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- #ifndef _BITS_SYSCALLS_H
- #define _BITS_SYSCALLS_H
- #ifndef _SYSCALL_H
- # error "Never use <bits/syscalls.h> directly; include <sys/syscall.h> instead."
- #endif
- #ifndef __ASSEMBLER__
- /* Assume all syscalls are done from PIC code just to be
- * safe. The worst case scenario is that you lose a register
- * and save/restore r19 across the syscall. */
- #define PIC
- /* Definition taken from glibc 2.3.3
- * sysdeps/unix/sysv/linux/hppa/sysdep.h
- */
- #ifdef PIC
- /* WARNING: CANNOT BE USED IN A NOP! */
- # define K_STW_ASM_PIC " copy %%r19, %%r4\n"
- # define K_LDW_ASM_PIC " copy %%r4, %%r19\n"
- # define K_USING_GR4 "%r4",
- #else
- # define K_STW_ASM_PIC " \n"
- # define K_LDW_ASM_PIC " \n"
- # define K_USING_GR4
- #endif
- /* 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 K_CALL_CLOB_REGS "%r1", "%r2", K_USING_GR4 \
- "%r20", "%r29", "%r31"
- #define INTERNAL_SYSCALL_NCS(name, err, nr, args...) ({ \
- register unsigned long __res __asm__("r28"); \
- K_LOAD_ARGS_##nr(args) \
- /* FIXME: HACK stw/ldw r19 around syscall */ \
- __asm__ __volatile__( \
- K_STW_ASM_PIC \
- " ble 0x100(%%sr2, %%r0)\n" \
- " ldi %1, %%r20\n" \
- K_LDW_ASM_PIC \
- : "=r" (__res) \
- : "i" (name) K_ASM_ARGS_##nr \
- : "memory", K_CALL_CLOB_REGS K_CLOB_ARGS_##nr \
- ); \
- __res; \
- })
- #define K_LOAD_ARGS_0()
- #define K_LOAD_ARGS_1(r26) \
- register unsigned long __r26 __asm__("r26") = (unsigned long)(r26); \
- K_LOAD_ARGS_0()
- #define K_LOAD_ARGS_2(r26,r25) \
- register unsigned long __r25 __asm__("r25") = (unsigned long)(r25); \
- K_LOAD_ARGS_1(r26)
- #define K_LOAD_ARGS_3(r26,r25,r24) \
- register unsigned long __r24 __asm__("r24") = (unsigned long)(r24); \
- K_LOAD_ARGS_2(r26,r25)
- #define K_LOAD_ARGS_4(r26,r25,r24,r23) \
- register unsigned long __r23 __asm__("r23") = (unsigned long)(r23); \
- K_LOAD_ARGS_3(r26,r25,r24)
- #define K_LOAD_ARGS_5(r26,r25,r24,r23,r22) \
- register unsigned long __r22 __asm__("r22") = (unsigned long)(r22); \
- K_LOAD_ARGS_4(r26,r25,r24,r23)
- #define K_LOAD_ARGS_6(r26,r25,r24,r23,r22,r21) \
- register unsigned long __r21 __asm__("r21") = (unsigned long)(r21); \
- K_LOAD_ARGS_5(r26,r25,r24,r23,r22)
- /* Even with zero args we use r20 for the syscall number */
- #define K_ASM_ARGS_0
- #define K_ASM_ARGS_1 K_ASM_ARGS_0, "r" (__r26)
- #define K_ASM_ARGS_2 K_ASM_ARGS_1, "r" (__r25)
- #define K_ASM_ARGS_3 K_ASM_ARGS_2, "r" (__r24)
- #define K_ASM_ARGS_4 K_ASM_ARGS_3, "r" (__r23)
- #define K_ASM_ARGS_5 K_ASM_ARGS_4, "r" (__r22)
- #define K_ASM_ARGS_6 K_ASM_ARGS_5, "r" (__r21)
- /* The registers not listed as inputs but clobbered */
- #define K_CLOB_ARGS_6
- #define K_CLOB_ARGS_5 K_CLOB_ARGS_6, "%r21"
- #define K_CLOB_ARGS_4 K_CLOB_ARGS_5, "%r22"
- #define K_CLOB_ARGS_3 K_CLOB_ARGS_4, "%r23"
- #define K_CLOB_ARGS_2 K_CLOB_ARGS_3, "%r24"
- #define K_CLOB_ARGS_1 K_CLOB_ARGS_2, "%r25"
- #define K_CLOB_ARGS_0 K_CLOB_ARGS_1, "%r26"
- #endif /* __ASSEMBLER__ */
- #endif /* _BITS_SYSCALLS_H */
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