return value to indicate syscall errors,
unlike most Unices, which use the condition codes' carry flag.