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linux-user: Move lock_user et al out of line

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These functions are not small, except for unlock_user
without debugging enabled.  Move them out of line, and
add missing braces on the way.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20210212184902.1251044-18-richard.henderson@linaro.org
[PMM: fixed the sense of an ifdef test in qemu.h]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2021-02-12 10:48:48 -08:00 committed by Peter Maydell
parent c7169b022b
commit 687ca79789
2 changed files with 53 additions and 40 deletions
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47
linux-user/qemu.h
View File

@ -640,57 +640,24 @@ abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len);
/* Lock an area of guest memory into the host. If copy is true then the
host area will have the same contents as the guest. */
static inline void *lock_user(int type, abi_ulong guest_addr, long len, int copy)
{
if (!access_ok_untagged(type, guest_addr, len)) {
return NULL;
}
#ifdef DEBUG_REMAP
{
void *addr;
addr = g_malloc(len);
if (copy)
memcpy(addr, g2h(guest_addr), len);
else
memset(addr, 0, len);
return addr;
}
#else
return g2h_untagged(guest_addr);
#endif
}
void *lock_user(int type, abi_ulong guest_addr, long len, int copy);
/* Unlock an area of guest memory. The first LEN bytes must be
flushed back to guest memory. host_ptr = NULL is explicitly
allowed and does nothing. */
static inline void unlock_user(void *host_ptr, abi_ulong guest_addr,
long len)
{
#ifdef DEBUG_REMAP
if (!host_ptr)
return;
if (host_ptr == g2h_untagged(guest_addr))
return;
if (len > 0)
memcpy(g2h_untagged(guest_addr), host_ptr, len);
g_free(host_ptr);
#ifndef DEBUG_REMAP
static inline void unlock_user(void *host_ptr, abi_ulong guest_addr, long len)
{ }
#else
void unlock_user(void *host_ptr, abi_ulong guest_addr, long len);
#endif
}
/* Return the length of a string in target memory or -TARGET_EFAULT if
access error. */
abi_long target_strlen(abi_ulong gaddr);
/* Like lock_user but for null terminated strings. */
static inline void *lock_user_string(abi_ulong guest_addr)
{
abi_long len;
len = target_strlen(guest_addr);
if (len < 0)
return NULL;
return lock_user(VERIFY_READ, guest_addr, (long)(len + 1), 1);
}
void *lock_user_string(abi_ulong guest_addr);
/* Helper macros for locking/unlocking a target struct. */
#define lock_user_struct(type, host_ptr, guest_addr, copy) \

46
linux-user/uaccess.c
View File

@ -4,6 +4,52 @@
#include "qemu.h"
void *lock_user(int type, abi_ulong guest_addr, long len, int copy)
{
if (!access_ok_untagged(type, guest_addr, len)) {
return NULL;
}
#ifdef DEBUG_REMAP
{
void *addr;
addr = g_malloc(len);
if (copy) {
memcpy(addr, g2h(guest_addr), len);
} else {
memset(addr, 0, len);
}
return addr;
}
#else
return g2h_untagged(guest_addr);
#endif
}
#ifdef DEBUG_REMAP
void unlock_user(void *host_ptr, abi_ulong guest_addr, long len);
{
if (!host_ptr) {
return;
}
if (host_ptr == g2h_untagged(guest_addr)) {
return;
}
if (len > 0) {
memcpy(g2h_untagged(guest_addr), host_ptr, len);
}
g_free(host_ptr);
}
#endif
void *lock_user_string(abi_ulong guest_addr)
{
abi_long len = target_strlen(guest_addr);
if (len < 0) {
return NULL;
}
return lock_user(VERIFY_READ, guest_addr, (long)(len + 1), 1);
}
/* copy_from_user() and copy_to_user() are usually used to copy data
* buffers between the target and host. These internally perform
* locking/unlocking of the memory.