#define ELF_MACHINE_NAME "MIPS"
#include <assert.h>
+#include <entry.h>
+
+#ifndef ENTRY_POINT
+#error ENTRY_POINT needs to be defined for MIPS.
+#endif
+
+#ifndef _RTLD_PROLOGUE
+#ifdef __STDC__
+#define _RTLD_PROLOGUE(entry) "\n\t.globl " #entry \
+ "\n\t.ent " #entry \
+ "\n\t" #entry ":\n\t"
+#else
+#define _RTLD_PROLOGUE(entry) "\n\t.globl entry\n\t.ent entry\n\t entry:\n\t"
+#endif
+#endif
+
+#ifndef _RTLD_EPILOGUE
+#ifdef __STDC__
+#define _RTLD_EPILOGUE(entry) "\t.end " #entry "\n"
+#else
+#define _RTLD_EPILOGUE(entry) "\t.end entry\n"
+#endif
+#endif
+
+/* I have no idea what I am doing. */
+#define ELF_MACHINE_RELOC_NOPLT -1
+#define elf_machine_lookup_noplt_p(type) (1)
+#define elf_machine_lookup_noexec_p(type) (0)
/* Translate a processor specific dynamic tag to the index
in l_info array. */
#define ELF_MACHINE_ALIGN_MASK 0xffff
#endif
+/*
+ * MIPS libraries are usually linked to a non-zero base address. We
+ * subtrace the base address from the address where we map the object
+ * to. This results in more efficient address space usage.
+ */
+#if 0
+#define MAP_BASE_ADDR(l) ((l)->l_info[DT_MIPS(BASE_ADDRESS)] ? \
+ (l)->l_info[DT_MIPS(BASE_ADDRESS)]->d_un.d_ptr : 0)
+#else
+#define MAP_BASE_ADDR(l) 0x5ffe0000
+#endif
+
/* If there is a DT_MIPS_RLD_MAP entry in the dynamic section, fill it in
with the run-time address of the r_debug structure */
#define ELF_MACHINE_DEBUG_SETUP(l,r) \
} while (0)
/* Return nonzero iff E_MACHINE is compatible with the running host. */
-static inline int
+static inline int __attribute__ ((unused))
elf_machine_matches_host (ElfW(Half) e_machine)
{
switch (e_machine)
}
}
+/* Return the link-time address of _DYNAMIC. Conveniently, this is the
++ first element of the GOT. This must be inlined in a function which
++ uses global data. */
++static inline ElfW(Addr)
++elf_machine_dynamic (void)
++{
++ register ElfW(Addr) gp asm ("$28");
++ return * (ElfW(Addr) *) (gp - 0x7ff0);
++}
++
static inline ElfW(Addr) *
elf_mips_got_from_gpreg (ElfW(Addr) gpreg)
{
}
+/* Return the link-time address of _DYNAMIC. Conveniently, this is the
+ first element of the GOT. This must be inlined in a function which
+ uses global data. */
+static inline ElfW(Addr)
+elf_machine_dynamic (void)
+{
+ register ElfW(Addr) gp asm ("$28");
+ return * (ElfW(Addr) *) (gp - 0x7ff0);
+}
+
/* Return the run-time load address of the shared object. */
static inline ElfW(Addr)
elf_machine_load_address (void)
" nop\n"
"here: dsubu %0, $31, %0\n"
" .set reorder\n"
- : "=r" (addr));
+ : "=r" (addr)
+ : /* No inputs */
+ : "$31");
#else
asm (" .set noreorder\n"
" la %0, here\n"
" nop\n"
"here: subu %0, $31, %0\n"
" .set reorder\n"
- : "=r" (addr));
+ : "=r" (addr)
+ : /* No inputs */
+ : "$31");
#endif
return addr;
}
/* Relocate GOT. */
static inline void
-elf_machine_got_rel (struct link_map *map)
+elf_machine_got_rel (struct link_map *map, int lazy)
{
ElfW(Addr) *got;
ElfW(Sym) *sym;
const ElfW(Sym) *ref = sym; \
ElfW(Addr) sym_loadaddr; \
sym_loadaddr = _dl_lookup_symbol (strtab + sym->st_name, &ref, scope, \
- map->l_name, DL_LOOKUP_NOPLT); \
+ map->l_name, ELF_MACHINE_RELOC_NOPLT);\
(ref)? sym_loadaddr + ref->st_value: 0; \
})
{
if (ELFW(ST_TYPE) (sym->st_info) == STT_FUNC)
{
- if (sym->st_value /* && maybe_stub (sym->st_value) */)
+ if (sym->st_value && lazy)
*got = sym->st_value + map->l_addr;
else
*got = RESOLVE_GOTSYM (sym);
*got = RESOLVE_GOTSYM (sym);
else if (ELFW(ST_TYPE) (sym->st_info) == STT_FUNC
&& *got != sym->st_value
- /* && maybe_stub (*got) */)
+ && lazy)
*got += map->l_addr;
else if (ELFW(ST_TYPE) (sym->st_info) == STT_SECTION)
{
extern void _dl_runtime_resolve (ElfW(Word));
extern int _dl_mips_gnu_objects;
+#ifdef RTLD_BOOTSTRAP
+ {
+ return lazy;
+ }
+#endif
if (lazy)
{
/* The GOT entries for functions have not yet been filled in.
