Use relative path for bios

Look for bios and other support files relative to qemu binary, rather than
a hardcoded prefix.

Signed-off-by: Paul Brook <paul@codesourcery.com>

16 files changed, 366 insertions, 122 deletions

diff --git a/hw/mips_jazz.c b/hw/mips_jazz.c
index e496c2868..e683421d8 100644
--- a/hw/mips_jazz.c
+++ b/hw/mips_jazz.c
@@ -118,7 +118,7 @@ void mips_jazz_init (ram_addr_t ram_size,
                      const char *cpu_model,
                      enum jazz_model_e jazz_model)
 {
-    char buf[1024];
+    char *filename;
     int bios_size, n;
     CPUState *env;
     qemu_irq *rc4030, *i8259;
@@ -161,11 +161,17 @@ void mips_jazz_init (ram_addr_t ram_size,
     /* load the BIOS image. */
     if (bios_name == NULL)
         bios_name = BIOS_FILENAME;
-    snprintf(buf, sizeof(buf), "%s/%s", bios_dir, bios_name);
-    bios_size = load_image_targphys(buf, 0xfff00000LL, MAGNUM_BIOS_SIZE);
+    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
+    if (filename) {
+        bios_size = load_image_targphys(filename, 0xfff00000LL,
+                                        MAGNUM_BIOS_SIZE);
+        qemu_free(filename);
+    } else {
+        bios_size = -1;
+    }
     if (bios_size < 0 || bios_size > MAGNUM_BIOS_SIZE) {
         fprintf(stderr, "qemu: Could not load MIPS bios '%s'\n",
-                buf);
+                bios_name);
         exit(1);
     }
 
diff --git a/hw/mips_malta.c b/hw/mips_malta.c
index a30080863..970da4e60 100644
--- a/hw/mips_malta.c
+++ b/hw/mips_malta.c
@@ -758,7 +758,7 @@ void mips_malta_init (ram_addr_t ram_size,
                       const char *kernel_filename, const char *kernel_cmdline,
                       const char *initrd_filename, const char *cpu_model)
 {
-    char buf[1024];
+    char *filename;
     ram_addr_t ram_offset;
     ram_addr_t bios_offset;
     target_long bios_size;
@@ -846,12 +846,18 @@ void mips_malta_init (ram_addr_t ram_size,
             /* Load a BIOS image. */
             if (bios_name == NULL)
                 bios_name = BIOS_FILENAME;
-            snprintf(buf, sizeof(buf), "%s/%s", bios_dir, bios_name);
-            bios_size = load_image_targphys(buf, 0x1fc00000LL, BIOS_SIZE);
+            filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
+            if (filename) {
+                bios_size = load_image_targphys(filename, 0x1fc00000LL,
+                                                BIOS_SIZE);
+                qemu_free(filename);
+            } else {
+                bios_size = -1;
+            }
             if ((bios_size < 0 || bios_size > BIOS_SIZE) && !kernel_filename) {
                 fprintf(stderr,
                         "qemu: Could not load MIPS bios '%s', and no -kernel argument was specified\n",
-                        buf);
+                        bios_name);
                 exit(1);
             }
         }
diff --git a/hw/mips_mipssim.c b/hw/mips_mipssim.c
index 1117db27b..448dc02e4 100644
--- a/hw/mips_mipssim.c
+++ b/hw/mips_mipssim.c
@@ -107,7 +107,7 @@ mips_mipssim_init (ram_addr_t ram_size,
                    const char *kernel_filename, const char *kernel_cmdline,
                    const char *initrd_filename, const char *cpu_model)
 {
-    char buf[1024];
+    char *filename;
     ram_addr_t ram_offset;
     ram_addr_t bios_offset;
     CPUState *env;
@@ -140,13 +140,18 @@ mips_mipssim_init (ram_addr_t ram_size,
     /* Load a BIOS / boot exception handler image. */
     if (bios_name == NULL)
         bios_name = BIOS_FILENAME;
-    snprintf(buf, sizeof(buf), "%s/%s", bios_dir, bios_name);
-    bios_size = load_image_targphys(buf, 0x1fc00000LL, BIOS_SIZE);
+    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
+    if (filename) {
+        bios_size = load_image_targphys(filename, 0x1fc00000LL, BIOS_SIZE);
+        qemu_free(filename);
+    } else {
+        bios_size = -1;
+    }
     if ((bios_size < 0 || bios_size > BIOS_SIZE) && !kernel_filename) {
         /* Bail out if we have neither a kernel image nor boot vector code. */
         fprintf(stderr,
                 "qemu: Could not load MIPS bios '%s', and no -kernel argument was specified\n",
-                buf);
+                filename);
         exit(1);
     } else {
         /* We have a boot vector start address. */
diff --git a/hw/mips_r4k.c b/hw/mips_r4k.c
index ba8c7f61a..71832d576 100644
--- a/hw/mips_r4k.c
+++ b/hw/mips_r4k.c
@@ -147,7 +147,7 @@ void mips_r4k_init (ram_addr_t ram_size,
                     const char *kernel_filename, const char *kernel_cmdline,
                     const char *initrd_filename, const char *cpu_model)
 {
-    char buf[1024];
+    char *filename;
     ram_addr_t ram_offset;
     ram_addr_t bios_offset;
     int bios_size;
@@ -196,14 +196,18 @@ void mips_r4k_init (ram_addr_t ram_size,
        run. */
     if (bios_name == NULL)
         bios_name = BIOS_FILENAME;
-    snprintf(buf, sizeof(buf), "%s/%s", bios_dir, bios_name);
-    bios_size = get_image_size(buf);
+    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
+    if (filename) {
+        bios_size = get_image_size(filename);
+    } else {
+        bios_size = -1;
+    }
     if ((bios_size > 0) && (bios_size <= BIOS_SIZE)) {
         bios_offset = qemu_ram_alloc(BIOS_SIZE);
 	cpu_register_physical_memory(0x1fc00000, BIOS_SIZE,
                                      bios_offset | IO_MEM_ROM);
 
