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$NetBSD: patch-ad,v 1.1 1998/08/23 06:22:17 garbled Exp $
--- /dev/null Sat Jul 18 04:38:07 1998
+++ machdep/syscall-alpha-netbsd-1.3.S Sat Jul 18 04:38:20 1998
@@ -0,0 +1,224 @@
+#include <machine/asm.h>
+#define CHMK() call_pal 0x83
+#define COMPAT_43
+#include <sys/syscall.h>
+#ifndef __CONCAT
+#include <sys/cdefs.h>
+#endif
+#define CONCAT __CONCAT
+
+#undef SYSCALL
+
+/* Kernel syscall interface:
+ Input:
+ v0 - system call number
+ a* - arguments, as in C
+ Output:
+ a3 - zero iff successful
+ v0 - errno value on failure, else result
+
+ This macro is similar to SYSCALL in asm.h, but not completely.
+ There's room for optimization, if we assume this will continue to
+ be assembled as one file.
+
+ This macro expansions does not include the return instruction.
+ If there's no other work to be done, use something like:
+ SYSCALL(foo) ; ret
+ If there is other work to do (in fork, maybe?), do it after the
+ SYSCALL invocation. */
+
+#define SYSCALL(x) \
+ .align 4 ;\
+ .globl CONCAT(machdep_sys_,x) ;\
+ .ent CONCAT(machdep_sys_,x), 0 ;\
+CONCAT(machdep_sys_,x): ;\
+ .frame sp,0,ra ;\
+ ldiq v0, CONCAT(SYS_,x) ;\
+ CHMK() ;\
+ beq a3, CONCAT(Lsys_noerr_,x) ;\
+ br gp, CONCAT(Lsys_err_,x) ;\
+CONCAT(Lsys_err_,x): ;\
+ /* Load gp so we can find cerror to jump to. */;\
+ ldgp gp, 0(gp) ;\
+ jmp zero, machdep_cerror ;\
+CONCAT(Lsys_noerr_,x):
+
+#define XSYSCALL(x) SYSCALL(x) ; RET ; .end CONCAT(machdep_sys_,x)
+
+ .globl machdep_cerror
+machdep_cerror:
+ br t0, Lmachdep_cerror_setgp
+Lmachdep_cerror_setgp:
+ ldgp gp, 0(t0)
+ stl v0, errno
+#if 0
+ ldiq v0, -1
+#else
+ subq zero, v0, v0
+#endif
+ RET
+
+/* The fork system call is special... */
+SYSCALL(fork)
+ cmovne a4, 0, v0
+ RET
+ .end machdep_sys_fork
+
+/* The pipe system call is special... */
+SYSCALL(pipe)
+ stl v0, 0(a0)
+ stl a4, 4(a0)
+ mov zero, v0
+ RET
+ .end machdep_sys_pipe
+
+/* The sigsuspend system call is special... */
+ .align 4
+ .globl machdep_sys_sigsuspend
+ .ent machdep_sys_sigsuspend, 0
+machdep_sys_sigsuspend:
+ ldl a0, 0(a0) /* pass *mask instead of mask */
+ ldiq v0, SYS_sigsuspend
+ CHMK()
+ mov zero, v0 /* shouldn't need; just in case... */
+ RET
+ .end machdep_sys_sigsuspend
+
+/* The sigprocmask system call is special... */
+ .align 4
+ .globl machdep_sys_sigprocmask
+ .ent machdep_sys_sigprocmask, 0
+machdep_sys_sigprocmask:
+ mov a2, a5 /* safe */
+ cmoveq a1, 1, a0 /* if set == NULL, how = SIG_BLOCK */
+ beq a1, Ldoit /* and set = 0, and do it. */
+ ldl a1, 0(a1) /* load the set from *set */
+Ldoit: ldiq v0, SYS_sigprocmask
+ CHMK()
+ beq a5, Lret /* if they don't want old mask, done */
+ stl v0, 0(a5) /* otherwise, give it to them. */
+Lret: mov zero, v0
+ RET
+ .end machdep_sys_sigprocmask
+
+/* More stuff ... */
+ .align 4