}
/* Relocate global offset table. */
- elf_machine_got_rel (l);
+ elf_machine_got_rel (l, lazy);
return lazy;
}
}
_dl_signal_error (0, NULL, "cannot find runtime link map");
+ return NULL;
}
/* Mips has no PLT but define elf_machine_relplt to be elf_machine_rel. */
to usual c arguments. */
#ifdef __mips64
-#define ELF_MACHINE_RUNTIME_TRAMPOLINE \
-/* The flag _dl_mips_gnu_objects is set if all dynamic objects are \
- generated by the gnu linker. */\
-int _dl_mips_gnu_objects = 1;\
-\
+#define ELF_MACHINE_RUNTIME_TRAMPOLINE \
+/* The flag _dl_mips_gnu_objects is set if all dynamic objects are \
+ generated by the gnu linker. */ \
+int _dl_mips_gnu_objects = 1; \
+ \
/* This is called from assembly stubs below which the compiler can't see. */ \
-static ElfW(Addr) \
-__dl_runtime_resolve (ElfW(Word), ElfW(Word), ElfW(Addr), ElfW(Addr)) \
- __attribute__ ((unused)); \
-\
-static ElfW(Addr) \
-__dl_runtime_resolve (ElfW(Word) sym_index,\
- ElfW(Word) return_address,\
- ElfW(Addr) old_gpreg,\
- ElfW(Addr) stub_pc)\
-{\
- struct link_map *l = elf_machine_runtime_link_map (old_gpreg, stub_pc);\
- const ElfW(Sym) *const symtab\
- = (const ElfW(Sym) *) (l->l_addr + l->l_info[DT_SYMTAB]->d_un.d_ptr);\
- const char *strtab\
- = (void *) (l->l_addr + l->l_info[DT_STRTAB]->d_un.d_ptr);\
- const ElfW(Addr) *got\
- = (const ElfW(Addr) *) (l->l_addr + l->l_info[DT_PLTGOT]->d_un.d_ptr);\
- const ElfW(Word) local_gotno\
- = (const ElfW(Word)) l->l_info[DT_MIPS (LOCAL_GOTNO)]->d_un.d_val;\
- const ElfW(Word) gotsym\
- = (const ElfW(Word)) l->l_info[DT_MIPS (GOTSYM)]->d_un.d_val;\
- const ElfW(Sym) *definer;\
- ElfW(Addr) loadbase;\
- ElfW(Addr) funcaddr;\
- struct link_map **scope;\
-\
- /* Look up the symbol's run-time value. */\
- scope = _dl_object_relocation_scope (l);\
- definer = &symtab[sym_index];\
-\
- loadbase = _dl_lookup_symbol (strtab + definer->st_name, &definer,\
- scope, l->l_name, DL_LOOKUP_NOPLT);\
-\
- *_dl_global_scope_end = NULL;\
-\
- /* Apply the relocation with that value. */\
- funcaddr = loadbase + definer->st_value;\
- *(got + local_gotno + sym_index - gotsym) = funcaddr;\
-\
- return funcaddr;\
-}\
-\
-asm ("\n\
- .text\n\
- .align 3\n\
- .globl _dl_runtime_resolve\n\
- .type _dl_runtime_resolve,@function\n\
- .ent _dl_runtime_resolve\n\
-_dl_runtime_resolve:\n\
- .set noreorder\n\
- # Save old GP to $3.\n\
- move $3,$28\n\
- # Modify t9 ($25) so as to point .cpload instruction.\n\
- daddu $25,2*8\n\
- # Compute GP.\n\
- .cpload $25\n\
- .set reorder\n\
- # Save slot call pc.\n\
- move $2, $31\n\
- # Save arguments and sp value in stack.\n\
- dsubu $29, 10*8\n\
- .cprestore 8*8\n\
- sd $15, 9*8($29)\n\
- sd $4, 3*8($29)\n\
- sd $5, 4*8($29)\n\
- sd $6, 5*8($29)\n\
- sd $7, 6*8($29)\n\
- sd $16, 7*8($29)\n\