-        load_image_targphys(buf, 0x1fc00000, BIOS_SIZE);
+        load_image_targphys(filename, 0x1fc00000, BIOS_SIZE);
     } else if ((index = drive_get_index(IF_PFLASH, 0, 0)) > -1) {
         uint32_t mips_rom = 0x00400000;
         bios_offset = qemu_ram_alloc(mips_rom);
@@ -216,7 +220,10 @@ void mips_r4k_init (ram_addr_t ram_size,
     else {
 	/* not fatal */
         fprintf(stderr, "qemu: Warning, could not load MIPS bios '%s'\n",
-		buf);
+		bios_name);
+    }
+    if (filename) {
+        qemu_free(filename);
     }
 
     if (kernel_filename) {
diff --git a/hw/pc.c b/hw/pc.c
index 66cc780ef..0934778c7 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -603,10 +603,10 @@ static void load_linux(target_phys_addr_t option_rom,
     uint32_t gpr[8];
     uint16_t seg[6];
     uint16_t real_seg;
-    int setup_size, kernel_size, initrd_size, cmdline_size;
+    int setup_size, kernel_size, initrd_size = 0, cmdline_size;
     uint32_t initrd_max;
     uint8_t header[1024];
-    target_phys_addr_t real_addr, prot_addr, cmdline_addr, initrd_addr;
+    target_phys_addr_t real_addr, prot_addr, cmdline_addr, initrd_addr = 0;
     FILE *f, *fi;
 
