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fix pread/pwrite syscall calling convention on sh

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despite sh not generally using register-pair alignment for 64-bit
syscall arguments, there are arch-specific versions of the syscall
entry points for pread and pwrite which include a dummy argument for
alignment before the 64-bit offset argument.
This commit is contained in:
Rich Felker 2016-08-11 18:36:46 -04:00
parent 39494a273e
commit 7cc3a28eed
4 changed files with 7 additions and 2 deletions
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1
arch/sh/syscall_arch.h
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@ -2,6 +2,7 @@
((union { long long ll; long l[2]; }){ .ll = x }).l[0], \
((union { long long ll; long l[2]; }){ .ll = x }).l[1]
#define __SYSCALL_LL_O(x) __SYSCALL_LL_E((x))
#define __SYSCALL_LL_PRW(x) 0, __SYSCALL_LL_E((x))
/* The extra OR instructions are to work around a hardware bug:
* http://documentation.renesas.com/doc/products/mpumcu/tu/tnsh7456ae.pdf

4
src/internal/syscall.h
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@ -12,6 +12,10 @@
#define SYSCALL_MMAP2_UNIT 4096ULL
#endif
#ifndef __SYSCALL_LL_PRW
#define __SYSCALL_LL_PRW(x) __SYSCALL_LL_O(x)
#endif
#ifndef __scc
#define __scc(X) ((long) (X))
typedef long syscall_arg_t;

2
src/unistd/pread.c
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@ -4,7 +4,7 @@
ssize_t pread(int fd, void *buf, size_t size, off_t ofs)
{
return syscall_cp(SYS_pread, fd, buf, size, __SYSCALL_LL_O(ofs));
return syscall_cp(SYS_pread, fd, buf, size, __SYSCALL_LL_PRW(ofs));
}
LFS64(pread);

2
src/unistd/pwrite.c
View File

@ -4,7 +4,7 @@
ssize_t pwrite(int fd, const void *buf, size_t size, off_t ofs)
{
return syscall_cp(SYS_pwrite, fd, buf, size, __SYSCALL_LL_O(ofs));
return syscall_cp(SYS_pwrite, fd, buf, size, __SYSCALL_LL_PRW(ofs));
}
LFS64(pwrite);