- move $16, $29\n\
- move $4, $24\n\
- move $5, $15\n\
- move $6, $3\n\
- move $7, $2\n\
- jal __dl_runtime_resolve\n\
- move $29, $16\n\
- ld $31, 9*8($29)\n\
- ld $4, 3*8($29)\n\
- ld $5, 4*8($29)\n\
- ld $6, 5*8($29)\n\
- ld $7, 6*8($29)\n\
- ld $16, 7*8($29)\n\
- daddu $29, 10*8\n\
- move $25, $2\n\
- jr $25\n\
- .end _dl_runtime_resolve\n\
+static ElfW(Addr) \
+__dl_runtime_resolve (ElfW(Word), ElfW(Word), ElfW(Addr), ElfW(Addr)) \
+ __attribute__ ((unused)); \
+ \
+static ElfW(Addr) \
+__dl_runtime_resolve (ElfW(Word) sym_index, \
+ ElfW(Word) return_address, \
+ ElfW(Addr) old_gpreg, \
+ ElfW(Addr) stub_pc) \
+{ \
+ struct link_map *l = elf_machine_runtime_link_map (old_gpreg, stub_pc); \
+ const ElfW(Sym) *const symtab \
+ = (const ElfW(Sym) *) (l->l_addr + l->l_info[DT_SYMTAB]->d_un.d_ptr); \
+ const char *strtab \
+ = (void *) (l->l_addr + l->l_info[DT_STRTAB]->d_un.d_ptr); \
+ const ElfW(Addr) *got \
+ = (const ElfW(Addr) *) (l->l_addr + l->l_info[DT_PLTGOT]->d_un.d_ptr); \
+ const ElfW(Word) local_gotno \
+ = (const ElfW(Word)) l->l_info[DT_MIPS (LOCAL_GOTNO)]->d_un.d_val; \
+ const ElfW(Word) gotsym \
+ = (const ElfW(Word)) l->l_info[DT_MIPS (GOTSYM)]->d_un.d_val; \
+ const ElfW(Sym) *definer; \
+ ElfW(Addr) loadbase; \
+ ElfW(Addr) funcaddr; \
+ struct link_map **scope; \
+ \
+ /* Look up the symbol's run-time value. */ \
+ scope = _dl_object_relocation_scope (l); \
+ definer = &symtab[sym_index]; \
+ \
+ loadbase = _dl_lookup_symbol (strtab + definer->st_name, &definer, \
+ scope, l->l_name, ELF_MACHINE_RELOC_NOPLT); \
+ \
+ *_dl_global_scope_end = NULL; \
+ \
+ /* Apply the relocation with that value. */ \
+ funcaddr = loadbase + definer->st_value; \
+ *(got + local_gotno + sym_index - gotsym) = funcaddr; \
+ \
+ return funcaddr; \
+} \
+ \
+asm ("\n \
+ .text\n \
+ .align 3\n \
+ .globl _dl_runtime_resolve\n \
+ .type _dl_runtime_resolve,@function\n \
+ .ent _dl_runtime_resolve\n \
+_dl_runtime_resolve:\n \
+ .set noreorder\n \
+ # Save old GP to $3.\n \
+ move $3,$28\n \
+ # Modify t9 ($25) so as to point .cpload instruction.\n \
+ daddu $25,2*8\n \
+ # Compute GP.\n \
+ .cpload $25\n \
+ .set reorder\n \
+ # Save slot call pc.\n \
+ move $2, $31\n \
+ # Save arguments and sp value in stack.\n \
+ dsubu $29, 10*8\n \
+ .cprestore 8*8\n \
+ sd $15, 9*8($29)\n \
+ sd $4, 3*8($29)\n \
+ sd $5, 4*8($29)\n \
+ sd $6, 5*8($29)\n \
+ sd $7, 6*8($29)\n \
+ sd $16, 7*8($29)\n \
+ move $16, $29\n \
+ move $4, $24\n \
+ move $5, $15\n \
+ move $6, $3\n \
+ move $7, $2\n \
+ jal __dl_runtime_resolve\n \
+ move $29, $16\n \
+ ld $31, 9*8($29)\n \
+ ld $4, 3*8($29)\n \
+ ld $5, 4*8($29)\n \
+ ld $6, 5*8($29)\n \
+ ld $7, 6*8($29)\n \
+ ld $16, 7*8($29)\n \
+ daddu $29, 10*8\n \
+ move $25, $2\n \
+ jr $25\n \
