#include <asm/unistd.h>
#include <sysdeps/generic/sysdep.h>
#include <sys/syscall.h>
-#include "config.h"
-#ifndef ASM_LINE_SEP
-# define ASM_LINE_SEP ;
-#endif
+#undef ASM_LINE_SEP
+#define ASM_LINE_SEP !
#undef SYS_ify
#define SYS_ify(syscall_name) (__NR_##syscall_name)
+/* WARNING: TREG must be a callee saves register so
+ that it doesn't have to be restored after a call
+ to another function */
#ifdef PIC
-/* WARNING: CANNOT BE USED IN A NOP! */
-# define STW_PIC stw %r19, -32(%sr0, %sp) ASM_LINE_SEP
-# define LDW_PIC ldw -32(%sr0, %sp), %r19 ASM_LINE_SEP
-# define STW_ASM_PIC " copy %%r19, %%r4\n"
-# define LDW_ASM_PIC " copy %%r4, %%r19\n"
-# define USING_GR4 "%r4",
+# define TREG %r3
+# define SAVE_PIC(SREG) copy %r19, SREG ASM_LINE_SEP
+# define LOAD_PIC(LREG) copy LREG, %r19 ASM_LINE_SEP
+/* Inline assembly defines */
+# define TREG_ASM "%r4" /* Cant clobber r3, it holds framemarker */
+# define SAVE_ASM_PIC " copy %%r19, %" TREG_ASM "\n"
+# define LOAD_ASM_PIC " copy %" TREG_ASM ", %%r19\n"
+# define USING_TREG TREG_ASM,
#else
-# define STW_PIC ASM_LINE_SEP
-# define LDW_PIC ASM_LINE_SEP
-# define STW_ASM_PIC " \n"
-# define LDW_ASM_PIC " \n"
-# define USING_GR4
+# define TREG %r3
+# define SAVE_PIC(SREG) nop ASM_LINE_SEP
+# define LOAD_PIC(LREG) nop ASM_LINE_SEP
+/* Inline assembly defines */
+# define TREG_ASM
+# define SAVE_ASM_PIC "nop \n"
+# define LOAD_ASM_PIC "nop \n"
+# define USING_TREG
#endif
#ifdef __ASSEMBLER__
/* We don't want the label for the error handle to be global when we define
it here. */
-#ifdef PIC
+/*#ifdef PIC
# define SYSCALL_ERROR_LABEL 0f
#else
# define SYSCALL_ERROR_LABEL syscall_error
-#endif
+#endif*/
+
+/* Argument manipulation from the stack for preparing to
+ make a syscall */
+
+#define DOARGS_0 /* nothing */
+#define DOARGS_1 /* nothing */
+#define DOARGS_2 /* nothing */
+#define DOARGS_3 /* nothing */
+#define DOARGS_4 /* nothing */
+#define DOARGS_5 ldw -52(%sp), %r22 ASM_LINE_SEP
+#define DOARGS_6 DOARGS_5 ldw -56(%sp), %r21 ASM_LINE_SEP
+
+#define UNDOARGS_0 /* nothing */
+#define UNDOARGS_1 /* nothing */
+#define UNDOARGS_2 /* nothing */
+#define UNDOARGS_3 /* nothing */
+#define UNDOARGS_4 /* nothing */
+#define UNDOARGS_5 /* nothing */
+#define UNDOARGS_6 /* nothing */
/* Define an entry point visible from C.
