* 64-bit Addresses in remote protocol @ 2021-03-22 16:55 Joel Sherrill 2021-03-22 17:32 ` Luis Machado 0 siblings, 1 reply; 4+ messages in thread From: Joel Sherrill @ 2021-03-22 16:55 UTC (permalink / raw) To: gdb Hi Over at RTEMS, we are looking at some warnings in our debug server and wondering if fields described as "addr" in the gdb protocol should be treated 64-bits when that target has 64-bit addresses like the aarch64. Technically, we are looking at sweeping through our gdb server and using uintptr_t for addresses where uint32_t has been ok before. But I wanted to make sure that our assumption that "addr" means a valid target address which means it can be 32- or 64- bits based on the target. Thanks. --joel RTEMS ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: 64-bit Addresses in remote protocol 2021-03-22 16:55 64-bit Addresses in remote protocol Joel Sherrill @ 2021-03-22 17:32 ` Luis Machado 2021-03-22 17:38 ` Joel Sherrill 0 siblings, 1 reply; 4+ messages in thread From: Luis Machado @ 2021-03-22 17:32 UTC (permalink / raw) To: joel, gdb Hi, On 3/22/21 1:55 PM, Joel Sherrill wrote: > Hi > > Over at RTEMS, we are looking at some warnings in our debug > server and wondering if fields described as "addr" in the gdb > protocol should be treated 64-bits when that target has 64-bit > addresses like the aarch64. If the inferior is using 64-bit addresses, then the remote protocol will also use 64-bit addresses. If we have a 32-bit inferior running on aarch64 hardware, we'll have 32-bit addresses over the remote protocol as well. Even when we're using 64-bit addresses, the remote protocol may not pad it with zeroes to make it 64-bit, but it should still be handled as 64-bit. Does that help? > > Technically, we are looking at sweeping through our gdb server > and using uintptr_t for addresses where uint32_t has been > ok before. > > But I wanted to make sure that our assumption that "addr" means > a valid target address which means it can be 32- or 64- bits based > on the target. > > Thanks. > > --joel > RTEMS > ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: 64-bit Addresses in remote protocol 2021-03-22 17:32 ` Luis Machado @ 2021-03-22 17:38 ` Joel Sherrill 2021-03-22 17:52 ` Luis Machado 0 siblings, 1 reply; 4+ messages in thread From: Joel Sherrill @ 2021-03-22 17:38 UTC (permalink / raw) To: Luis Machado; +Cc: gdb On Mon, Mar 22, 2021, 12:32 PM Luis Machado <luis.machado@linaro.org> wrote: > Hi, > > On 3/22/21 1:55 PM, Joel Sherrill wrote: > > Hi > > > > Over at RTEMS, we are looking at some warnings in our debug > > server and wondering if fields described as "addr" in the gdb > > protocol should be treated 64-bits when that target has 64-bit > > addresses like the aarch64. > > If the inferior is using 64-bit addresses, then the remote protocol will > also use 64-bit addresses. If we have a 32-bit inferior running on > aarch64 hardware, we'll have 32-bit addresses over the remote protocol > as well. > > Even when we're using 64-bit addresses, the remote protocol may not pad > it with zeroes to make it 64-bit, but it should still be handled as 64-bit. > > Does that help? > I think it does. Sounds right to treat it as uintptr_t when decoding it. Unfortunately I think this means a review of our gdb server since it uses a decode uint method a lot and each case will need to be checked to see if it is called for an address. Was there somewhere in the gdb documentation this was and I missed it? My read of the protocol description focused on it as an ASCII command and not the types they mapped to. But I admit that I might have missed something. Thanks. --joel > > > > Technically, we are looking at sweeping through our gdb server > > and using uintptr_t for addresses where uint32_t has been > > ok before. > > > > But I wanted to make sure that our assumption that "addr" means > > a valid target address which means it can be 32- or 64- bits based > > on the target. > > > > Thanks. > > > > --joel > > RTEMS > > > ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: 64-bit Addresses in remote protocol 2021-03-22 17:38 ` Joel Sherrill @ 2021-03-22 17:52 ` Luis Machado 0 siblings, 0 replies; 4+ messages in thread From: Luis Machado @ 2021-03-22 17:52 UTC (permalink / raw) To: joel; +Cc: gdb On 3/22/21 2:38 PM, Joel Sherrill wrote: > > > On Mon, Mar 22, 2021, 12:32 PM Luis Machado <luis.machado@linaro.org > <mailto:luis.machado@linaro.org>> wrote: > > Hi, > > On 3/22/21 1:55 PM, Joel Sherrill wrote: > > Hi > > > > Over at RTEMS, we are looking at some warnings in our debug > > server and wondering if fields described as "addr" in the gdb > > protocol should be treated 64-bits when that target has 64-bit > > addresses like the aarch64. > > If the inferior is using 64-bit addresses, then the remote protocol > will > also use 64-bit addresses. If we have a 32-bit inferior running on > aarch64 hardware, we'll have 32-bit addresses over the remote protocol > as well. > > Even when we're using 64-bit addresses, the remote protocol may not pad > it with zeroes to make it 64-bit, but it should still be handled as > 64-bit. > > Does that help? > > > I think it does. Sounds right to treat it as uintptr_t when decoding it. > > Unfortunately I think this means a review of our gdb server since it > uses a decode uint method a lot and each case will need to be checked to > see if it is called for an address. Can you switch to decoding 64-bit values by default and casting to 32-bit when necessary? > > Was there somewhere in the gdb documentation this was and I missed it? > My read of the protocol description focused on it as an ASCII command > and not the types they mapped to. But I admit that I might have missed > something. I don't think so. This is all more or less implicit and there doesn't seem to be any formal documentation about what "addr" in the remote protocol should look like. For example, there are packets that refer to "addr" as an address and nothing more. Some others, like 't', tell us something more: "There must be at least 3 digits in addr". So, unfortunately, there isn't a standard way addr should be formatted. But most of the uses match the inferior's address size. > > Thanks. > > --joel > > > > > > Technically, we are looking at sweeping through our gdb server > > and using uintptr_t for addresses where uint32_t has been > > ok before. > > > > But I wanted to make sure that our assumption that "addr" means > > a valid target address which means it can be 32- or 64- bits based > > on the target. > > > > Thanks. > > > > --joel > > RTEMS > > > ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2021-03-22 17:52 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2021-03-22 16:55 64-bit Addresses in remote protocol Joel Sherrill 2021-03-22 17:32 ` Luis Machado 2021-03-22 17:38 ` Joel Sherrill 2021-03-22 17:52 ` Luis Machado
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