+ .end _dl_runtime_resolve\n \
");
#else
-#define ELF_MACHINE_RUNTIME_TRAMPOLINE \
-/* The flag _dl_mips_gnu_objects is set if all dynamic objects are \
- generated by the gnu linker. */\
-int _dl_mips_gnu_objects = 1;\
-\
+#define ELF_MACHINE_RUNTIME_TRAMPOLINE \
+/* The flag _dl_mips_gnu_objects is set if all dynamic objects are \
+ generated by the gnu linker. */ \
+int _dl_mips_gnu_objects = 1; \
+ \
/* This is called from assembly stubs below which the compiler can't see. */ \
-static ElfW(Addr) \
-__dl_runtime_resolve (ElfW(Word), ElfW(Word), ElfW(Addr), ElfW(Addr)) \
- __attribute__ ((unused)); \
-\
-static ElfW(Addr) \
-__dl_runtime_resolve (ElfW(Word) sym_index,\
- ElfW(Word) return_address,\
- ElfW(Addr) old_gpreg,\
- ElfW(Addr) stub_pc)\
-{\
- struct link_map *l = elf_machine_runtime_link_map (old_gpreg, stub_pc);\
- const ElfW(Sym) *const symtab\
- = (const ElfW(Sym) *) (l->l_addr + l->l_info[DT_SYMTAB]->d_un.d_ptr);\
- const char *strtab\
- = (void *) (l->l_addr + l->l_info[DT_STRTAB]->d_un.d_ptr);\
- const ElfW(Addr) *got\
- = (const ElfW(Addr) *) (l->l_addr + l->l_info[DT_PLTGOT]->d_un.d_ptr);\
- const ElfW(Word) local_gotno\
- = (const ElfW(Word)) l->l_info[DT_MIPS (LOCAL_GOTNO)]->d_un.d_val;\
- const ElfW(Word) gotsym\
- = (const ElfW(Word)) l->l_info[DT_MIPS (GOTSYM)]->d_un.d_val;\
- const ElfW(Sym) *definer;\
- ElfW(Addr) loadbase;\
- ElfW(Addr) funcaddr;\
- struct link_map **scope;\
-\
- /* Look up the symbol's run-time value. */\
- scope = _dl_object_relocation_scope (l);\
- definer = &symtab[sym_index];\
-\
- loadbase = _dl_lookup_symbol (strtab + definer->st_name, &definer,\
- scope, l->l_name, DL_LOOKUP_NOPLT);\
-\
- *_dl_global_scope_end = NULL;\
-\
- /* Apply the relocation with that value. */\
- funcaddr = loadbase + definer->st_value;\
- *(got + local_gotno + sym_index - gotsym) = funcaddr;\
-\
- return funcaddr;\
-}\
-\
-asm ("\n\
- .text\n\
- .align 2\n\
- .globl _dl_runtime_resolve\n\
- .type _dl_runtime_resolve,@function\n\
- .ent _dl_runtime_resolve\n\
-_dl_runtime_resolve:\n\
- .set noreorder\n\
- # Save old GP to $3.\n\
- move $3,$28\n\
- # Modify t9 ($25) so as to point .cpload instruction.\n\
- addu $25,8\n\
- # Compute GP.\n\
- .cpload $25\n\
- .set reorder\n\
- # Save slot call pc.\n\
- move $2, $31\n\
- # Save arguments and sp value in stack.\n\
- subu $29, 40\n\
- .cprestore 32\n\
- sw $15, 36($29)\n\
- sw $4, 12($29)\n\
- sw $5, 16($29)\n\
- sw $6, 20($29)\n\
- sw $7, 24($29)\n\
- sw $16, 28($29)\n\
- move $16, $29\n\
- move $4, $24\n\
- move $5, $15\n\
- move $6, $3\n\
- move $7, $2\n\
- jal __dl_runtime_resolve\n\
- move $29, $16\n\
- lw $31, 36($29)\n\
- lw $4, 12($29)\n\
- lw $5, 16($29)\n\
- lw $6, 20($29)\n\
- lw $7, 24($29)\n\
- lw $16, 28($29)\n\
- addu $29, 40\n\