     /* Align to 16 bytes as a paranoia measure */
@@ -805,14 +805,21 @@ static int load_option_rom(const char *oprom, target_phys_addr_t start,
                            target_phys_addr_t end)
 {
         int size;
-
-        size = get_image_size(oprom);
-        if (size > 0 && start + size > end) {
-            fprintf(stderr, "Not enough space to load option rom '%s'\n",
-                    oprom);
-            exit(1);
+        char *filename;
+
+        filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, oprom);
+        if (filename) {
+            size = get_image_size(filename);
+            if (size > 0 && start + size > end) {
+                fprintf(stderr, "Not enough space to load option rom '%s'\n",
+                        oprom);
+                exit(1);
+            }
+            size = load_image_targphys(filename, start, end - start);
+            qemu_free(filename);
+        } else {
+            size = -1;
         }
-        size = load_image_targphys(oprom, start, end - start);
         if (size < 0) {
             fprintf(stderr, "Could not load option rom '%s'\n", oprom);
             exit(1);
@@ -830,7 +837,7 @@ static void pc_init1(ram_addr_t ram_size,
                      const char *initrd_filename,
                      int pci_enabled, const char *cpu_model)
 {
-    char buf[1024];
+    char *filename;
     int ret, linux_boot, i;
     ram_addr_t ram_addr, bios_offset, option_rom_offset;
     ram_addr_t below_4g_mem_size, above_4g_mem_size = 0;
@@ -913,19 +920,26 @@ static void pc_init1(ram_addr_t ram_size,
     /* BIOS load */
     if (bios_name == NULL)
         bios_name = BIOS_FILENAME;
-    snprintf(buf, sizeof(buf), "%s/%s", bios_dir, bios_name);
-    bios_size = get_image_size(buf);
+    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
+    if (filename) {
+        bios_size = get_image_size(filename);
+    } else {
+        bios_size = -1;
+    }
     if (bios_size <= 0 ||
         (bios_size % 65536) != 0) {
         goto bios_error;
     }
     bios_offset = qemu_ram_alloc(bios_size);
-    ret = load_image(buf, qemu_get_ram_ptr(bios_offset));
+    ret = load_image(filename, qemu_get_ram_ptr(bios_offset));
     if (ret != bios_size) {
     bios_error:
-        fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", buf);
+        fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name);
         exit(1);
     }
+    if (filename) {
+        qemu_free(filename);
+    }
     /* map the last 128KB of the BIOS in ISA space */
     isa_bios_size = bios_size;
     if (isa_bios_size > (128 * 1024))
@@ -941,14 +955,14 @@ static void pc_init1(ram_addr_t ram_size,
     cpu_register_physical_memory(0xc0000, 0x20000, option_rom_offset);
 
     if (using_vga) {
+        const char *vgabios_filename;
         /* VGA BIOS load */
         if (cirrus_vga_enabled) {
-            snprintf(buf, sizeof(buf), "%s/%s", bios_dir,
-                     VGABIOS_CIRRUS_FILENAME);
+            vgabios_filename = VGABIOS_CIRRUS_FILENAME;
         } else {
-            snprintf(buf, sizeof(buf), "%s/%s", bios_dir, VGABIOS_FILENAME);
+            vgabios_filename = VGABIOS_FILENAME;
         }
-        oprom_area_size = load_option_rom(buf, 0xc0000, 0xe0000);
+        oprom_area_size = load_option_rom(vgabios_filename, 0xc0000, 0xe0000);
     }
     /* Although video roms can grow larger than 0x8000, the area between
      * 0xc0000 - 0xc8000 is reserved for them. It means we won't be looking
diff --git a/hw/ppc405_boards.c b/hw/ppc405_boards.c
index a8f9a2810..0dec1317e 100644
--- a/hw/ppc405_boards.c
+++ b/hw/ppc405_boards.c
@@ -175,7 +175,7 @@ static void ref405ep_init (ram_addr_t ram_size,
                            const char *initrd_filename,
                            const char *cpu_model)
 {
-    char buf[1024];
+    char *filename;
     ppc4xx_bd_info_t bd;
     CPUPPCState *env;
     qemu_irq *pic;
@@ -236,13 +236,19 @@ static void ref405ep_init (ram_addr_t ram_size,
 #ifdef DEBUG_BOARD_INIT
         printf("Load BIOS from file\n");
 #endif
+        bios_offset = qemu_ram_alloc(BIOS_SIZE);
         if (bios_name == NULL)
             bios_name = BIOS_FILENAME;
-        snprintf(buf, sizeof(buf), "%s/%s", bios_dir, bios_name);
-        bios_offset = qemu_ram_alloc(BIOS_SIZE);
-        bios_size = load_image(buf, qemu_get_ram_ptr(bios_offset));
+        filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
+        if (filename) {
+            bios_size = load_image(filename, qemu_get_ram_ptr(bios_offset));
+            qemu_free(filename);
+        } else {
+            bios_size = -1;
+        }
         if (bios_size < 0 || bios_size > BIOS_SIZE) {
-            fprintf(stderr, "qemu: could not load PowerPC bios '%s'\n", buf);
+            fprintf(stderr, "qemu: could not load PowerPC bios '%s'\n",
+                    bios_name);
             exit(1);
         }
         bios_size = (bios_size + 0xfff) & ~0xfff;
@@ -493,7 +499,7 @@ static void taihu_405ep_init(ram_addr_t ram_size,
                              const char *initrd_filename,
                              const char *cpu_model)
 {
-    char buf[1024];
+    char *filename;
     CPUPPCState *env;
     qemu_irq *pic;
     ram_addr_t bios_offset;
@@ -548,10 +554,15 @@ static void taihu_405ep_init(ram_addr_t ram_size,
         if (bios_name == NULL)
             bios_name = BIOS_FILENAME;
         bios_offset = qemu_ram_alloc(BIOS_SIZE);
-        snprintf(buf, sizeof(buf), "%s/%s", bios_dir, bios_name);
-        bios_size = load_image(buf, qemu_get_ram_ptr(bios_offset));
+        filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
+        if (filename) {
+            bios_size = load_image(filename, qemu_get_ram_ptr(bios_offset));
+        } else {
+            bios_size = -1;
+        }
         if (bios_size < 0 || bios_size > BIOS_SIZE) {
-            fprintf(stderr, "qemu: could not load PowerPC bios '%s'\n", buf);
+            fprintf(stderr, "qemu: could not load PowerPC bios '%s'\n",
+                    bios_name);
             exit(1);
         }
         bios_size = (bios_size + 0xfff) & ~0xfff;
diff --git a/hw/ppc440_bamboo.c b/hw/ppc440_bamboo.c
index cbe7236a4..00aa2c72a 100644
--- a/hw/ppc440_bamboo.c
+++ b/hw/ppc440_bamboo.c
@@ -34,20 +34,19 @@ static void *bamboo_load_device_tree(target_phys_addr_t addr,
     void *fdt = NULL;
 #ifdef HAVE_FDT
     uint32_t mem_reg_property[] = { 0, 0, ramsize };
-    char *path;
+    char *filename;
     int fdt_size;
-    int pathlen;
     int ret;
 