+ .global __machdep_save_int_state
+ .ent __machdep_save_int_state, 0
+__machdep_save_int_state:
+ .frame sp, 16, ra
+ ldgp gp, 0(t12)
+ lda sp, -16(sp)
+ stq ra, 0(sp)
+
+ /* save integer registers */
+ stq ra, ( 0 * 8)(a0) /* return address */
+ stq s0, ( 1 * 8)(a0) /* callee-saved registers */
+ stq s1, ( 2 * 8)(a0)
+ stq s2, ( 3 * 8)(a0)
+ stq s3, ( 4 * 8)(a0)
+ stq s4, ( 5 * 8)(a0)
+ stq s5, ( 6 * 8)(a0)
+ stq s6, ( 7 * 8)(a0)
+ stq sp, ( 9 * 8)(a0)
+ stq ra, ( 8 * 8)(a0) /* RA on return */
+ stq pv, (10 * 8)(a0) /* and PV; we restore it */
+
+ mov zero, v0
+ lda sp, 16(sp)
+ RET
+ .end __machdep_save_int_state
+
+ .align 4
+ .global __machdep_restore_int_state
+ .ent __machdep_restore_int_state, 0
+__machdep_restore_int_state:
+ .frame sp, 16, ra
+ ldgp gp, 0(t12)
+ lda sp, -16(sp)
+ stq ra, 0(sp)
+
+ /* restore integer registers */
+ ldq t0, ( 0 * 8)(a0) /* return address */
+ ldq s0, ( 1 * 8)(a0) /* callee-saved registers */
+ ldq s1, ( 2 * 8)(a0)
+ ldq s2, ( 3 * 8)(a0)
+ ldq s3, ( 4 * 8)(a0)
+ ldq s4, ( 5 * 8)(a0)
+ ldq s5, ( 6 * 8)(a0)
+ ldq s6, ( 7 * 8)(a0)
+ ldq ra, ( 8 * 8)(a0) /* RA after return */
+ ldq sp, ( 9 * 8)(a0)
+ ldq pv, (10 * 8)(a0) /* and PV; we restore it */
+
+ ldiq v0, 1
+ ret zero,(t0),1
+ .end __machdep_restore_int_state
+
+ .align 4
+ .global __machdep_save_fp_state
+ .ent __machdep_save_fp_state, 0
+__machdep_save_fp_state:
+ .frame sp, 16, ra
+ ldgp gp, 0(t12)
+ lda sp, -16(sp)
+ stq ra, 0(sp)
+
+ /* save FP registers */
+ stt fs0, (0 * 8)(a0) /* callee-saved registers */
+ stt fs1, (1 * 8)(a0)
+ stt fs2, (2 * 8)(a0)
+ stt fs3, (3 * 8)(a0)
+ stt fs4, (4 * 8)(a0)
+ stt fs5, (5 * 8)(a0)
+ stt fs6, (6 * 8)(a0)
+ stt fs7, (7 * 8)(a0)
+ mf_fpcr ft0 /* and FP control reg */
+ stt ft0, (8 * 8)(a0)
+
+ lda sp, 16(sp)
+ RET
+ .end __machdep_save_fp_state
+
+ .align 4
+ .global __machdep_restore_fp_state
+ .ent __machdep_restore_fp_state, 0
+__machdep_restore_fp_state:
+ .frame sp, 16, ra
+ ldgp gp, 0(t12)
+ lda sp, -16(sp)
+ stq ra, 0(sp)
+
+ /* restore FP registers */
+ ldt fs0, (0 * 8)(a0) /* callee-saved registers */
+ ldt fs1, (1 * 8)(a0)
+ ldt fs2, (2 * 8)(a0)
+ ldt fs3, (3 * 8)(a0)
+ ldt fs4, (4 * 8)(a0)
+ ldt fs5, (5 * 8)(a0)
+ ldt fs6, (6 * 8)(a0)
+ ldt fs7, (7 * 8)(a0)
+ ldt ft0, (8 * 8)(a0)
+ mt_fpcr ft0 /* and FP control reg */
+
+ lda sp, 16(sp)
+ RET
+ .end __machdep_restore_fp_state
+
+/* For fstat() we actually syscall fstat13. */
+ .align 4
+ .globl machdep_sys_fstat
+ .ent machdep_sys_fstat, 0
+machdep_sys_fstat:
+ .frame sp,0,ra
+ ldiq v0, SYS___fstat13
+ CHMK()
+ beq a3, Lsys_noerr_fstat
+ br gp, Lsys_err_fstat
+Lsys_err_fstat:
+ /* Load gp so we can find cerror to jump to. */
+ ldgp gp, 0(gp)
+ jmp zero, machdep_cerror
+Lsys_noerr_fstat:
+ RET
+ .end machdep_sys_fstat
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