- move $25, $2\n\
- jr $25\n\
- .end _dl_runtime_resolve\n\
+static ElfW(Addr) \
+__dl_runtime_resolve (ElfW(Word), ElfW(Word), ElfW(Addr), ElfW(Addr)) \
+ __attribute__ ((unused)); \
+ \
+static ElfW(Addr) \
+__dl_runtime_resolve (ElfW(Word) sym_index, \
+ ElfW(Word) return_address, \
+ ElfW(Addr) old_gpreg, \
+ ElfW(Addr) stub_pc) \
+{ \
+ struct link_map *l = elf_machine_runtime_link_map (old_gpreg, stub_pc); \
+ const ElfW(Sym) *const symtab \
+ = (const ElfW(Sym) *) (l->l_addr + l->l_info[DT_SYMTAB]->d_un.d_ptr); \
+ const char *strtab \
+ = (void *) (l->l_addr + l->l_info[DT_STRTAB]->d_un.d_ptr); \
+ const ElfW(Addr) *got \
+ = (const ElfW(Addr) *) (l->l_addr + l->l_info[DT_PLTGOT]->d_un.d_ptr); \
+ const ElfW(Word) local_gotno \
+ = (const ElfW(Word)) l->l_info[DT_MIPS (LOCAL_GOTNO)]->d_un.d_val; \
+ const ElfW(Word) gotsym \
+ = (const ElfW(Word)) l->l_info[DT_MIPS (GOTSYM)]->d_un.d_val; \
+ const ElfW(Sym) *definer; \
+ ElfW(Addr) loadbase; \
+ ElfW(Addr) funcaddr; \
+ struct link_map **scope; \
+ \
+ /* Look up the symbol's run-time value. */ \
+ scope = _dl_object_relocation_scope (l); \
+ definer = &symtab[sym_index]; \
+ \
+ loadbase = _dl_lookup_symbol (strtab + definer->st_name, &definer, \
+ scope, l->l_name, ELF_MACHINE_RELOC_NOPLT); \
+ \
+ *_dl_global_scope_end = NULL; \
+ \
+ /* Apply the relocation with that value. */ \
+ funcaddr = loadbase + definer->st_value; \
+ *(got + local_gotno + sym_index - gotsym) = funcaddr; \
+ \
+ return funcaddr; \
+} \
+ \
+asm ("\n \
+ .text\n \
+ .align 2\n \
+ .globl _dl_runtime_resolve\n \
+ .type _dl_runtime_resolve,@function\n \
+ .ent _dl_runtime_resolve\n \
+_dl_runtime_resolve:\n \
+ .set noreorder\n \
+ # Save slot call pc.\n \
+ move $3, $31\n \
+ # Modify t9 ($25) so as to point .cpload instruction.\n \
+ addu $25,8\n \
+ # Compute GP.\n \
+ .cpload $25\n \
+ .set reorder\n \
+ # Save slot call pc.\n \
+ move $2, $31\n \
+ # Save arguments and sp value in stack.\n \
+ subu $29, 40\n \
+ .cprestore 32\n \
+ sw $15, 36($29)\n \
+ sw $4, 12($29)\n \
+ sw $5, 16($29)\n \
+ sw $6, 20($29)\n \
+ sw $7, 24($29)\n \
+ sw $16, 28($29)\n \
+ move $16, $29\n \
+ move $4, $24\n \
+ move $5, $15\n \
+ move $6, $3\n \
+ move $7, $2\n \
+ jal __dl_runtime_resolve\n \
+ move $29, $16\n \
+ lw $31, 36($29)\n \
+ lw $4, 12($29)\n \
+ lw $5, 16($29)\n \
+ lw $6, 20($29)\n \
+ lw $7, 24($29)\n \
+ lw $16, 28($29)\n \
+ addu $29, 40\n \
+ move $25, $2\n \
+ jr $25\n \
+ .end _dl_runtime_resolve\n \
");
#endif
/* Mask identifying addresses reserved for the user program,
where the dynamic linker should not map anything. */
-#define ELF_MACHINE_USER_ADDRESS_MASK 0x00000000UL
+#define ELF_MACHINE_USER_ADDRESS_MASK 0x80000000UL
/* Initial entry point code for the dynamic linker.
