From: Franck Bui-Huu <fbuihuu@gmail.com>
Date: Mon, 5 Feb 2007 14:24:26 +0000 (+0100)
Subject: [MIPS] signal32: no need to save c0_status register in setup_sigcontext32()
X-Git-Tag: v2.6.21-rc1~274^2~231^2~2
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6bfe96616062acb75c2460f01acc79236a8ba0e8;p=linux-2.6

[MIPS] signal32: no need to save c0_status register in setup_sigcontext32()

All the information in the MIPS c0_status register is priviledged.
Nothing that would constitute part of the thread context.

The one flag one could possibly argument about might be c0_status.fr
but none of the ABIs or tools or application software can make use
of it.

So for consistency with restore_sigcontext32(), which does not
restore c0_status register, this patch remove the saving part.

Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---

diff --git a/arch/mips/kernel/asm-offsets.c b/arch/mips/kernel/asm-offsets.c
index ea7df4b8da..c0b089d471 100644
--- a/arch/mips/kernel/asm-offsets.c
+++ b/arch/mips/kernel/asm-offsets.c
@@ -249,7 +249,6 @@ void output_sc_defines(void)
 	offset("#define SC_MDHI       ", struct sigcontext, sc_mdhi);
 	offset("#define SC_MDLO       ", struct sigcontext, sc_mdlo);
 	offset("#define SC_PC         ", struct sigcontext, sc_pc);
-	offset("#define SC_STATUS     ", struct sigcontext, sc_status);
 	offset("#define SC_FPC_CSR    ", struct sigcontext, sc_fpc_csr);
 	offset("#define SC_FPC_EIR    ", struct sigcontext, sc_fpc_eir);
 	offset("#define SC_HI1        ", struct sigcontext, sc_hi1);
diff --git a/arch/mips/kernel/signal32.c b/arch/mips/kernel/signal32.c
index 5d102efbdb..0994d6e1d6 100644
--- a/arch/mips/kernel/signal32.c
+++ b/arch/mips/kernel/signal32.c
@@ -170,7 +170,6 @@ static int setup_sigcontext32(struct pt_regs *regs,
 	int i;
 
 	err |= __put_user(regs->cp0_epc, &sc->sc_pc);
-	err |= __put_user(regs->cp0_status, &sc->sc_status);
 
 	err |= __put_user(0, &sc->sc_regs[0]);
 	for (i = 1; i < 32; i++)
diff --git a/include/asm-mips/sigcontext.h b/include/asm-mips/sigcontext.h
index cefa657dd0..3c175a7e43 100644
--- a/include/asm-mips/sigcontext.h
+++ b/include/asm-mips/sigcontext.h
@@ -19,7 +19,7 @@
  */
 struct sigcontext {
 	unsigned int		sc_regmask;	/* Unused */
-	unsigned int		sc_status;
+	unsigned int		sc_status;	/* Unused */
 	unsigned long long	sc_pc;
 	unsigned long long	sc_regs[32];
 	unsigned long long	sc_fpregs[32];
@@ -76,7 +76,7 @@ struct sigcontext {
 
 struct sigcontext32 {
 	__u32		sc_regmask;	/* Unused */
-	__u32		sc_status;
+	__u32		sc_status;	/* Unused */
 	__u64		sc_pc;
 	__u64		sc_regs[32];
 	__u64		sc_fpregs[32];