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authorRichard Henderson <richard.henderson@linaro.org>2019-12-17 13:31:13 -1000
committerRichard Henderson <richard.henderson@linaro.org>2020-03-28 14:09:44 -0700
commit64547a3bb6c92781372994e4e9b25a89f6c88074 (patch)
tree801a5ad5132dcab5bdc4db2f5c9e60760a750056 /accel
parentee5195ee0fc87858088313f2c6f327ac41f5912f (diff)
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tcg: Remove softmmu code_gen_buffer fixed address
The commentary talks about "in concert with the addresses assigned in the relevant linker script", except there is no linker script for softmmu, nor has there been for some time. (Do not confuse the user-only linker script editing that was removed in the previous patch, because user-only does not use this code_gen_buffer allocation method.) Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'accel')
-rw-r--r--accel/tcg/translate-all.c37
1 files changed, 5 insertions, 32 deletions
diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c
index 7891415..9924e66 100644
--- a/accel/tcg/translate-all.c
+++ b/accel/tcg/translate-all.c
@@ -1043,47 +1043,20 @@ static inline void *alloc_code_gen_buffer(void)
{
int prot = PROT_WRITE | PROT_READ | PROT_EXEC;
int flags = MAP_PRIVATE | MAP_ANONYMOUS;
- uintptr_t start = 0;
size_t size = tcg_ctx->code_gen_buffer_size;
void *buf;
- /* Constrain the position of the buffer based on the host cpu.
- Note that these addresses are chosen in concert with the
- addresses assigned in the relevant linker script file. */
-# if defined(__PIE__) || defined(__PIC__)
- /* Don't bother setting a preferred location if we're building
- a position-independent executable. We're more likely to get
- an address near the main executable if we let the kernel
- choose the address. */
-# elif defined(__x86_64__) && defined(MAP_32BIT)
- /* Force the memory down into low memory with the executable.
- Leave the choice of exact location with the kernel. */
- flags |= MAP_32BIT;
- /* Cannot expect to map more than 800MB in low memory. */
- if (size > 800u * 1024 * 1024) {
- tcg_ctx->code_gen_buffer_size = size = 800u * 1024 * 1024;
- }
-# elif defined(__sparc__)
- start = 0x40000000ul;
-# elif defined(__s390x__)
- start = 0x90000000ul;
-# elif defined(__mips__)
-# if _MIPS_SIM == _ABI64
- start = 0x128000000ul;
-# else
- start = 0x08000000ul;
-# endif
-# endif
-
- buf = mmap((void *)start, size, prot, flags, -1, 0);
+ buf = mmap(NULL, size, prot, flags, -1, 0);
if (buf == MAP_FAILED) {
return NULL;
}
#ifdef __mips__
if (cross_256mb(buf, size)) {
- /* Try again, with the original still mapped, to avoid re-acquiring
- that 256mb crossing. This time don't specify an address. */
+ /*
+ * Try again, with the original still mapped, to avoid re-acquiring
+ * the same 256mb crossing.
+ */
size_t size2;
void *buf2 = mmap(NULL, size, prot, flags, -1, 0);
switch ((int)(buf2 != MAP_FAILED)) {