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nic/zynq: fix packed conversion error with gcc 10

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Fixes #4142
This commit is contained in:
Martin Stein 2021-05-07 13:54:41 +02:00 committed by Christian Helmuth
parent 384a8da50b
commit d2bf565503
1 changed files with 22 additions and 8 deletions
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30
repos/os/src/drivers/nic/spec/zynq/cadence_gem.h
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@ -343,6 +343,20 @@ namespace Genode
struct Counter : Bitfield<0, 16> { };
};
/**
* These two structs help avoiding the following compile errors in
* places where the driver has to convert MAC addresses pointers
* to integer pointers:
*
* error: taking address of packed member of ‘Net::Mac_address’
* may result in an unaligned pointer value
*
* As the MAC address type is packed and therefore has alignment 1,
* we have to ensure that the pointer type we convert it to also
* has alignment 1, i.e., that it is also packed.
*/
struct Packed_uint16 { uint16_t value; } __attribute__((packed));
struct Packed_uint32 { uint32_t value; } __attribute__((packed));
class Phy_timeout_for_idle : public Genode::Exception {};
class Unkown_ethernet_speed : public Genode::Exception {};
@ -437,11 +451,11 @@ namespace Genode
Nic::Mac_address read_mac_address()
{
Nic::Mac_address mac;
uint32_t* const low_addr_pointer = reinterpret_cast<uint32_t*>(&mac.addr[0]);
uint16_t* const high_addr_pointer = reinterpret_cast<uint16_t*>(&mac.addr[4]);
Packed_uint32 * const low_addr_pointer = reinterpret_cast<Packed_uint32 *>(&mac.addr[0]);
Packed_uint16 * const high_addr_pointer = reinterpret_cast<Packed_uint16 *>(&mac.addr[4]);
*low_addr_pointer = read<Mac_addr_1::Low_addr>();
*high_addr_pointer = read<Mac_addr_1::High_addr>();
low_addr_pointer->value = read<Mac_addr_1::Low_addr>();
high_addr_pointer->value = read<Mac_addr_1::High_addr>();
return mac;
}
@ -676,11 +690,11 @@ namespace Genode
void write_mac_address(const Nic::Mac_address &mac)
{
const uint32_t* const low_addr_pointer = reinterpret_cast<const uint32_t*>(&mac.addr[0]);
const uint16_t* const high_addr_pointer = reinterpret_cast<const uint16_t*>(&mac.addr[4]);
Packed_uint32 const * const low_addr_pointer = reinterpret_cast<Packed_uint32 const *>(&mac.addr[0]);
Packed_uint16 const * const high_addr_pointer = reinterpret_cast<Packed_uint16 const *>(&mac.addr[4]);
write<Mac_addr_1::Low_addr>(*low_addr_pointer);
write<Mac_addr_1::High_addr>(*high_addr_pointer);
write<Mac_addr_1::Low_addr>(low_addr_pointer->value);
write<Mac_addr_1::High_addr>(high_addr_pointer->value);
}
void rx_buffer_reset_pkt(Nic::Packet_descriptor pkt)