There is currently a bug in gdb which prevents us from specifying
incomplete stabs information. Fake some entries here which specify
the current source file. */
-#define ENTRY(name) \
- .text ASM_LINE_SEP \
- .export C_SYMBOL_NAME(name) ASM_LINE_SEP \
- .type C_SYMBOL_NAME(name),@function ASM_LINE_SEP \
- C_LABEL(name) ASM_LINE_SEP \
- CALL_MCOUNT ASM_LINE_SEP
+#define ENTRY(name) \
+ .text ASM_LINE_SEP \
+ .align ALIGNARG(4) ASM_LINE_SEP \
+ .export C_SYMBOL_NAME(name) ASM_LINE_SEP \
+ .type C_SYMBOL_NAME(name),@function ASM_LINE_SEP \
+ C_LABEL(name) ASM_LINE_SEP \
+ .PROC ASM_LINE_SEP \
+ .CALLINFO FRAME=64,CALLS,SAVE_RP,ENTRY_GR=3 ASM_LINE_SEP \
+ .ENTRY ASM_LINE_SEP \
+ /* SAVE_RP says we do */ ASM_LINE_SEP \
+ stw %rp, -20(%sr0,%sp) ASM_LINE_SEP \
+ /*FIXME: Call mcount? (carefull with stack!) */
+
+/* Some syscall wrappers do not call other functions, and
+ hence are classified as leaf, so add NO_CALLS for gdb */
+#define ENTRY_LEAF(name) \
+ .text ASM_LINE_SEP \
+ .align ALIGNARG(4) ASM_LINE_SEP \
+ .export C_SYMBOL_NAME(name) ASM_LINE_SEP \
+ .type C_SYMBOL_NAME(name),@function ASM_LINE_SEP \
+ C_LABEL(name) ASM_LINE_SEP \
+ .PROC ASM_LINE_SEP \
+ .CALLINFO FRAME=64,NO_CALLS,SAVE_RP,ENTRY_GR=3 ASM_LINE_SEP \
+ .ENTRY ASM_LINE_SEP \
+ /* SAVE_RP says we do */ ASM_LINE_SEP \
+ stw %rp, -20(%sr0,%sp) ASM_LINE_SEP \
+ /*FIXME: Call mcount? (carefull with stack!) */
#undef END
#define END(name) \
-1: ASM_LINE_SEP \
-.size C_SYMBOL_NAME(name),1b-C_SYMBOL_NAME(name) ASM_LINE_SEP
+ .EXIT ASM_LINE_SEP \
+ .PROCEND ASM_LINE_SEP \
+.size C_SYMBOL_NAME(name), .-C_SYMBOL_NAME(name) ASM_LINE_SEP
-/* If compiled for profiling, call `mcount' at the start of each function. */
-/* No, don't bother. gcc will put the call in for us. */
+/* If compiled for profiling, call `mcount' at the start
+ of each function. No, don't bother. gcc will put the
+ call in for us. */
#define CALL_MCOUNT /* Do nothing. */
/* syscall wrappers consist of
*/
#define PSEUDO(name, syscall_name, args) \
- ENTRY (name) \
- DO_CALL(syscall_name, args) ASM_LINE_SEP \
+ ENTRY (name) ASM_LINE_SEP \
+ /* If necc. load args from stack */ ASM_LINE_SEP \
+ DOARGS_##args ASM_LINE_SEP \
+ DO_CALL (syscall_name, args) ASM_LINE_SEP \
+ UNDOARGS_##args ASM_LINE_SEP \
nop ASM_LINE_SEP
#define ret \
- /* Return value set by ERRNO code */ ASM_LINE_SEP \
- bv 0(2) ASM_LINE_SEP \
- nop ASM_LINE_SEP
+ /* Return value set by ERRNO code */ ASM_LINE_SEP \
+ bv,n 0(2) ASM_LINE_SEP
#undef PSEUDO_END
#define PSEUDO_END(name) \
/* We don't set the errno on the return from the syscall */
#define PSEUDO_NOERRNO(name, syscall_name, args) \
- ENTRY (name) \
- DO_CALL_NOERRNO(syscall_name, args) ASM_LINE_SEP \
+ ENTRY_LEAF (name) ASM_LINE_SEP \
+ DOARGS_##args ASM_LINE_SEP \
+ DO_CALL_NOERRNO (syscall_name, args) ASM_LINE_SEP \
+ UNDOARGS_##args ASM_LINE_SEP \
nop ASM_LINE_SEP
#define ret_NOERRNO ret
/* This has to return the error value */
#undef PSEUDO_ERRVAL
#define PSEUDO_ERRVAL(name, syscall_name, args) \
- ENTRY(name) \
- DO_CALL_ERRVAL(syscall_name, args) ASM_LINE_SEP \
- nop ASM_LINE_SEP
+ ENTRY_LEAF (name) ASM_LINE_SEP \
+ DOARGS_##args ASM_LINE_SEP \
+ DO_CALL_ERRVAL (syscall_name, args) ASM_LINE_SEP \
+ UNDOARGS_##args ASM_LINE_SEP \
+ nop ASM_LINE_SEP
#define ret_ERRVAL ret
#define SYSCALL_PIC_SETUP /* Nothing. */
-/* All the syscall assembly macros rely on finding the approriate
+/* FIXME: This comment is not true.
+ * All the syscall assembly macros rely on finding the approriate
SYSCALL_ERROR_LABEL or rather HANDLER. */
/* int * __errno_location(void) so you have to store your value
arg 2 gr25
arg 3 gr24
arg 4 gr23
- arg 5 -52(gr30)
- arg 6 -56(gr30)
+ arg 5 -52(sp)
+ arg 6 -56(sp)
gr22 and gr21 are caller-saves, so we can just load the arguments
there and generally be happy. */
* is intended to mimic the if (__sys_res...)
* code inside INLINE_SYSCALL
*/
+#define NO_ERROR -0x1000
#undef DO_CALL
#define DO_CALL(syscall_name, args) \
- DOARGS_##args ASM_LINE_SEP \
- STW_PIC ASM_LINE_SEP \
+ copy TREG,%r1 ASM_LINE_SEP \
+ copy %sp,TREG ASM_LINE_SEP \
+ /* Create a frame */ ASM_LINE_SEP \
+ stwm %r1, 64(%sp) ASM_LINE_SEP \
+ stw %rp, -20(%sp) ASM_LINE_SEP \
+ stw TREG, -4(%sp) ASM_LINE_SEP \
+ /* Save r19 */ ASM_LINE_SEP \
+ SAVE_PIC(TREG) ASM_LINE_SEP \
/* Do syscall, delay loads # */ ASM_LINE_SEP \
ble 0x100(%sr2,%r0) ASM_LINE_SEP \
ldi SYS_ify (syscall_name), %r20 ASM_LINE_SEP \
- ldi -0x1000,%r1 ASM_LINE_SEP \
- cmpb,>>=,n %r1,%ret0,0f ASM_LINE_SEP \
- /* save rp or we get lost */ ASM_LINE_SEP \
- stw %rp, -20(%sr0,%sp) ASM_LINE_SEP \
- /* Restore r19 from frame */ ASM_LINE_SEP \
- LDW_PIC ASM_LINE_SEP \
- stw %ret0, -24(%sr0,%sp) ASM_LINE_SEP \
+ ldi NO_ERROR,%r1 ASM_LINE_SEP \
+ cmpb,>>=,n %r1,%ret0,L(pre_end) ASM_LINE_SEP \
+ /* Restore r19 from TREG */ ASM_LINE_SEP \
+ LOAD_PIC(TREG) /* delay */ ASM_LINE_SEP \
SYSCALL_ERROR_HANDLER ASM_LINE_SEP \
- /* create frame */ ASM_LINE_SEP \
- ldo 64(%sp), %sp ASM_LINE_SEP \
- ldo -64(%sp), %sp ASM_LINE_SEP \
+ /* Use TREG for temp storage */ ASM_LINE_SEP \
+ copy %ret0, TREG /* delay */ ASM_LINE_SEP \
/* OPTIMIZE: Don't reload r19 */ ASM_LINE_SEP \
/* do a -1*syscall_ret0 */ ASM_LINE_SEP \
- ldw -24(%sr0,%sp), %r26 ASM_LINE_SEP \
- sub %r0, %r26, %r26 ASM_LINE_SEP \
+ sub %r0, TREG, TREG ASM_LINE_SEP \
/* Store into errno location */ ASM_LINE_SEP \
- stw %r26, 0(%sr0,%ret0) ASM_LINE_SEP \
+ stw TREG, 0(%sr0,%ret0) ASM_LINE_SEP \
/* return -1 as error */ ASM_LINE_SEP \
ldo -1(%r0), %ret0 ASM_LINE_SEP \
- ldw -20(%sr0,%sp), %rp ASM_LINE_SEP \
-0: ASM_LINE_SEP \
- UNDOARGS_##args ASM_LINE_SEP
+L(pre_end): ASM_LINE_SEP \
+ /* Restore return pointer */ ASM_LINE_SEP \
+ ldw -84(%sp),%rp ASM_LINE_SEP \
+ /* Restore our frame, restoring TREG */ ASM_LINE_SEP \
+ ldwm -64(%sp), TREG ASM_LINE_SEP
/* We do nothing with the return, except hand it back to someone else */
#undef DO_CALL_NOERRNO
#define DO_CALL_NOERRNO(syscall_name, args) \
- DOARGS_##args \
/* No need to store r19 */ ASM_LINE_SEP \
ble 0x100(%sr2,%r0) ASM_LINE_SEP \
ldi SYS_ify (syscall_name), %r20 ASM_LINE_SEP \
- /* Caller will restore r19 */ ASM_LINE_SEP \
- UNDOARGS_##args
+ /* Caller will restore r19 */ ASM_LINE_SEP
/* Here, we return the ERRVAL in assembly, note we don't call the
error handler function, but we do 'negate' the return _IF_
#undef DO_CALL_ERRVAL
#define DO_CALL_ERRVAL(syscall_name, args) \
