[question]about virtual adress convert

[luck71]

hello! i have a confusion about convert to va
why when enable long mode the current instruction address(rip register) still look like a physical address in gdb,

and untill these instructions be excuted, then all address show in gdb is virtual address

another question:

in long-mode(.code64), call __startup_64 still use pa 0x1000014 call 0x10001d0, while $1f is va movq $1f, %rax

at this moment, PG is already enabled, why call instruction still use pa 0x10001d0 (__startup_64)

or i make a mistake, 0x10001d0 is already a va, if so, how can i find corresponding pa by boot page table manually

[luohuang]

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[luck71]

1. this call is near call, address show in gdb is plused with $pc + instruction length
2. 0x10001d0 is a va, same as pa at this moment
3. movq $1f, %rax $1f is signed 32bit number, convert to signed 64 with fff padding