-    pathlen = snprintf(NULL, 0, "%s/%s", bios_dir, BINARY_DEVICE_TREE_FILE) + 1;
-    path = qemu_malloc(pathlen);
-
-    snprintf(path, pathlen, "%s/%s", bios_dir, BINARY_DEVICE_TREE_FILE);
-
-    fdt = load_device_tree(path, &fdt_size);
-    free(path);
-    if (fdt == NULL)
+    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, BINARY_DEVICE_TREE_FILE);
+    if (!filename) {
         goto out;
+    }
+    fdt = load_device_tree(filename, &fdt_size);
+    qemu_free(filename);
+    if (fdt == NULL) {
+        goto out;
+    }
 
     /* Manipulate device tree in memory. */
 
diff --git a/hw/ppc_newworld.c b/hw/ppc_newworld.c
index 88ad99db3..f0d167dbd 100644
--- a/hw/ppc_newworld.c
+++ b/hw/ppc_newworld.c
@@ -93,7 +93,7 @@ static void ppc_core99_init (ram_addr_t ram_size,
                              const char *cpu_model)
 {
     CPUState *env = NULL, *envs[MAX_CPUS];
-    char buf[1024];
+    char *filename;
     qemu_irq *pic, **openpic_irqs;
     int unin_memory;
     int linux_boot, i;
@@ -140,24 +140,35 @@ static void ppc_core99_init (ram_addr_t ram_size,
     bios_offset = qemu_ram_alloc(BIOS_SIZE);
     if (bios_name == NULL)
         bios_name = PROM_FILENAME;
-    snprintf(buf, sizeof(buf), "%s/%s", bios_dir, bios_name);
+    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
     cpu_register_physical_memory(PROM_ADDR, BIOS_SIZE, bios_offset | IO_MEM_ROM);
 
     /* Load OpenBIOS (ELF) */
-    bios_size = load_elf(buf, 0, NULL, NULL, NULL);
+    if (filename) {
+        bios_size = load_elf(filename, 0, NULL, NULL, NULL);
+        qemu_free(filename);
+    } else {
+        bios_size = -1;
+    }
     if (bios_size < 0 || bios_size > BIOS_SIZE) {
-        hw_error("qemu: could not load PowerPC bios '%s'\n", buf);
+        hw_error("qemu: could not load PowerPC bios '%s'\n", bios_name);
         exit(1);
     }
 
