#include "config.h"
#ifndef ASM_LINE_SEP
-#define ASM_LINE_SEP ;
+# define ASM_LINE_SEP ;
#endif
#undef SYS_ify
#define SYS_ify(syscall_name) (__NR_##syscall_name)
+#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",
+#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
+#endif
#ifdef __ASSEMBLER__
.text ASM_LINE_SEP \
.export C_SYMBOL_NAME(name) ASM_LINE_SEP \
.type C_SYMBOL_NAME(name),@function ASM_LINE_SEP \
- C_LABEL(name) \
- CALL_MCOUNT
-
-#define ret \
- bv 0(2) ASM_LINE_SEP \
- nop
-
-#define ret_NOERRNO \
- bv 0(2) ASM_LINE_SEP \
- nop
+ C_LABEL(name) ASM_LINE_SEP \
+ CALL_MCOUNT ASM_LINE_SEP
#undef END
-#define END(name) \
-1: .size C_SYMBOL_NAME(name),1b-C_SYMBOL_NAME(name)
+#define END(name) \
+1: ASM_LINE_SEP \
+.size C_SYMBOL_NAME(name),1b-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. */
nop
*/
-#define PSEUDO(name, syscall_name, args) \
- ENTRY (name) \
- DO_CALL(syscall_name, args) ASM_LINE_SEP \
- nop
+#define PSEUDO(name, syscall_name, args) \
+ ENTRY (name) \
+ DO_CALL(syscall_name, 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
#undef PSEUDO_END
-#define PSEUDO_END(name) \
+#define PSEUDO_END(name) \
END (name)
-#define PSEUDO_NOERRNO(name, syscall_name, args) \
- ENTRY (name) \
- DO_CALL(syscall_name, args) ASM_LINE_SEP \
- nop
+/* 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 \
+ nop ASM_LINE_SEP
+
+#define ret_NOERRNO ret
#undef PSEUDO_END_NOERRNO
-#define PSEUDO_END_NOERRNO(name) \
+#define PSEUDO_END_NOERRNO(name) \
END (name)
+/* 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
+
+#define ret_ERRVAL ret
+
+#undef PSEUDO_END_ERRVAL
+#define PSEUDO_END_ERRVAL(name) \
+ END(name)
+
+#undef JUMPTARGET
#define JUMPTARGET(name) name
#define SYSCALL_PIC_SETUP /* Nothing. */
+
+/* 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
+ into the return address! */
+#define DEFAULT_SYSCALL_ERROR_HANDLER \
+ .import __errno_location,code ASM_LINE_SEP \
+ /* branch to errno handler */ ASM_LINE_SEP \
+ bl __errno_location,%rp ASM_LINE_SEP
+
+/* Here are the myriad of configuration options that the above can
+ work for... what we've done is provide the framework for future
+ changes if required to each section */
+
+#ifdef PIC
+# if RTLD_PRIVATE_ERRNO
+# define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
+# else /* !RTLD_PRIVATE_ERRNO */
+# if defined _LIBC_REENTRANT
+# define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
+# else /* !_LIBC_REENTRANT */
+# define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
+# endif /* _LIBC_REENTRANT */
+# endif /* RTLD_PRIVATE_ERRNO */
+#else
+# ifndef _LIBC_REENTRANT
+# define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
+# else
+# define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
+# endif
+#endif
+
+
/* Linux takes system call arguments in registers:
syscall number gr20
arg 1 gr26
#undef DO_CALL
#define DO_CALL(syscall_name, args) \
- DOARGS_##args \
+ DOARGS_##args ASM_LINE_SEP \
+ STW_PIC 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 \
- stw %rp, -20(%sr0,%r30) ASM_LINE_SEP \
- stw %ret0, -24(%sr0,%r30) ASM_LINE_SEP \
- .import __errno_location,code ASM_LINE_SEP \
- bl __errno_location,%rp ASM_LINE_SEP \
- ldo 64(%r30), %r30 ASM_LINE_SEP \
- ldo -64(%r30), %r30 ASM_LINE_SEP \
- ldw -24(%r30), %r26 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 \
+ 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 \
+ /* 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 \
+ /* Store into errno location */ ASM_LINE_SEP \
stw %r26, 0(%sr0,%ret0) ASM_LINE_SEP \
+ /* return -1 as error */ ASM_LINE_SEP \
ldo -1(%r0), %ret0 ASM_LINE_SEP \
- ldw -20(%r30), %rp ASM_LINE_SEP \
+ ldw -20(%sr0,%sp), %rp ASM_LINE_SEP \
0: ASM_LINE_SEP \
+ UNDOARGS_##args 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
+/* Here, we return the ERRVAL in assembly, note we don't call the
+ error handler function, but we do 'negate' the return _IF_
+ it's an error. Not sure if this is the right semantic. */
+
+#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 \
+ 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 */
#else
+/* GCC has to be warned that a syscall may clobber all the ABI
+ registers listed as "caller-saves", see page 8, Table 2
+ in section 2.2.6 of the PA-RISC RUN-TIME architecture
+ document. However! r28 is the result and will conflict with
+ the clobber list so it is left out. Also the input arguments
+ 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
+ across the syscall. */
+
+#define CALL_CLOB_REGS "%r1", "%r2", USING_GR4 \
+ "%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 */ \
+ 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; \
+ } \
+ if ( (unsigned long)__sys_res >= (unsigned long)-4095 ){ \
+ __set_errno(-__sys_res); \
+ __sys_res = -1; \
+ } \
+ __sys_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.
