mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-14 16:46:51 +07:00
597ce1723e
CPUs implementing MIPS32 R2 may include a 64-bit FPU, just as MIPS64 CPUs do. In order to preserve backwards compatibility a 64-bit FPU will act like a 32-bit FPU (by accessing doubles from the least significant 32 bits of an even-odd pair of FP registers) when the Status.FR bit is zero, again just like a mips64 CPU. The standard O32 ABI is defined expecting a 32-bit FPU, however recent toolchains support use of a 64-bit FPU from an O32 MIPS32 executable. When an ELF executable is built to use a 64-bit FPU a new flag (EF_MIPS_FP64) is set in the ELF header. With this patch the kernel will check the EF_MIPS_FP64 flag when executing an O32 binary, and set Status.FR accordingly. The addition of O32 64-bit FP support lessens the opportunity for optimisation in the FPU emulator, so a CONFIG_MIPS_O32_FP64_SUPPORT Kconfig option is introduced to allow this support to be disabled for those that don't require it. Inspired by an earlier patch by Leonid Yegoshin, but implemented more cleanly & correctly. Signed-off-by: Paul Burton <paul.burton@imgtec.com> Cc: linux-mips@linux-mips.org Cc: Paul Burton <paul.burton@imgtec.com> Patchwork: https://patchwork.linux-mips.org/patch/6154/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
191 lines
5.2 KiB
C
191 lines
5.2 KiB
C
/*
|
|
* Support for o32 Linux/MIPS ELF binaries.
|
|
*
|
|
* Copyright (C) 1999, 2001 Ralf Baechle
|
|
* Copyright (C) 1999, 2001 Silicon Graphics, Inc.
|
|
*
|
|
* Heavily inspired by the 32-bit Sparc compat code which is
|
|
* Copyright (C) 1995, 1996, 1997, 1998 David S. Miller (davem@redhat.com)
|
|
* Copyright (C) 1995, 1996, 1997, 1998 Jakub Jelinek (jj@ultra.linux.cz)
|
|
*/
|
|
|
|
#define ELF_ARCH EM_MIPS
|
|
#define ELF_CLASS ELFCLASS32
|
|
#ifdef __MIPSEB__
|
|
#define ELF_DATA ELFDATA2MSB;
|
|
#else /* __MIPSEL__ */
|
|
#define ELF_DATA ELFDATA2LSB;
|
|
#endif
|
|
|
|
/* ELF register definitions */
|
|
#define ELF_NGREG 45
|
|
#define ELF_NFPREG 33
|
|
|
|
typedef unsigned int elf_greg_t;
|
|
typedef elf_greg_t elf_gregset_t[ELF_NGREG];
|
|
|
|
typedef double elf_fpreg_t;
|
|
typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
|
|
|
|
/*
|
|
* In order to be sure that we don't attempt to execute an O32 binary which
|
|
* requires 64 bit FP (FR=1) on a system which does not support it we refuse
|
|
* to execute any binary which has bits specified by the following macro set
|
|
* in its ELF header flags.
|
|
*/
|
|
#ifdef CONFIG_MIPS_O32_FP64_SUPPORT
|
|
# define __MIPS_O32_FP64_MUST_BE_ZERO 0
|
|
#else
|
|
# define __MIPS_O32_FP64_MUST_BE_ZERO EF_MIPS_FP64
|
|
#endif
|
|
|
|
/*
|
|
* This is used to ensure we don't load something for the wrong architecture.
|
|
*/
|
|
#define elf_check_arch(hdr) \
|
|
({ \
|
|
int __res = 1; \
|
|
struct elfhdr *__h = (hdr); \
|
|
\
|
|
if (__h->e_machine != EM_MIPS) \
|
|
__res = 0; \
|
|
if (__h->e_ident[EI_CLASS] != ELFCLASS32) \
|
|
__res = 0; \
|
|
if ((__h->e_flags & EF_MIPS_ABI2) != 0) \
|
|
__res = 0; \
|
|
if (((__h->e_flags & EF_MIPS_ABI) != 0) && \
|
|
((__h->e_flags & EF_MIPS_ABI) != EF_MIPS_ABI_O32)) \
|
|
__res = 0; \
|
|
if (__h->e_flags & __MIPS_O32_FP64_MUST_BE_ZERO) \
|
|
__res = 0; \
|
|
\
|
|
__res; \
|
|
})
|
|
|
|
#ifdef CONFIG_KVM_GUEST
|
|
#define TASK32_SIZE 0x3fff8000UL
|
|
#else
|
|
#define TASK32_SIZE 0x7fff8000UL
|
|
#endif
|
|
#undef ELF_ET_DYN_BASE
|
|
#define ELF_ET_DYN_BASE (TASK32_SIZE / 3 * 2)
|
|
|
|
#include <asm/processor.h>
|
|
|
|
/*
|
|
* When this file is selected, we are definitely running a 64bit kernel.