     /* allocate and load VGA BIOS */
     vga_bios_offset = qemu_ram_alloc(VGA_BIOS_SIZE);
     vga_bios_ptr = qemu_get_ram_ptr(vga_bios_offset);
-    snprintf(buf, sizeof(buf), "%s/%s", bios_dir, VGABIOS_FILENAME);
-    vga_bios_size = load_image(buf, vga_bios_ptr + 8);
+    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, VGABIOS_FILENAME);
+    if (filename) {
+        vga_bios_size = load_image(filename, vga_bios_ptr + 8);
+        qemu_free(filename);
+    } else {
+        vga_bios_size = -1;
+    }
     if (vga_bios_size < 0) {
         /* if no bios is present, we can still work */
-        fprintf(stderr, "qemu: warning: could not load VGA bios '%s'\n", buf);
+        fprintf(stderr, "qemu: warning: could not load VGA bios '%s'\n",
+                VGABIOS_FILENAME);
         vga_bios_size = 0;
     } else {
         /* set a specific header (XXX: find real Apple format for NDRV
diff --git a/hw/ppc_oldworld.c b/hw/ppc_oldworld.c
index aeac6aed3..b2c329b74 100644
--- a/hw/ppc_oldworld.c
+++ b/hw/ppc_oldworld.c
@@ -122,7 +122,7 @@ static void ppc_heathrow_init (ram_addr_t ram_size,
                                const char *cpu_model)
 {
     CPUState *env = NULL, *envs[MAX_CPUS];
-    char buf[1024];
+    char *filename;
     qemu_irq *pic, **heathrow_irqs;
     int linux_boot, i;
     ram_addr_t ram_offset, bios_offset, vga_bios_offset;
@@ -173,24 +173,35 @@ static void ppc_heathrow_init (ram_addr_t ram_size,
     bios_offset = qemu_ram_alloc(BIOS_SIZE);
     if (bios_name == NULL)
         bios_name = PROM_FILENAME;
-    snprintf(buf, sizeof(buf), "%s/%s", bios_dir, bios_name);
+    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
     cpu_register_physical_memory(PROM_ADDR, BIOS_SIZE, bios_offset | IO_MEM_ROM);
 
     /* Load OpenBIOS (ELF) */
-    bios_size = load_elf(buf, 0, NULL, NULL, NULL);
+    if (filename) {
+        bios_size = load_elf(filename, 0, NULL, NULL, NULL);
+        qemu_free(filename);
+    } else {
+        bios_size = -1;
+    }
     if (bios_size < 0 || bios_size > BIOS_SIZE) {
-        hw_error("qemu: could not load PowerPC bios '%s'\n", buf);
+        hw_error("qemu: could not load PowerPC bios '%s'\n", bios_name);
         exit(1);
     }
 
     /* allocate and load VGA BIOS */
     vga_bios_offset = qemu_ram_alloc(VGA_BIOS_SIZE);
     vga_bios_ptr = qemu_get_ram_ptr(vga_bios_offset);
-    snprintf(buf, sizeof(buf), "%s/%s", bios_dir, VGABIOS_FILENAME);
-    vga_bios_size = load_image(buf, vga_bios_ptr + 8);
+    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, VGABIOS_FILENAME);
+    if (filename) {
+        vga_bios_size = load_image(filename, vga_bios_ptr + 8);
+        qemu_free(filename);
+    } else {
+        vga_bios_size = -1;
+    }
     if (vga_bios_size < 0) {
         /* if no bios is present, we can still work */
-        fprintf(stderr, "qemu: warning: could not load VGA bios '%s'\n", buf);
+        fprintf(stderr, "qemu: warning: could not load VGA bios '%s'\n",
+                VGABIOS_FILENAME);
         vga_bios_size = 0;
     } else {
         /* set a specific header (XXX: find real Apple format for NDRV
diff --git a/hw/ppc_prep.c b/hw/ppc_prep.c
index 48321073f..2d308f3cc 100644
--- a/hw/ppc_prep.c
+++ b/hw/ppc_prep.c
@@ -539,7 +539,7 @@ static void ppc_prep_init (ram_addr_t ram_size,
                            const char *cpu_model)
 {
     CPUState *env = NULL, *envs[MAX_CPUS];
-    char buf[1024];
+    char *filename;
     nvram_t nvram;
     m48t59_t *m48t59;
     int PPC_io_memory;
@@ -585,18 +585,25 @@ static void ppc_prep_init (ram_addr_t ram_size,
     bios_offset = qemu_ram_alloc(BIOS_SIZE);
     if (bios_name == NULL)
         bios_name = BIOS_FILENAME;
-    snprintf(buf, sizeof(buf), "%s/%s", bios_dir, bios_name);
-    bios_size = get_image_size(buf);
+    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
+    if (filename) {
+        bios_size = get_image_size(filename);
+    } else {
+        bios_size = -1;
+    }
     if (bios_size > 0 && bios_size <= BIOS_SIZE) {
         target_phys_addr_t bios_addr;
         bios_size = (bios_size + 0xfff) & ~0xfff;
         bios_addr = (uint32_t)(-bios_size);
         cpu_register_physical_memory(bios_addr, bios_size,
                                      bios_offset | IO_MEM_ROM);
-        bios_size = load_image_targphys(buf, bios_addr, bios_size);
+        bios_size = load_image_targphys(filename, bios_addr, bios_size);
     }
     if (bios_size < 0 || bios_size > BIOS_SIZE) {
-        hw_error("qemu: could not load PPC PREP bios '%s'\n", buf);
+        hw_error("qemu: could not load PPC PREP bios '%s'\n", bios_name);
+    }
+    if (filename) {
+        qemu_free(filename);
     }
     if (env->nip < 0xFFF80000 && bios_size < 0x00100000) {
         hw_error("PowerPC 601 / 620 / 970 need a 1MB BIOS\n");
diff --git a/hw/ppce500_mpc8544ds.c b/hw/ppce500_mpc8544ds.c
index 632fb05ad..d9ed36ca5 100644
--- a/hw/ppce500_mpc8544ds.c
+++ b/hw/ppce500_mpc8544ds.c
@@ -79,20 +79,19 @@ static void *mpc8544_load_device_tree(target_phys_addr_t addr,
     void *fdt = NULL;
 #ifdef HAVE_FDT
     uint32_t mem_reg_property[] = {0, ramsize};
-    char *path;
+    char *filename;
     int fdt_size;
-    int pathlen;
     int ret;
 