- DOARGS_##args ASM_LINE_SEP \
/* No need to store r19 */ ASM_LINE_SEP \
ble 0x100(%sr2,%r0) ASM_LINE_SEP \
ldi SYS_ify (syscall_name), %r20 ASM_LINE_SEP \
/* Caller will restore r19 */ ASM_LINE_SEP \
- ldi -0x1000,%r1 ASM_LINE_SEP \
+ ldi NO_ERROR,%r1 ASM_LINE_SEP \
cmpb,>>=,n %r1,%ret0,0f ASM_LINE_SEP \
sub %r0, %ret0, %ret0 ASM_LINE_SEP \
-0: ASM_LINE_SEP \
- UNDOARGS_##args ASM_LINE_SEP
-
-#define DOARGS_0 /* nothing */
-#define DOARGS_1 /* nothing */
-#define DOARGS_2 /* nothing */
-#define DOARGS_3 /* nothing */
-#define DOARGS_4 /* nothing */
-#define DOARGS_5 ldw -52(%r30), %r22 ASM_LINE_SEP
-#define DOARGS_6 ldw -52(%r30), %r22 ASM_LINE_SEP \
- ldw -56(%r30), %r21 ASM_LINE_SEP
-
+0: ASM_LINE_SEP
-#define UNDOARGS_0 /* nothing */
-#define UNDOARGS_1 /* nothing */
-#define UNDOARGS_2 /* nothing */
-#define UNDOARGS_3 /* nothing */
-#define UNDOARGS_4 /* nothing */
-#define UNDOARGS_5 /* nothing */
-#define UNDOARGS_6 /* nothing */
#else
registers r20 -> r26 will conflict with the list so they
are treated specially. Although r19 is clobbered by the syscall
we cannot say this because it would violate ABI, thus we say
- r4 is clobbered and use that register to save/restore r19
+ TREG is clobbered and use that register to save/restore r19
across the syscall. */
-#define CALL_CLOB_REGS "%r1", "%r2", USING_GR4 \
+#define CALL_CLOB_REGS "%r1", "%r2", USING_TREG \
"%r20", "%r29", "%r31"
#undef INLINE_SYSCALL
-#define INLINE_SYSCALL(name, nr, args...) ({ \
+#define INLINE_SYSCALL(name, nr, args...) \
+({ \
long __sys_res; \
{ \
register unsigned long __res asm("r28"); \
LOAD_ARGS_##nr(args) \
- /* FIXME: HACK stw/ldw r19 around syscall */ \
+ /* FIXME: HACK save/load r19 around syscall */ \
asm volatile( \
- STW_ASM_PIC \
+ SAVE_ASM_PIC \
" ble 0x100(%%sr2, %%r0)\n" \
" ldi %1, %%r20\n" \
- LDW_ASM_PIC \
+ LOAD_ASM_PIC \
: "=r" (__res) \
: "i" (SYS_ify(name)) ASM_ARGS_##nr \
- : CALL_CLOB_REGS CLOB_ARGS_##nr \
+ : "memory", CALL_CLOB_REGS CLOB_ARGS_##nr \
); \
__sys_res = (long)__res; \
} \
/* INTERNAL_SYSCALL_DECL - Allows us to setup some function static
value to use within the context of the syscall
INTERNAL_SYSCALL_ERROR_P - Returns 0 if it wasn't an error, 1 otherwise
- You are allowed to use the syscall result (val) and the DECL error variable
- to determine what went wrong.
+ You are allowed to use the syscall result (val) and the DECL error
+ variable to determine what went wrong.
INTERLAL_SYSCALL_ERRNO - Munges the val/err pair into the error number.
