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| author | Richard Henderson <richard.henderson@linaro.org> | 2025-07-29 09:13:54 -1000 |
|---|---|---|
| committer | Richard Henderson <richard.henderson@linaro.org> | 2025-08-30 07:04:04 +1000 |
| commit | 6a91f64ee12fe54d1a9573e9ecbbae037b113097 (patch) | |
| tree | 00b2acf213b3fe82ac05b638a2e6524c6de17436 /linux-user/hppa | |
| parent | a56ef5e8454e42c0d263a97a1297ae67f4ce19cd (diff) | |
| download | qemu-6a91f64ee12fe54d1a9573e9ecbbae037b113097.zip qemu-6a91f64ee12fe54d1a9573e9ecbbae037b113097.tar.gz qemu-6a91f64ee12fe54d1a9573e9ecbbae037b113097.tar.bz2 | |
linux-user: Move init_guest_commpage to hppa/elfload.c
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'linux-user/hppa')
| -rw-r--r-- | linux-user/hppa/elfload.c | 31 | ||||
| -rw-r--r-- | linux-user/hppa/target_elf.h | 2 |
2 files changed, 33 insertions, 0 deletions
diff --git a/linux-user/hppa/elfload.c b/linux-user/hppa/elfload.c index 9dd3fe0..018034f 100644 --- a/linux-user/hppa/elfload.c +++ b/linux-user/hppa/elfload.c @@ -3,6 +3,7 @@ #include "qemu/osdep.h" #include "qemu.h" #include "loader.h" +#include "target_elf.h" const char *get_elf_cpu_model(uint32_t eflags) @@ -14,3 +15,33 @@ const char *get_elf_platform(CPUState *cs) { return "PARISC"; } + +bool init_guest_commpage(void) +{ + /* If reserved_va, then we have already mapped 0 page on the host. */ + if (!reserved_va) { + void *want, *addr; + + want = g2h_untagged(LO_COMMPAGE); + addr = mmap(want, TARGET_PAGE_SIZE, PROT_NONE, + MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED_NOREPLACE, -1, 0); + if (addr == MAP_FAILED) { + perror("Allocating guest commpage"); + exit(EXIT_FAILURE); + } + if (addr != want) { + return false; + } + } + + /* + * On Linux, page zero is normally marked execute only + gateway. + * Normal read or write is supposed to fail (thus PROT_NONE above), + * but specific offsets have kernel code mapped to raise permissions + * and implement syscalls. Here, simply mark the page executable. + * Special case the entry points during translation (see do_page_zero). + */ + page_set_flags(LO_COMMPAGE, LO_COMMPAGE | ~TARGET_PAGE_MASK, + PAGE_EXEC | PAGE_VALID); + return true; +} diff --git a/linux-user/hppa/target_elf.h b/linux-user/hppa/target_elf.h index 85be005..b654758 100644 --- a/linux-user/hppa/target_elf.h +++ b/linux-user/hppa/target_elf.h @@ -10,4 +10,6 @@ #define HAVE_ELF_PLATFORM 1 +#define LO_COMMPAGE 0 + #endif |