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| author | Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> | 2012-04-11 12:01:44 +0100 |
|---|---|---|
| committer | Anthony Liguori <aliguori@us.ibm.com> | 2012-04-11 12:30:01 -0500 |
| commit | 3e48dd4a2d48aabafe22ce3611d65544d0234a69 (patch) | |
| tree | 39ec6d5fcdea3a437c8b8ebf18c4d558980c5282 /hw/rtl8139.c | |
| parent | c1958aea51a14199d05d392edce932a956e1674d (diff) | |
| download | qemu-3e48dd4a2d48aabafe22ce3611d65544d0234a69.tar.gz | |
rtl8139: do not assume TxStatus[] and TxAddr[] are adjacent
Commit afe0a595356192d5f79703cf6462fcc112df007c ("rtl8139: support byte
read to TxStatus registers") reused rtl8139_TxStatus_read() for reading
TxAddr registers. It relies on the fact that TxStatus[] and TxAddr[]
are adjacent.
This causes a gcc warning because the compiler can detect that array
access is out-of-bounds:
hw/rtl8139.c:2501:27: error: array subscript is above array bounds [-Werror=array-bounds]
This patch refactors the function so that we don't rely on out-of-bounds
accesses.
Cc: Jason Wang <jasonwang@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'hw/rtl8139.c')
| -rw-r--r-- | hw/rtl8139.c | 26 |
1 files changed, 15 insertions, 11 deletions
diff --git a/hw/rtl8139.c b/hw/rtl8139.c index 4d553a8a59..4d0f5ba518 100644 --- a/hw/rtl8139.c +++ b/hw/rtl8139.c @@ -2482,15 +2482,17 @@ static void rtl8139_TxStatus_write(RTL8139State *s, uint32_t txRegOffset, uint32 rtl8139_transmit(s); } -static uint32_t rtl8139_TxStatus_read(RTL8139State *s, uint8_t addr, int size) +static uint32_t rtl8139_TxStatus_TxAddr_read(RTL8139State *s, uint32_t regs[], + uint32_t base, uint8_t addr, + int size) { - uint32_t reg = (addr - TxStatus0) / 4; + uint32_t reg = (addr - base) / 4; uint32_t offset = addr & 0x3; uint32_t ret = 0; if (addr & (size - 1)) { - DPRINTF("not implemented read for TxStatus addr=0x%x size=0x%x\n", addr, - size); + DPRINTF("not implemented read for TxStatus/TxAddr " + "addr=0x%x size=0x%x\n", addr, size); return ret; } @@ -2498,12 +2500,12 @@ static uint32_t rtl8139_TxStatus_read(RTL8139State *s, uint8_t addr, int size) case 1: /* fall through */ case 2: /* fall through */ case 4: - ret = (s->TxStatus[reg] >> offset * 8) & ((1 << (size * 8)) - 1); - DPRINTF("TxStatus[%d] read addr=0x%x size=0x%x val=0x%08x\n", reg, addr, - size, ret); + ret = (regs[reg] >> offset * 8) & ((1 << (size * 8)) - 1); + DPRINTF("TxStatus/TxAddr[%d] read addr=0x%x size=0x%x val=0x%08x\n", + reg, addr, size, ret); break; default: - DPRINTF("unsupported size 0x%x of TxStatus reading\n", size); + DPRINTF("unsupported size 0x%x of TxStatus/TxAddr reading\n", size); break; } @@ -2977,7 +2979,8 @@ static uint32_t rtl8139_io_readb(void *opaque, uint8_t addr) ret = s->mult[addr - MAR0]; break; case TxStatus0 ... TxStatus0+4*4-1: - ret = rtl8139_TxStatus_read(s, addr, 1); + ret = rtl8139_TxStatus_TxAddr_read(s, s->TxStatus, TxStatus0, + addr, 1); break; case ChipCmd: ret = rtl8139_ChipCmd_read(s); @@ -3043,7 +3046,7 @@ static uint32_t rtl8139_io_readw(void *opaque, uint8_t addr) switch (addr) { case TxAddr0 ... TxAddr0+4*4-1: - ret = rtl8139_TxStatus_read(s, addr, 2); + ret = rtl8139_TxStatus_TxAddr_read(s, s->TxAddr, TxAddr0, addr, 2); break; case IntrMask: ret = rtl8139_IntrMask_read(s); @@ -3135,7 +3138,8 @@ static uint32_t rtl8139_io_readl(void *opaque, uint8_t addr) break; case TxStatus0 ... TxStatus0+4*4-1: - ret = rtl8139_TxStatus_read(s, addr, 4); + ret = rtl8139_TxStatus_TxAddr_read(s, s->TxStatus, TxStatus0, + addr, 4); break; case TxAddr0 ... TxAddr0+4*4-1: |