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From 2c8b6de913973274e877639658e9e7273a012adb Mon Sep 17 00:00:00 2001
From: "Dmitry V. Levin" <ldv@altlinux.org>
Date: Tue, 8 Jan 2019 19:23:44 +0000
Subject: [PATCH] mips o32: fix build
Commit 917c2ccf3a67 "Refactor stack pointers" moved mips_REG_* macros
from linux/mips/arch_regs.h to linux/mips/arch_regs.c because these
macros are no longer used outside syscall.c or files included by
syscall.c, but this caused a build regression on mips o32 because
decode_syscall_subcall() uses mips_REG_SP prior to its definition.
* syscall.c (decode_syscall_subcall): Move ...
* linux/mips/get_syscall_args.c: ... here.
* NEWS: Mention this fix.
Reported-by: Baruch Siach <baruch@tkos.co.il>
Fixes: v4.26~61 "Refactor stack pointers"
---
NEWS | 1 +
linux/mips/get_syscall_args.c | 26 ++++++++++++++++++++++++++
syscall.c | 27 ++-------------------------
3 files changed, 29 insertions(+), 25 deletions(-)
--- a/linux/mips/get_syscall_args.c
+++ b/linux/mips/get_syscall_args.c
@@ -37,3 +37,29 @@ arch_get_syscall_args(struct tcb *tcp)
#endif
return 1;
}
+
+#ifdef SYS_syscall_subcall
+static void
+decode_syscall_subcall(struct tcb *tcp)
+{
+ if (!scno_is_valid(tcp->u_arg[0]))
+ return;
+ tcp->scno = tcp->u_arg[0];
+ tcp->qual_flg = qual_flags(tcp->scno);
+ tcp->s_ent = &sysent[tcp->scno];
+ memmove(&tcp->u_arg[0], &tcp->u_arg[1],
+ sizeof(tcp->u_arg) - sizeof(tcp->u_arg[0]));
+ /*
+ * Fetching the last arg of 7-arg syscalls (fadvise64_64
+ * and sync_file_range) requires additional code,
+ * see linux/mips/get_syscall_args.c
+ */
+ if (tcp->s_ent->nargs == MAX_ARGS) {
+ if (umoven(tcp,
+ mips_REG_SP + MAX_ARGS * sizeof(tcp->u_arg[0]),
+ sizeof(tcp->u_arg[0]),
+ &tcp->u_arg[MAX_ARGS - 1]) < 0)
+ tcp->u_arg[MAX_ARGS - 1] = 0;
+ }
+}
+#endif /* SYS_syscall_subcall */
--- a/syscall.c
+++ b/syscall.c
@@ -349,31 +349,8 @@ decode_ipc_subcall(struct tcb *tcp)
#endif /* SYS_ipc_subcall */
#ifdef SYS_syscall_subcall
-static void
-decode_syscall_subcall(struct tcb *tcp)
-{
- if (!scno_is_valid(tcp->u_arg[0]))
- return;
- tcp->scno = tcp->u_arg[0];
- tcp->qual_flg = qual_flags(tcp->scno);
- tcp->s_ent = &sysent[tcp->scno];
- memmove(&tcp->u_arg[0], &tcp->u_arg[1],
- sizeof(tcp->u_arg) - sizeof(tcp->u_arg[0]));
-# ifdef LINUX_MIPSO32
- /*
- * Fetching the last arg of 7-arg syscalls (fadvise64_64
- * and sync_file_range) requires additional code,
- * see linux/mips/get_syscall_args.c
- */
- if (tcp->s_ent->nargs == MAX_ARGS) {
- if (umoven(tcp,
- mips_REG_SP + MAX_ARGS * sizeof(tcp->u_arg[0]),
- sizeof(tcp->u_arg[0]),
- &tcp->u_arg[MAX_ARGS - 1]) < 0)
- tcp->u_arg[MAX_ARGS - 1] = 0;
- }
-# endif /* LINUX_MIPSO32 */
-}
+/* The implementation is architecture specific. */
+static void decode_syscall_subcall(struct tcb *);
#endif /* SYS_syscall_subcall */
static void
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