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| author | Maciej W. Rozycki | 2015-04-04 00:27:48 +0200 |
|---|---|---|
| committer | Ralf Baechle | 2015-04-08 01:10:37 +0200 |
| commit | 9b26616c8d9dae53fbac7f7cb2c6dd1308102976 (patch) | |
| tree | d4249bd953d4fa955cecd1283cc0f518df83f8a2 /arch/mips/include/asm/elf.h | |
| parent | MIPS: math-emu: Make ABS.fmt and NEG.fmt arithmetic again (diff) | |
| download | kernel-qcow2-linux-9b26616c8d9dae53fbac7f7cb2c6dd1308102976.tar.gz kernel-qcow2-linux-9b26616c8d9dae53fbac7f7cb2c6dd1308102976.tar.xz kernel-qcow2-linux-9b26616c8d9dae53fbac7f7cb2c6dd1308102976.zip | |
MIPS: Respect the ISA level in FCSR handling
Define the central place the default FCSR value is set from, initialised
in `cpu_probe'. Determine the FCSR mask applied to values written to
the register with CTC1 in the full emulation mode and via ptrace(2),
according to the ISA level of processor hardware or the writability of
bits 31:18 if actual FPU hardware is used.
Software may rely on FCSR bits whose functions our emulator does not
implement, so it should not allow them to be set or software may get
confused. For ptrace(2) it's just sanity.
[ralf@linux-mips.org: Fixed double inclusion of <asm/current.h>.]
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9711/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/include/asm/elf.h')
| -rw-r--r-- | arch/mips/include/asm/elf.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/mips/include/asm/elf.h b/arch/mips/include/asm/elf.h index 535f196ffe02..612cf519bd88 100644 --- a/arch/mips/include/asm/elf.h +++ b/arch/mips/include/asm/elf.h @@ -11,6 +11,9 @@ #include <linux/fs.h> #include <uapi/linux/elf.h> +#include <asm/cpu-info.h> +#include <asm/current.h> + /* ELF header e_flags defines. */ /* MIPS architecture level. */ #define EF_MIPS_ARCH_1 0x00000000 /* -mips1 code. */ @@ -297,6 +300,8 @@ do { \ mips_set_personality_fp(state); \ \ current->thread.abi = &mips_abi; \ + \ + current->thread.fpu.fcr31 = current_cpu_data.fpu_csr31; \ } while (0) #endif /* CONFIG_32BIT */ @@ -356,6 +361,8 @@ do { \ else \ current->thread.abi = &mips_abi; \ \ + current->thread.fpu.fcr31 = current_cpu_data.fpu_csr31; \ + \ p = personality(current->personality); \ if (p != PER_LINUX32 && p != PER_LINUX) \ set_personality(PER_LINUX); \ |