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729d2b16b7
GNU/Linux has historically had the following two resolver prototypes: 1. Elf_Addr(uint64_t, void *) 2. Elf_Addr(uint64_t, void *, void *) For the former, AT_HWCAP is passed in the first argument, and NULL in the second. For the latter, AT_HWCAP is still passed, and the second argument is a pointer to their home-grown __riscv_hwprobe function. Should they want to use the third argument in future, they'll have to introduce yet another prototype to allow for later expansion, and then all users will have to check whether the second argument is NULL to know if the third argument really exists. This is all rather silly and will surely prove fun in the face of type-checking CFI. Instead, be like arm64 and just define all 8 possible general purpose register arguments up front. To naive source code that forgets non-Linux OSes exist this will be compatible with prototype 1 above, since the second argument will be 0 and it won't look further (though should we start using the second argument for something that wouldn't be true any more and it might think it's __riscv_hwprobe, but that incompatibility is one we can defer committing to, and can choose to never adopt). Until the standard interface for querying extension information[1] is settled and implemented in FreeBSD there's not much you can do in a resolver other than use HWCAP_ISA_B, but this gets the infrastructure in place for when that day comes. [1] https://github.com/riscv-non-isa/riscv-c-api-doc/pull/74 Reviewed by: kib, mhorne MFC after: 1 month Differential Revision: https://reviews.freebsd.org/D46278 |
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| .. | ||
| atf | ||
| atrun | ||
| blacklistd-helper | ||
| bootpd | ||
| comsat | ||
| dma | ||
| fingerd | ||
| flua | ||
| ftpd | ||
| getty | ||
| hyperv | ||
| kgdb | ||
| mail.local | ||
| makewhatis.local | ||
| mknetid | ||
| nuageinit | ||
| phttpget | ||
| pppoed | ||
| rbootd | ||
| rc | ||
| revnetgroup | ||
| rpc.rquotad | ||
| rpc.rstatd | ||
| rpc.rusersd | ||
| rpc.rwalld | ||
| rpc.sprayd | ||
| rtld-elf | ||
| rtld-elf32 | ||
| save-entropy | ||
| smrsh | ||
| talkd | ||
| tcpd | ||
| tests | ||
| tftp-proxy | ||
| tftpd | ||
| ulog-helper | ||
| ypxfr | ||
| Makefile | ||
| Makefile.inc | ||