diff options
Diffstat (limited to 'linux-user/arm/elfload.c')
| -rw-r--r-- | linux-user/arm/elfload.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/linux-user/arm/elfload.c b/linux-user/arm/elfload.c index f811c2f07a..1205687976 100644 --- a/linux-user/arm/elfload.c +++ b/linux-user/arm/elfload.c @@ -3,6 +3,8 @@ #include "qemu/osdep.h" #include "qemu.h" #include "loader.h" +#include "user-internals.h" +#include "target_elf.h" #include "target/arm/cpu-features.h" #include "target_elf.h" @@ -201,6 +203,50 @@ const char *get_elf_platform(CPUState *cs) #undef END } +bool init_guest_commpage(void) +{ + ARMCPU *cpu = ARM_CPU(thread_cpu); + int host_page_size = qemu_real_host_page_size(); + abi_ptr commpage; + void *want; + void *addr; + + /* + * M-profile allocates maximum of 2GB address space, so can never + * allocate the commpage. Skip it. + */ + if (arm_feature(&cpu->env, ARM_FEATURE_M)) { + return true; + } + + commpage = HI_COMMPAGE & -host_page_size; + want = g2h_untagged(commpage); + addr = mmap(want, host_page_size, PROT_READ | PROT_WRITE, + MAP_ANONYMOUS | MAP_PRIVATE | + (commpage < reserved_va ? MAP_FIXED : MAP_FIXED_NOREPLACE), + -1, 0); + + if (addr == MAP_FAILED) { + perror("Allocating guest commpage"); + exit(EXIT_FAILURE); + } + if (addr != want) { + return false; + } + + /* Set kernel helper versions; rest of page is 0. */ + __put_user(5, (uint32_t *)g2h_untagged(0xffff0ffcu)); + + if (mprotect(addr, host_page_size, PROT_READ)) { + perror("Protecting guest commpage"); + exit(EXIT_FAILURE); + } + + page_set_flags(commpage, commpage | (host_page_size - 1), + PAGE_READ | PAGE_EXEC | PAGE_VALID); + return true; +} + void elf_core_copy_regs(target_elf_gregset_t *r, const CPUARMState *env) { for (int i = 0; i < 16; ++i) { |