[PATCH 04/27] [AARCH64] Add PTR_REG, PTR_LOG_SIZE, and PTR_SIZE. Use it in LDST_PCREL and LDST_GLOBAL.

Yury Norov
2016-06-21T06:46:35Z

From: Andrew Pinski <apinski@cavium.com>

This patch adds a few extra macros which are useful for ILP32 and updates
PTR_MANGLE and PTR_DEMANGLE to use the some of the new macros.

* sysdeps/aarch64/sysdep.h (PTR_REG): New macro.
(PTR_LOG_SIZE): New macro.
(PTR_SIZE): New macro.
(LDST_PCREL): Use arguments as register numbers rather register names.
Use PTR_REG for the register when loading.
* sysdeps/unix/sysv/linux/aarch64/sysdep.h (PTR_MANGLE): Add a comment
about that the arguments are register numbers rather register names.
(PTR_DEMANGLE): Likewise.
* sysdeps/aarch64/__longjmp.S (__longjmp): Update calls to PTR_DEMANGLE.
* sysdeps/aarch64/setjmp.S (__sigsetjmp): Update calls to PTR_MANGLE.

Signed-off-by: Yury Norov <ynorov@caviumnetworks.com>
---
sysdeps/aarch64/__longjmp.S | 4 ++--
sysdeps/aarch64/setjmp.S | 4 ++--
sysdeps/aarch64/sysdep.h | 28 ++++++++++++++++++----------
sysdeps/unix/sysv/linux/aarch64/sysdep.h | 8 ++++++--
4 files changed, 28 insertions(+), 16 deletions(-)

diff --git a/sysdeps/aarch64/__longjmp.S b/sysdeps/aarch64/__longjmp.S
index 65116be..58332be 100644
--- a/sysdeps/aarch64/__longjmp.S
+++ b/sysdeps/aarch64/__longjmp.S
@@ -53,7 +53,7 @@ ENTRY (__longjmp)
ldp x27, x28, [x0, #JB_X27<<3]
#ifdef PTR_DEMANGLE
ldp x29, x4, [x0, #JB_X29<<3]
- PTR_DEMANGLE (x30, x4, x3, x2)
+ PTR_DEMANGLE (30, 4, 3, 2)
#else
ldp x29, x30, [x0, #JB_X29<<3]
#endif
@@ -98,7 +98,7 @@ ENTRY (__longjmp)
cfi_same_value(d15)
#ifdef PTR_DEMANGLE
ldr x4, [x0, #JB_SP<<3]
- PTR_DEMANGLE (x5, x4, x3, x2)
+ PTR_DEMANGLE (5, 4, 3, 2)
#else
ldr x5, [x0, #JB_SP<<3]
#endif
diff --git a/sysdeps/aarch64/setjmp.S b/sysdeps/aarch64/setjmp.S
index 22f4368..da83f19 100644
--- a/sysdeps/aarch64/setjmp.S
+++ b/sysdeps/aarch64/setjmp.S
@@ -42,7 +42,7 @@ ENTRY (__sigsetjmp)
stp x27, x28, [x0, #JB_X27<<3]

#ifdef PTR_MANGLE
- PTR_MANGLE (x4, x30, x3, x2)
+ PTR_MANGLE (4, 30, 3, 2)
stp x29, x4, [x0, #JB_X29<<3]
#else
stp x29, x30, [x0, #JB_X29<<3]
@@ -57,7 +57,7 @@ ENTRY (__sigsetjmp)
stp d14, d15, [x0, #JB_D14<<3]
#ifdef PTR_MANGLE
mov x4, sp
- PTR_MANGLE (x5, x4, x3, x2)
+ PTR_MANGLE (5, 4, 3, 2)
str x5, [x0, #JB_SP<<3]
#else
mov x2, sp
diff --git a/sysdeps/aarch64/sysdep.h b/sysdeps/aarch64/sysdep.h
index 4cb028f..f2ea821 100644
--- a/sysdeps/aarch64/sysdep.h
+++ b/sysdeps/aarch64/sysdep.h
@@ -23,10 +23,16 @@