|
|
* So using the right regs define in asm/reg.h
|
|
*/
|
|
#define WANT_COMPAT_REG_H
|
|
|
|
/* These MUST be defined before elf.h gets included */
|
|
extern void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs);
|
|
#define ELF_CORE_COPY_REGS(_dest, _regs) elf32_core_copy_regs(_dest, _regs);
|
|
#define ELF_CORE_COPY_TASK_REGS(_tsk, _dest) \
|
|
({ \
|
|
int __res = 1; \
|
|
elf32_core_copy_regs(*(_dest), task_pt_regs(_tsk)); \
|
|
__res; \
|
|
})
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/elfcore.h>
|
|
#include <linux/compat.h>
|
|
#include <linux/math64.h>
|
|
|
|
#define elf_prstatus elf_prstatus32
|
|
struct elf_prstatus32
|
|
{
|
|
struct elf_siginfo pr_info; /* Info associated with signal */
|
|
short pr_cursig; /* Current signal */
|
|
unsigned int pr_sigpend; /* Set of pending signals */
|
|
unsigned int pr_sighold; /* Set of held signals */
|
|
pid_t pr_pid;
|
|
pid_t pr_ppid;
|
|
pid_t pr_pgrp;
|
|
pid_t pr_sid;
|
|
struct compat_timeval pr_utime; /* User time */
|
|
struct compat_timeval pr_stime; /* System time */
|
|
struct compat_timeval pr_cutime;/* Cumulative user time */
|
|
struct compat_timeval pr_cstime;/* Cumulative system time */
|
|
elf_gregset_t pr_reg; /* GP registers */
|
|
int pr_fpvalid; /* True if math co-processor being used. */
|
|
};
|
|
|
|
#define elf_prpsinfo elf_prpsinfo32
|
|
struct elf_prpsinfo32
|
|
{
|
|
char pr_state; /* numeric process state */
|
|
char pr_sname; /* char for pr_state */
|
|
char pr_zomb; /* zombie */
|
|
char pr_nice; /* nice val */
|
|
unsigned int pr_flag; /* flags */
|
|
__kernel_uid_t pr_uid;
|
|
__kernel_gid_t pr_gid;
|
|
pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid;
|
|
/* Lots missing */
|
|
char pr_fname[16]; /* filename of executable */
|
|
char pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
|
|
};
|
|
|
|
#define elf_caddr_t u32
|
|
#define init_elf_binfmt init_elf32_binfmt
|
|
|
|
#define jiffies_to_timeval jiffies_to_compat_timeval
|
|
static inline void
|
|
jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
|
|
{
|
|
/*
|
|
* Convert jiffies to nanoseconds and separate with
|
|
* one divide.
|
|
*/
|
|
u64 nsec = (u64)jiffies * TICK_NSEC;
|
|
u32 rem;
|
|
value->tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
|
|
value->tv_usec = rem / NSEC_PER_USEC;
|
|
}
|
|
|
|
void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < EF_R0; i++)
|
|
grp[i] = 0;
|
|
grp[EF_R0] = 0;
|
|
for (i = 1; i <= 31; i++)
|
|
grp[EF_R0 + i] = (elf_greg_t) regs->regs[i];
|
|
grp[EF_R26] = 0;
|
|
grp[EF_R27] = 0;
|
|
grp[EF_LO] = (elf_greg_t) regs->lo;
|
|
grp[EF_HI] = (elf_greg_t) regs->hi;
|
|
grp[EF_CP0_EPC] = (elf_greg_t) regs->cp0_epc;
|
|
grp[EF_CP0_BADVADDR] = (elf_greg_t) regs->cp0_badvaddr;
|
|
grp[EF_CP0_STATUS] = (elf_greg_t) regs->cp0_status;
|
|
grp[EF_CP0_CAUSE] = (elf_greg_t) regs->cp0_cause;
|
|
#ifdef EF_UNUSED0
|
|
grp[EF_UNUSED0] = 0;
|
|
#endif
|
|
}
|
|
|
|
MODULE_DESCRIPTION("Binary format loader for compatibility with o32 Linux/MIPS binaries");
|
|
MODULE_AUTHOR("Ralf Baechle (ralf@linux-mips.org)");
|
|
|
|
#undef MODULE_DESCRIPTION
|
|
#undef MODULE_AUTHOR
|
|
|
|
#undef TASK_SIZE
|
|
#define TASK_SIZE TASK_SIZE32
|
|
|
|
#undef cputime_to_timeval
|
|
#define cputime_to_timeval cputime_to_compat_timeval
|
|
static __inline__ void
|
|
cputime_to_compat_timeval(const cputime_t cputime, struct compat_timeval *value)
|
|
{
|
|
unsigned long jiffies = cputime_to_jiffies(cputime);
|
|
|
|
value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
|
|
value->tv_sec = jiffies / HZ;
|
|
}
|
|
|
|
#include "../../../fs/binfmt_elf.c"
|