In our case we just flip the sign. */
#undef INTERNAL_SYSCALL_DECL
-#define INTERNAL_SYSCALL_DECL(err) do { } while (0)
+#define INTERNAL_SYSCALL_DECL(err)
/* Equivalent to (val < 0)&&(val > -4095) which is what we want */
#undef INTERNAL_SYSCALL_ERROR_P
/* Similar to INLINE_SYSCALL but we don't set errno */
#undef INTERNAL_SYSCALL
-#define INTERNAL_SYSCALL(name, err, nr, args...) \
-({ \
- long __sys_res; \
- { \
- register unsigned long __res asm("r28"); \
- LOAD_ARGS_##nr(args) \
- /* FIXME: HACK stw/ldw r19 around syscall */ \
- asm volatile( \
- STW_ASM_PIC \
- " ble 0x100(%%sr2, %%r0)\n" \
- " ldi %1, %%r20\n" \
- LDW_ASM_PIC \
- : "=r" (__res) \
- : "i" (SYS_ify(name)) ASM_ARGS_##nr \
- : CALL_CLOB_REGS CLOB_ARGS_##nr \
- ); \
- __sys_res = (long)__res; \
- } \
- __sys_res; \
+#define INTERNAL_SYSCALL(name, err, nr, args...) \
+({ \
+ long __sys_res; \
+ { \
+ register unsigned long __res asm("r28"); \
+ LOAD_ARGS_##nr(args) \
+ /* FIXME: HACK save/load r19 around syscall */ \
+ asm volatile( \
+ SAVE_ASM_PIC \
+ " ble 0x100(%%sr2, %%r0)\n" \
+ " ldi %1, %%r20\n" \
+ LOAD_ASM_PIC \
+ : "=r" (__res) \
+ : "i" (SYS_ify(name)) ASM_ARGS_##nr \
+ : "memory", CALL_CLOB_REGS CLOB_ARGS_##nr \
+ ); \
+ __sys_res = (long)__res; \
+ } \
+ __sys_res; \
})
+
+/* The _NCS variant allows non-constant syscall numbers. */
+#undef INTERNAL_SYSCALL_NCS
+#define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \
+({ \
+ long __sys_res; \
+ { \
+ register unsigned long __res asm("r28"); \
+ LOAD_ARGS_##nr(args) \
+ /* FIXME: HACK save/load r19 around syscall */ \
+ asm volatile( \
+ SAVE_ASM_PIC \
+ " ble 0x100(%%sr2, %%r0)\n" \
+ " copy %1, %%r20\n" \
+ LOAD_ASM_PIC \
+ : "=r" (__res) \
+ : "r" (name) ASM_ARGS_##nr \
+ : "memory", CALL_CLOB_REGS CLOB_ARGS_##nr \
+ ); \
+ __sys_res = (long)__res; \
+ } \
+ __sys_res; \
+ })
+
+
+
#define LOAD_ARGS_0()
-#define LOAD_ARGS_1(r26) \
- register unsigned long __r26 __asm__("r26") = (unsigned long)(r26); \
- LOAD_ARGS_0()
-#define LOAD_ARGS_2(r26,r25) \
- register unsigned long __r25 __asm__("r25") = (unsigned long)(r25); \
- LOAD_ARGS_1(r26)
-#define LOAD_ARGS_3(r26,r25,r24) \
- register unsigned long __r24 __asm__("r24") = (unsigned long)(r24); \
- LOAD_ARGS_2(r26,r25)
-#define LOAD_ARGS_4(r26,r25,r24,r23) \
- register unsigned long __r23 __asm__("r23") = (unsigned long)(r23); \
- LOAD_ARGS_3(r26,r25,r24)
-#define LOAD_ARGS_5(r26,r25,r24,r23,r22) \
- register unsigned long __r22 __asm__("r22") = (unsigned long)(r22); \
- LOAD_ARGS_4(r26,r25,r24,r23)
-#define LOAD_ARGS_6(r26,r25,r24,r23,r22,r21) \
- register unsigned long __r21 __asm__("r21") = (unsigned long)(r21); \
- LOAD_ARGS_5(r26,r25,r24,r23,r22)
+#define LOAD_ARGS_1(r26) \
+ register unsigned long __r26 __asm__("r26") = (unsigned long)(r26); \
+ LOAD_ARGS_0()
+#define LOAD_ARGS_2(r26,r25) \
+ register unsigned long __r25 __asm__("r25") = (unsigned long)(r25); \
+ LOAD_ARGS_1(r26)
+#define LOAD_ARGS_3(r26,r25,r24) \
+ register unsigned long __r24 __asm__("r24") = (unsigned long)(r24); \
+ LOAD_ARGS_2(r26,r25)
+#define LOAD_ARGS_4(r26,r25,r24,r23) \
+ register unsigned long __r23 __asm__("r23") = (unsigned long)(r23); \
+ LOAD_ARGS_3(r26,r25,r24)
+#define LOAD_ARGS_5(r26,r25,r24,r23,r22) \
+ register unsigned long __r22 __asm__("r22") = (unsigned long)(r22); \
+ LOAD_ARGS_4(r26,r25,r24,r23)
+#define LOAD_ARGS_6(r26,r25,r24,r23,r22,r21) \
+ register unsigned long __r21 __asm__("r21") = (unsigned long)(r21); \
+ LOAD_ARGS_5(r26,r25,r24,r23,r22)
/* Even with zero args we use r20 for the syscall number */
#define ASM_ARGS_0
projects / platform / upstream / linaro-glibc.git / commitdiff