#ifdef __LP64__
#define AARCH64_R(NAME) R_AARCH64_ ## NAME
+#define PTR_REG(n) x##n
+#define PTR_LOG_SIZE 3
#else
#define AARCH64_R(NAME) R_AARCH64_P32_ ## NAME
+#define PTR_REG(n) w##n
+#define PTR_LOG_SIZE 2
#endif

+#define PTR_SIZE (1<<PTR_LOG_SIZE)
+
#ifdef __ASSEMBLER__

/* Syntactic details of assembler. */
@@ -87,16 +93,18 @@
# define L(name) .L##name
#endif

-/* Load or store to/from a pc-relative EXPR into/from R, using T. */
-#define LDST_PCREL(OP, R, T, EXPR) \
- adrp T, EXPR; \
- OP R, [T, #:lo12:EXPR];\
-
-/* Load or store to/from a got-relative EXPR into/from R, using T. */
-#define LDST_GLOBAL(OP, R, T, EXPR) \
- adrp T, :got:EXPR; \
- ldr T, [T, #:got_lo12:EXPR];\
- OP R, [T];
+/* Load or store to/from a pc-relative EXPR into/from R, using T.
+ Note R and T are register numbers and not register names. */
+#define LDST_PCREL(OP, R, T, EXPR) \
+ adrp x##T, EXPR; \
+ OP PTR_REG (R), [x##T, #:lo12:EXPR]; \
+
+/* Load or store to/from a got-relative EXPR into/from R, using T.
+ Note R and T are register numbers and not register names. */
+#define LDST_GLOBAL(OP, R, T, EXPR) \
+ adrp x##T, :got:EXPR; \
+ ldr PTR_REG (T), [x##T, #:got_lo12:EXPR]; \
+ OP x##R, [x##T];

/* Since C identifiers are not normally prefixed with an underscore
on this system, the asm identifier `syscall_error' intrudes on the
diff --git a/sysdeps/unix/sysv/linux/aarch64/sysdep.h b/sysdeps/unix/sysv/linux/aarch64/sysdep.h
index a397e50..1ffabc2 100644
--- a/sysdeps/unix/sysv/linux/aarch64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/aarch64/sysdep.h
@@ -250,12 +250,14 @@
(!defined SHARED && (IS_IN (libc) \
|| IS_IN (libpthread))))
# ifdef __ASSEMBLER__
+/* Note, dst, src, guard, and tmp are all register numbers rather than
+ register names so they will work with both ILP32 and LP64. */
# define PTR_MANGLE(dst, src, guard, tmp) \
LDST_PCREL (ldr, guard, tmp, C_SYMBOL_NAME(__pointer_chk_guard_local)); \
PTR_MANGLE2 (dst, src, guard)
/* Use PTR_MANGLE2 for efficiency if guard is already loaded. */
# define PTR_MANGLE2(dst, src, guard)\
- eor dst, src, guard
+ eor x##dst, x##src, x##guard
# define PTR_DEMANGLE(dst, src, guard, tmp)\
PTR_MANGLE (dst, src, guard, tmp)
# define PTR_DEMANGLE2(dst, src, guard)\
@@ -268,12 +270,14 @@ extern uintptr_t __pointer_chk_guard_local attribute_relro attribute_hidden;
# endif
#else
# ifdef __ASSEMBLER__
+/* Note, dst, src, guard, and tmp are all register numbers rather than
+ register names so they will work with both ILP32 and LP64. */
# define PTR_MANGLE(dst, src, guard, tmp) \
LDST_GLOBAL (ldr, guard, tmp, C_SYMBOL_NAME(__pointer_chk_guard)); \
PTR_MANGLE2 (dst, src, guard)
/* Use PTR_MANGLE2 for efficiency if guard is already loaded. */
# define PTR_MANGLE2(dst, src, guard)\
- eor dst, src, guard
+ eor x##dst, x##src, x##guard
# define PTR_DEMANGLE(dst, src, guard, tmp)\
PTR_MANGLE (dst, src, guard, tmp)
# define PTR_DEMANGLE2(dst, src, guard)\
--
2.7.4