The C function `_dl_start' is the real entry point;
- its return value is the user program's entry point. */
+ its return value is the user program's entry point.
+ Note how we have to be careful about two things:
+
+ 1) That we allocate a minimal stack of 24 bytes for
+ every function call, the MIPS ABI states that even
+ if all arguments are passed in registers the procedure
+ called can use the 16 byte area pointed to by $sp
+ when it is called to store away the arguments passed
+ to it.
+
+ 2) That under Linux the entry is named __start
+ and not just plain _start. */
#ifdef __mips64
#define RTLD_START asm ("\
.text\n\
- .align 3\n\
- .globl _start\n\
- .globl _dl_start_user\n\
- .ent _start\n\
-_start:\n\
+ .align 3\n"\
+_RTLD_PROLOGUE (ENTRY_POINT)\
+" .globl _dl_start_user\n\
.set noreorder\n\
bltzal $0, 0f\n\
nop\n\
ld $5, 1*8($29)\n\
ld $6, 2*8$29)\n\
ld $7, 3*8($29)\n\
- jr $25\n\
- .end _start\n\
-");
+ jr $25\n"\
+_RTLD_EPILOGUE(ENTRY_POINT) \
+);
+
#else
#define RTLD_START asm ("\
- .text\n\
- .globl _start\n\
- .globl _dl_start_user\n\
- .ent _start\n\
-_start:\n\
+ .text\n"\
+_RTLD_PROLOGUE(ENTRY_POINT)\
+" .globl _dl_start_user\n\
.set noreorder\n\
bltzal $0, 0f\n\
nop\n\
la $4, _DYNAMIC\n\
sw $4, -0x7ff0($28)\n\
move $4, $29\n\
+ subu $29, 16\n\
jal _dl_start\n\
+ addiu $29, 16\n\
# Get the value of label '_dl_start_user' in t9 ($25).\n\
la $25, _dl_start_user\n\
_dl_start_user:\n\
lw $4, 8($2)\n\
# Call _dl_init_next to return the address of an initializer\n\
# function to run.\n\
+ subu $29, 16\n\
jal _dl_init_next\n\
+ addiu $29, 16\n\
move $28, $16\n\
# Check for zero return, when out of initializers.\n\
beq $2, $0, 2f\n\
move $28, $16\n\
# Loop to call _dl_init_next for the next initializer.\n\
b 1b\n\
+2: # Clear the startup flag. Assumes 32 bit ints.\n\
+ sw $0, _dl_starting_up\n\
# Pass our finalizer function to the user in ra.\n\
-2: la $31, _dl_fini\n\
+ la $31, _dl_fini\n\
# Jump to the user entry point.\n\
move $25, $17\n\
lw $4, 0($29)\n\
lw $5, 4($29)\n\
lw $6, 8($29)\n\
lw $7, 12($29)\n\
- jr $25\n\
- .end _start\n\
+ jr $25\n"\
+_RTLD_EPILOGUE(ENTRY_POINT)\
");
#endif
/* FPU control word bits. Mips version.
Copyright (C) 1996, 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
- Contributed by Olaf Flebbe.
+ Contributed by Olaf Flebbe and Ralf Baechle.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
#ifndef _FPU_CONTROL_H
#define _FPU_CONTROL_H
-/* FP control/status register bit assignments.
+/* MIPS FPU floating point control register bits.
*
- * 31-25 24 23 22-18 17-12 11-7 6-2 1-0
- * (cause) (enables) (flags)
- * | reserved | FS | C | reserved | E V Z O U I | V Z O U I | V Z O U I | RM
+ * 31-25 -> floating point conditions code bits 7-1. These bits are only
+ * available in MIPS IV.
+ * 24 -> flush denormalized results to zero instead of
+ * causing unimplemented operation exception. This bit is only
+ * available for MIPS III and newer.