+ 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)
+
+/* Equivalent to (val < 0)&&(val > -4095) which is what we want */
+#undef INTERNAL_SYSCALL_ERROR_P
+#define INTERNAL_SYSCALL_ERROR_P(val, err) \
+ ((unsigned long)val >= (unsigned long)-4095)
+
+#undef INTERNAL_SYSCALL_ERRNO
+#define INTERNAL_SYSCALL_ERRNO(val, err) (-(val))
+
+/* 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( \
- "ble 0x100(%%sr2, %%r0)\n\t" \
- " ldi %1, %%r20" \
+ STW_ASM_PIC \
+ " ble 0x100(%%sr2, %%r0)\n" \
+ " ldi %1, %%r20\n" \
+ LDW_ASM_PIC \
: "=r" (__res) \
: "i" (SYS_ify(name)) ASM_ARGS_##nr \
); \
- __sys_res = __res; \
- } \
- if ((unsigned long)__sys_res >= (unsigned long)-4095) { \
- __set_errno(-__sys_res); \
- __sys_res = -1; \
+ : 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; \
+ 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; \
+ 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; \
+ 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; \
+ 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; \
+ 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; \
+ 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
-#define ASM_ARGS_1 , "r" (__r26)
-#define ASM_ARGS_2 , "r" (__r26), "r" (__r25)
-#define ASM_ARGS_3 , "r" (__r26), "r" (__r25), "r" (__r24)
-#define ASM_ARGS_4 , "r" (__r26), "r" (__r25), "r" (__r24), "r" (__r23)
-#define ASM_ARGS_5 , "r" (__r26), "r" (__r25), "r" (__r24), "r" (__r23), "r" (__r22)
-#define ASM_ARGS_6 , "r" (__r26), "r" (__r25), "r" (__r24), "r" (__r23), "r" (__r22), "r" (__r21)
+#define ASM_ARGS_1 ASM_ARGS_0, "r" (__r26)
+#define ASM_ARGS_2 ASM_ARGS_1, "r" (__r25)
+#define ASM_ARGS_3 ASM_ARGS_2, "r" (__r24)
+#define ASM_ARGS_4 ASM_ARGS_3, "r" (__r23)
+#define ASM_ARGS_5 ASM_ARGS_4, "r" (__r22)
+#define ASM_ARGS_6 ASM_ARGS_5, "r" (__r21)
+
+/* The registers not listed as inputs but clobbered */
+#define CLOB_ARGS_6
+#define CLOB_ARGS_5 CLOB_ARGS_6, "%r21"
+#define CLOB_ARGS_4 CLOB_ARGS_5, "%r22"
+#define CLOB_ARGS_3 CLOB_ARGS_4, "%r23"
+#define CLOB_ARGS_2 CLOB_ARGS_3, "%r24"
+#define CLOB_ARGS_1 CLOB_ARGS_2, "%r25"
+#define CLOB_ARGS_0 CLOB_ARGS_1, "%r26"
#endif /* __ASSEMBLER__ */
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