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MIPS: Avoid FP ELF checks when CONFIG_MIPS_FP_SUPPORT=n

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When CONFIG_MIPS_FP_SUPPORT=n we don't support floating point, so we can
avoid needless checks of ELF headers specifying the FP ABI or NaN
encoding to use. Deselect CONFIG_ARCH_BINFMT_ELF_STATE in this case to
avoid the need for our arch_elf_pt_proc() & arch_check_elf() functions,
and stub out the mips_set_personality_nan() & mips_set_personality_fp()
functions such that SET_PERSONALITY() doesn't need to worry about any of
this.

Signed-off-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/21011/
Cc: linux-mips@linux-mips.org
This commit is contained in:
Paul Burton 2018-11-07 23:14:09 +00:00
parent 4eec81d7d8
commit ea6a37373f
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GPG Key ID: 3EA79FACB57500DD
3 changed files with 27 additions and 5 deletions
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2
arch/mips/Kconfig
View File

@ -2,7 +2,7 @@
config MIPS
bool
default y
select ARCH_BINFMT_ELF_STATE
select ARCH_BINFMT_ELF_STATE if MIPS_FP_SUPPORT
select ARCH_CLOCKSOURCE_DATA
select ARCH_DISCARD_MEMBLOCK
select ARCH_HAS_ELF_RANDOMIZE

26
arch/mips/include/asm/elf.h
View File

@ -481,6 +481,8 @@ struct linux_binprm;
extern int arch_setup_additional_pages(struct linux_binprm *bprm,
int uses_interp);
#ifdef CONFIG_MIPS_FP_SUPPORT
struct arch_elf_state {
int nan_2008;
int fp_abi;
@ -497,19 +499,35 @@ struct arch_elf_state {
.overall_fp_mode = -1, \
}
/* Whether to accept legacy-NaN and 2008-NaN user binaries. */
extern bool mips_use_nan_legacy;
extern bool mips_use_nan_2008;
extern int arch_elf_pt_proc(void *ehdr, void *phdr, struct file *elf,
bool is_interp, struct arch_elf_state *state);
extern int arch_check_elf(void *ehdr, bool has_interpreter, void *interp_ehdr,
struct arch_elf_state *state);
/* Whether to accept legacy-NaN and 2008-NaN user binaries. */
extern bool mips_use_nan_legacy;
extern bool mips_use_nan_2008;
extern void mips_set_personality_nan(struct arch_elf_state *state);
extern void mips_set_personality_fp(struct arch_elf_state *state);
#else /* !CONFIG_MIPS_FP_SUPPORT */
struct arch_elf_state;
static inline void mips_set_personality_nan(struct arch_elf_state *state)
{
/* no-op */
}
static inline void mips_set_personality_fp(struct arch_elf_state *state)
{
/* no-op */
}
#endif /* !CONFIG_MIPS_FP_SUPPORT */
#define elf_read_implies_exec(ex, stk) mips_elf_read_implies_exec(&(ex), stk)
extern int mips_elf_read_implies_exec(void *elf_ex, int exstack);

4
arch/mips/kernel/elf.c
View File

@ -16,6 +16,8 @@
#include <asm/cpu-features.h>
#include <asm/cpu-info.h>
#ifdef CONFIG_MIPS_FP_SUPPORT
/* Whether to accept legacy-NaN and 2008-NaN user binaries. */
bool mips_use_nan_legacy;
bool mips_use_nan_2008;
@ -326,6 +328,8 @@ void mips_set_personality_nan(struct arch_elf_state *state)
}
}
#endif /* CONFIG_MIPS_FP_SUPPORT */
int mips_elf_read_implies_exec(void *elf_ex, int exstack)
{
if (exstack != EXSTACK_DISABLE_X) {