+ * 23 -> Condition bit
+ * 22-18 -> reserved (read as 0, write with 0)
+ * 17 -> cause bit for unimplemented operation
+ * 16 -> cause bit for invalid exception
+ * 15 -> cause bit for division by zero exception
+ * 14 -> cause bit for overflow exception
+ * 13 -> cause bit for underflow exception
+ * 12 -> cause bit for inexact exception
+ * 11 -> enable exception for invalid exception
+ * 10 -> enable exception for division by zero exception
+ * 9 -> enable exception for overflow exception
+ * 8 -> enable exception for underflow exception
+ * 7 -> enable exception for inexact exception
+ * 6 -> flag invalid exception
+ * 5 -> flag division by zero exception
+ * 4 -> flag overflow exception
+ * 3 -> flag underflow exception
+ * 2 -> flag inexact exception
+ * 1-0 -> rounding control
*
- * FS: When set, denormalized results are flushed to zero instead of
- * causing an unimplemented operation exception.
- * C: Condition bit.
- * E: Unimplemented Operation.
- * V: Invalid Operation.
- * Z: Division by zero.
- * O: Overflow.
- * U: Underflow.
- * I: Inexact Operation
- * RM: Rounding mode bits
- * 00 (RN) - rounding to nearest
- * 01 (RZ) - rounding toward zero
- * 10 (RP) - rounding down (toward - infinity)
- * 11 (RM) - rounding up (toward + infinity)
*
+ * Rounding Control:
+ * 00 - rounding to nearest (RN)
+ * 01 - rounding toward zero (RZ)
+ * 01 - rounding (up) toward plus infinity (RP)
+ * 11 - rounding (down)toward minus infinity (RM)
*/
#include <features.h>
/* masking of interrupts */
-#define _FPU_MASK_IM (1 << 11)
-#define _FPU_MASK_DM (1 << 24) /* XXX */
-#define _FPU_MASK_ZM (1 << 10)
-#define _FPU_MASK_OM (1 << 9)
-#define _FPU_MASK_UM (1 << 8)
-#define _FPU_MASK_PM (1 << 7)
-
-/* precision control */
-#define _FPU_EXTENDED 0
-#define _FPU_DOUBLE 0
-#define _FPU_SINGLE 0
+#define _FPU_MASK_V 0x0800 /* Invalid operation */
+#define _FPU_MASK_Z 0x0400 /* Division by zero */
+#define _FPU_MASK_O 0x0200 /* Overflow */
+#define _FPU_MASK_U 0x0100 /* Underflow */
+#define _FPU_MASK_I 0x0080 /* Inexact operation */
+
+/* flush denormalized numbers to zero */
+#define _FPU_FLUSH_TZ 0x1000000
/* rounding control */
-#define _FPU_RC_NEAREST 0x0 /* RECOMMENDED */
-#define _FPU_RC_DOWN 0x2
-#define _FPU_RC_UP 0x3
+#define _FPU_RC_NEAREST 0x0 /* RECOMMENDED */
#define _FPU_RC_ZERO 0x1
+#define _FPU_RC_UP 0x2
+#define _FPU_RC_DOWN 0x3
-#define _FPU_RESERVED 0xfe7c0000 /* Reserved bits */
+#define _FPU_RESERVED 0xfe3c0000 /* Reserved bits in cw */
/* The fdlibm code requires strict IEEE double precision arithmetic,
and no interrupts for exceptions, rounding to nearest. */
-#define _FPU_DEFAULT 0x0
+#define _FPU_DEFAULT 0x00000600
/* IEEE: same as above, but exceptions */
-#define _FPU_IEEE (0x1f << 7)
+#define _FPU_IEEE 0x00000F80
/* Type of the control word. */
-typedef unsigned int fpu_control_t;
+typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__HI__)));
/* Macros for accessing the hardware control word. */
-#define _FPU_GETCW(cw) __asm__ ("cfc1 %0, $31; nop; nop" : "=r" (cw))
-#define _FPU_SETCW(cw) __asm__ ("ctc1 %0, $31; nop; nop" : : "r" (cw))
+#define _FPU_GETCW(cw) __asm__ ("cfc1 %0,$31" : "=r" (cw) : )
+#define _FPU_SETCW(cw) __asm__ ("ctc1 %0,$31" : : "r" (cw))
/* Default control word set at startup. */
extern fpu_control_t __fpu_control;
__BEGIN_DECLS
-/* Called at startup. It can be used to manipulate fpu control register. */
+/* Called at startup. It can be used to manipulate the fpu control
+ register. */
extern void __setfpucw __P ((fpu_control_t));
__END_DECLS
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