4.4-stable review patch. If anyone has any objections, please let me know.
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From: Aleksandar Markovic aleksandar.markovic@mips.com
commit 409fcace9963c1e8d2cb0f7ac62e8b34d47ef979 upstream.
Fix final phase of <CLASS|MADDF|MSUBF|MAX|MIN|MAXA|MINA>.<D|S> emulation. Provide proper generation of SIGFPE signal and updating debugfs FP exception stats in cases of any exception flags set in preceding phases of emulation.
CLASS.<D|S> instruction may generate "Unimplemented Operation" FP exception. <MADDF|MSUBF>.<D|S> instructions may generate "Inexact", "Unimplemented Operation", "Invalid Operation", "Overflow", and "Underflow" FP exceptions. <MAX|MIN|MAXA|MINA>.<D|S> instructions can generate "Unimplemented Operation" and "Invalid Operation" FP exceptions.
The proper final processing of the cases when any FP exception flag is set is achieved by replacing "break" statement with "goto copcsr" statement. With such solution, this patch brings the final phase of emulation of the above instructions consistent with the one corresponding to the previously implemented emulation of other related FPU instructions (ADD, SUB, etc.).
Fixes: 38db37ba069f ("MIPS: math-emu: Add support for the MIPS R6 CLASS FPU instruction") Fixes: e24c3bec3e8e ("MIPS: math-emu: Add support for the MIPS R6 MADDF FPU instruction") Fixes: 83d43305a1df ("MIPS: math-emu: Add support for the MIPS R6 MSUBF FPU instruction") Fixes: a79f5f9ba508 ("MIPS: math-emu: Add support for the MIPS R6 MAX{, A} FPU instruction") Fixes: 4e9561b20e2f ("MIPS: math-emu: Add support for the MIPS R6 MIN{, A} FPU instruction") Signed-off-by: Aleksandar Markovic aleksandar.markovic@mips.com Cc: Ralf Baechle ralf@linux-mips.org Cc: Douglas Leung douglas.leung@mips.com Cc: Goran Ferenc goran.ferenc@mips.com Cc: "Maciej W. Rozycki" macro@imgtec.com Cc: Miodrag Dinic miodrag.dinic@mips.com Cc: Paul Burton paul.burton@mips.com Cc: Petar Jovanovic petar.jovanovic@mips.com Cc: Raghu Gandham raghu.gandham@mips.com Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/17581/ Signed-off-by: James Hogan jhogan@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/mips/math-emu/cp1emu.c | 28 ++++++++++++++-------------- 1 file changed, 14 insertions(+), 14 deletions(-)
--- a/arch/mips/math-emu/cp1emu.c +++ b/arch/mips/math-emu/cp1emu.c @@ -1777,7 +1777,7 @@ static int fpu_emu(struct pt_regs *xcp, SPFROMREG(fs, MIPSInst_FS(ir)); SPFROMREG(fd, MIPSInst_FD(ir)); rv.s = ieee754sp_maddf(fd, fs, ft); - break; + goto copcsr; }
case fmsubf_op: { @@ -1790,7 +1790,7 @@ static int fpu_emu(struct pt_regs *xcp, SPFROMREG(fs, MIPSInst_FS(ir)); SPFROMREG(fd, MIPSInst_FD(ir)); rv.s = ieee754sp_msubf(fd, fs, ft); - break; + goto copcsr; }
case frint_op: { @@ -1814,7 +1814,7 @@ static int fpu_emu(struct pt_regs *xcp, SPFROMREG(fs, MIPSInst_FS(ir)); rv.w = ieee754sp_2008class(fs); rfmt = w_fmt; - break; + goto copcsr; }
case fmin_op: { @@ -1826,7 +1826,7 @@ static int fpu_emu(struct pt_regs *xcp, SPFROMREG(ft, MIPSInst_FT(ir)); SPFROMREG(fs, MIPSInst_FS(ir)); rv.s = ieee754sp_fmin(fs, ft); - break; + goto copcsr; }
case fmina_op: { @@ -1838,7 +1838,7 @@ static int fpu_emu(struct pt_regs *xcp, SPFROMREG(ft, MIPSInst_FT(ir)); SPFROMREG(fs, MIPSInst_FS(ir)); rv.s = ieee754sp_fmina(fs, ft); - break; + goto copcsr; }
case fmax_op: { @@ -1850,7 +1850,7 @@ static int fpu_emu(struct pt_regs *xcp, SPFROMREG(ft, MIPSInst_FT(ir)); SPFROMREG(fs, MIPSInst_FS(ir)); rv.s = ieee754sp_fmax(fs, ft); - break; + goto copcsr; }
case fmaxa_op: { @@ -1862,7 +1862,7 @@ static int fpu_emu(struct pt_regs *xcp, SPFROMREG(ft, MIPSInst_FT(ir)); SPFROMREG(fs, MIPSInst_FS(ir)); rv.s = ieee754sp_fmaxa(fs, ft); - break; + goto copcsr; }
case fabs_op: @@ -2095,7 +2095,7 @@ copcsr: DPFROMREG(fs, MIPSInst_FS(ir)); DPFROMREG(fd, MIPSInst_FD(ir)); rv.d = ieee754dp_maddf(fd, fs, ft); - break; + goto copcsr; }
case fmsubf_op: { @@ -2108,7 +2108,7 @@ copcsr: DPFROMREG(fs, MIPSInst_FS(ir)); DPFROMREG(fd, MIPSInst_FD(ir)); rv.d = ieee754dp_msubf(fd, fs, ft); - break; + goto copcsr; }
case frint_op: { @@ -2132,7 +2132,7 @@ copcsr: DPFROMREG(fs, MIPSInst_FS(ir)); rv.w = ieee754dp_2008class(fs); rfmt = w_fmt; - break; + goto copcsr; }
case fmin_op: { @@ -2144,7 +2144,7 @@ copcsr: DPFROMREG(ft, MIPSInst_FT(ir)); DPFROMREG(fs, MIPSInst_FS(ir)); rv.d = ieee754dp_fmin(fs, ft); - break; + goto copcsr; }
case fmina_op: { @@ -2156,7 +2156,7 @@ copcsr: DPFROMREG(ft, MIPSInst_FT(ir)); DPFROMREG(fs, MIPSInst_FS(ir)); rv.d = ieee754dp_fmina(fs, ft); - break; + goto copcsr; }
case fmax_op: { @@ -2168,7 +2168,7 @@ copcsr: DPFROMREG(ft, MIPSInst_FT(ir)); DPFROMREG(fs, MIPSInst_FS(ir)); rv.d = ieee754dp_fmax(fs, ft); - break; + goto copcsr; }
case fmaxa_op: { @@ -2180,7 +2180,7 @@ copcsr: DPFROMREG(ft, MIPSInst_FT(ir)); DPFROMREG(fs, MIPSInst_FS(ir)); rv.d = ieee754dp_fmaxa(fs, ft); - break; + goto copcsr; }
case fabs_op: