diff options
Diffstat (limited to 'semihosting/arm-compat-semi.c')
| -rw-r--r-- | semihosting/arm-compat-semi.c | 124 |
1 files changed, 63 insertions, 61 deletions
diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c index 37963becae..7a51fd0737 100644 --- a/semihosting/arm-compat-semi.c +++ b/semihosting/arm-compat-semi.c @@ -44,6 +44,7 @@ #define COMMON_SEMI_HEAP_SIZE (128 * 1024 * 1024) #else #include "qemu/cutils.h" +#include "hw/loader.h" #ifdef TARGET_ARM #include "hw/arm/boot.h" #endif @@ -144,33 +145,69 @@ typedef struct GuestFD { static GArray *guestfd_array; #ifndef CONFIG_USER_ONLY -#include "exec/address-spaces.h" -/* - * Find the base of a RAM region containing the specified address + +/** + * common_semi_find_bases: find information about ram and heap base + * + * This function attempts to provide meaningful numbers for RAM and + * HEAP base addresses. The rambase is simply the lowest addressable + * RAM position. For the heapbase we ask the loader to scan the + * address space and the largest available gap by querying the "ROM" + * regions. + * + * Returns: a structure with the numbers we need. */ -static inline hwaddr -common_semi_find_region_base(hwaddr addr) + +typedef struct LayoutInfo { + target_ulong rambase; + size_t ramsize; + hwaddr heapbase; + hwaddr heaplimit; +} LayoutInfo; + +static bool find_ram_cb(Int128 start, Int128 len, const MemoryRegion *mr, + hwaddr offset_in_region, void *opaque) { - MemoryRegion *subregion; + LayoutInfo *info = (LayoutInfo *) opaque; + uint64_t size = int128_get64(len); + + if (!mr->ram || mr->readonly) { + return false; + } + + if (size > info->ramsize) { + info->rambase = int128_get64(start); + info->ramsize = size; + } + + /* search exhaustively for largest RAM */ + return false; +} + +static LayoutInfo common_semi_find_bases(CPUState *cs) +{ + FlatView *fv; + LayoutInfo info = { 0, 0, 0, 0 }; + + RCU_READ_LOCK_GUARD(); + + fv = address_space_to_flatview(cs->as); + flatview_for_each_range(fv, find_ram_cb, &info); /* - * Find the chunk of R/W memory containing the address. This is - * used for the SYS_HEAPINFO semihosting call, which should - * probably be using information from the loaded application. + * If we have found the RAM lets iterate through the ROM blobs to + * work out the best place for the remainder of RAM and split it + * equally between stack and heap. */ - QTAILQ_FOREACH(subregion, &get_system_memory()->subregions, - subregions_link) { - if (subregion->ram && !subregion->readonly) { - Int128 top128 = int128_add(int128_make64(subregion->addr), - subregion->size); - Int128 addr128 = int128_make64(addr); - if (subregion->addr <= addr && int128_lt(addr128, top128)) { - return subregion->addr; - } - } + if (info.rambase || info.ramsize > 0) { + RomGap gap = rom_find_largest_gap_between(info.rambase, info.ramsize); + info.heapbase = gap.base; + info.heaplimit = gap.base + gap.size; } - return 0; + + return info; } + #endif #ifdef TARGET_ARM @@ -204,28 +241,6 @@ common_semi_sys_exit_extended(CPUState *cs, int nr) return (nr == TARGET_SYS_EXIT_EXTENDED || is_a64(cs->env_ptr)); } -#ifndef CONFIG_USER_ONLY -#include "hw/arm/boot.h" -static inline target_ulong -common_semi_rambase(CPUState *cs) -{ - CPUArchState *env = cs->env_ptr; - const struct arm_boot_info *info = env->boot_info; - target_ulong sp; - - if (info) { - return info->loader_start; - } - - if (is_a64(env)) { - sp = env->xregs[31]; - } else { - sp = env->regs[13]; - } - return common_semi_find_region_base(sp); -} -#endif - #endif /* TARGET_ARM */ #ifdef TARGET_RISCV @@ -251,17 +266,6 @@ common_semi_sys_exit_extended(CPUState *cs, int nr) return (nr == TARGET_SYS_EXIT_EXTENDED || sizeof(target_ulong) == 8); } -#ifndef CONFIG_USER_ONLY - -static inline target_ulong -common_semi_rambase(CPUState *cs) -{ - RISCVCPU *cpu = RISCV_CPU(cs); - CPURISCVState *env = &cpu->env; - return common_semi_find_region_base(env->gpr[xSP]); -} -#endif - #endif /* @@ -1165,12 +1169,12 @@ target_ulong do_common_semihosting(CPUState *cs) case TARGET_SYS_HEAPINFO: { target_ulong retvals[4]; - target_ulong limit; int i; #ifdef CONFIG_USER_ONLY TaskState *ts = cs->opaque; + target_ulong limit; #else - target_ulong rambase = common_semi_rambase(cs); + LayoutInfo info = common_semi_find_bases(cs); #endif GET_ARG(0); @@ -1201,12 +1205,10 @@ target_ulong do_common_semihosting(CPUState *cs) retvals[2] = ts->stack_base; retvals[3] = 0; /* Stack limit. */ #else - limit = current_machine->ram_size; - /* TODO: Make this use the limit of the loaded application. */ - retvals[0] = rambase + limit / 2; - retvals[1] = rambase + limit; - retvals[2] = rambase + limit; /* Stack base */ - retvals[3] = rambase; /* Stack limit. */ + retvals[0] = info.heapbase; /* Heap Base */ + retvals[1] = info.heaplimit; /* Heap Limit */ + retvals[2] = info.heaplimit; /* Stack base */ + retvals[3] = info.heapbase; /* Stack limit. */ #endif for (i = 0; i < ARRAY_SIZE(retvals); i++) { |