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implement inline 5- and 6-argument syscalls for mipsn32 and mips64

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n32 and n64 ABIs add new argument registers vs o32, so that passing on
the stack is not necessary, so it's not clear why the 5- and
6-argument versions were special-cased to begin with; it seems to have
been pattern-copying from arch/mips (o32).

i've treated the new argument registers like the first 4 in terms of
clobber status (non-clobbered). hopefully this is correct.
This commit is contained in:
Rich Felker 2019-04-10 19:51:47 -04:00
parent d3b4869cd3
commit 1bcdaeee6e
2 changed files with 68 additions and 29 deletions
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66
arch/mips64/syscall_arch.h
View File

@ -1,9 +1,6 @@
#define __SYSCALL_LL_E(x) (x)
#define __SYSCALL_LL_O(x) (x)
__attribute__((visibility("hidden")))
long (__syscall)(long, ...);
#define SYSCALL_RLIM_INFINITY (-1UL/2)
#include <sys/stat.h>
@ -167,48 +164,71 @@ static inline long __syscall4(long n, long a, long b, long c, long d)
static inline long __syscall5(long n, long a, long b, long c, long d, long e)
{
long r2;
long old_b = b;
long old_c = c;
struct kernel_stat kst;
long ret;
register long r4 __asm__("$4") = a;
register long r5 __asm__("$5") = b;
register long r6 __asm__("$6") = c;
register long r7 __asm__("$7") = d;
register long r8 __asm__("$8") = e;
register long r2 __asm__("$2");
if (n == SYS_stat || n == SYS_fstat || n == SYS_lstat)
b = (long) &kst;
r5 = (long) &kst;
if (n == SYS_newfstatat)
c = (long) &kst;
r6 = (long) &kst;
r2 = (__syscall)(n, a, b, c, d, e);
if (r2 > -4096UL) return r2;
__asm__ __volatile__ (
"daddu $2,$0,%2 ; syscall"
: "=&r"(r2), "=r"(r7) : "ir"(n), "0"(r2), "1"(r7),
"r"(r4), "r"(r5), "r"(r6), "r"(r8)
: "$1", "$3", "$9", "$10", "$11", "$12", "$13",
"$14", "$15", "$24", "$25", "hi", "lo", "memory");
if (r7) return -r2;
ret = r2;
if (n == SYS_stat || n == SYS_fstat || n == SYS_lstat)
__stat_fix(&kst, (struct stat *)old_b);
__stat_fix(&kst, (struct stat *)b);
if (n == SYS_newfstatat)
__stat_fix(&kst, (struct stat *)old_c);
__stat_fix(&kst, (struct stat *)c);
return r2;
return ret;
}
static inline long __syscall6(long n, long a, long b, long c, long d, long e, long f)
{
long r2;
long old_b = b;
long old_c = c;
struct kernel_stat kst;
long ret;
register long r4 __asm__("$4") = a;
register long r5 __asm__("$5") = b;
register long r6 __asm__("$6") = c;
register long r7 __asm__("$7") = d;
register long r8 __asm__("$8") = e;
register long r9 __asm__("$9") = f;
register long r2 __asm__("$2");
if (n == SYS_stat || n == SYS_fstat || n == SYS_lstat)
b = (long) &kst;
r5 = (long) &kst;
if (n == SYS_newfstatat)
c = (long) &kst;
r6 = (long) &kst;
r2 = (__syscall)(n, a, b, c, d, e, f);
if (r2 > -4096UL) return r2;
__asm__ __volatile__ (
"daddu $2,$0,%2 ; syscall"
: "=&r"(r2), "=r"(r7) : "ir"(n), "0"(r2), "1"(r7),
"r"(r4), "r"(r5), "r"(r6), "r"(r8), "r"(r9)
: "$1", "$3", "$10", "$11", "$12", "$13",
"$14", "$15", "$24", "$25", "hi", "lo", "memory");
if (r7) return -r2;
ret = r2;
if (n == SYS_stat || n == SYS_fstat || n == SYS_lstat)
__stat_fix(&kst, (struct stat *)old_b);
__stat_fix(&kst, (struct stat *)b);
if (n == SYS_newfstatat)
__stat_fix(&kst, (struct stat *)old_c);
__stat_fix(&kst, (struct stat *)c);
return r2;
return ret;
}
#define VDSO_USEFUL

31
arch/mipsn32/syscall_arch.h
View File

@ -1,8 +1,6 @@
#define __SYSCALL_LL_E(x) (x)
#define __SYSCALL_LL_O(x) (x)
hidden long (__syscall)(long, ...);
#define SYSCALL_RLIM_INFINITY (-1UL/2)
#if _MIPSEL || __MIPSEL || __MIPSEL__
@ -102,8 +100,18 @@ static inline long __syscall4(long n, long a, long b, long c, long d)
static inline long __syscall5(long n, long a, long b, long c, long d, long e)
{
long r2 = (__syscall)(n, a, b, c, d, e);
if (r2 > -4096UL) return r2;
register long r4 __asm__("$4") = a;
register long r5 __asm__("$5") = b;
register long r6 __asm__("$6") = c;
register long r7 __asm__("$7") = d;
register long r8 __asm__("$8") = e;
register long r2 __asm__("$2");
__asm__ __volatile__ (
"addu $2,$0,%2 ; syscall"
: "=&r"(r2), "=r"(r7) : "ir"(n), "0"(r2), "1"(r7),
"r"(r4), "r"(r5), "r"(r6), "r"(r8)
: "$1", "$3", "$9", "$10", "$11", "$12", "$13",
"$14", "$15", "$24", "$25", "hi", "lo", "memory");
if (n == SYS_stat || n == SYS_fstat || n == SYS_lstat) __stat_fix(b);
if (n == SYS_newfstatat) __stat_fix(c);
return r2;
@ -111,8 +119,19 @@ static inline long __syscall5(long n, long a, long b, long c, long d, long e)
static inline long __syscall6(long n, long a, long b, long c, long d, long e, long f)
{
long r2 = (__syscall)(n, a, b, c, d, e, f);
if (r2 > -4096UL) return r2;
register long r4 __asm__("$4") = a;
register long r5 __asm__("$5") = b;
register long r6 __asm__("$6") = c;
register long r7 __asm__("$7") = d;
register long r8 __asm__("$8") = e;
register long r8 __asm__("$9") = f;
register long r2 __asm__("$2");
__asm__ __volatile__ (
"addu $2,$0,%2 ; syscall"
: "=&r"(r2), "=r"(r7) : "ir"(n), "0"(r2), "1"(r7),
"r"(r4), "r"(r5), "r"(r6), "r"(r8), "r"(r9)
: "$1", "$3", "$10", "$11", "$12", "$13",
"$14", "$15", "$24", "$25", "hi", "lo", "memory");
if (n == SYS_stat || n == SYS_fstat || n == SYS_lstat) __stat_fix(b);
if (n == SYS_newfstatat) __stat_fix(c);
return r2;