-    pathlen = snprintf(NULL, 0, "%s/%s", bios_dir, BINARY_DEVICE_TREE_FILE) + 1;
-    path = qemu_malloc(pathlen);
-
-    snprintf(path, pathlen, "%s/%s", bios_dir, BINARY_DEVICE_TREE_FILE);
-
-    fdt = load_device_tree(path, &fdt_size);
-    qemu_free(path);
-    if (fdt == NULL)
+    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, BINARY_DEVICE_TREE_FILE);
+    if (!filename) {
         goto out;
+    }
+    fdt = load_device_tree(filename, &fdt_size);
+    qemu_free(filename);
+    if (fdt == NULL) {
+        goto out;
+    }
 
     /* Manipulate device tree in memory. */
     ret = qemu_devtree_setprop(fdt, "/memory", "reg", mem_reg_property,
diff --git a/hw/sun4m.c b/hw/sun4m.c
index 4ba9e89ed..ef9fa5e0b 100644
--- a/hw/sun4m.c
+++ b/hw/sun4m.c
@@ -400,7 +400,7 @@ static void sun4m_hw_init(const struct sun4m_hwdef *hwdef, ram_addr_t RAM_size,
     ram_addr_t ram_offset, prom_offset, idreg_offset;
     unsigned long kernel_size;
     int ret;
-    char buf[1024];
+    char *filename;
     BlockDriverState *fd[MAX_FD];
     int drive_index;
     void *fw_cfg;
@@ -451,13 +451,20 @@ static void sun4m_hw_init(const struct sun4m_hwdef *hwdef, ram_addr_t RAM_size,
 
     if (bios_name == NULL)
         bios_name = PROM_FILENAME;
-    snprintf(buf, sizeof(buf), "%s/%s", bios_dir, bios_name);
-    ret = load_elf(buf, hwdef->slavio_base - PROM_VADDR, NULL, NULL, NULL);
-    if (ret < 0 || ret > PROM_SIZE_MAX)
-        ret = load_image_targphys(buf, hwdef->slavio_base, PROM_SIZE_MAX);
+    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
+    if (filename) {
+        ret = load_elf(filename, hwdef->slavio_base - PROM_VADDR,
+                       NULL, NULL, NULL);
+        if (ret < 0 || ret > PROM_SIZE_MAX)
+            ret = load_image_targphys(filename, hwdef->slavio_base,
+                                      PROM_SIZE_MAX);
+        qemu_free(filename);
+    } else {
+        ret = -1;
+    }
     if (ret < 0 || ret > PROM_SIZE_MAX) {
         fprintf(stderr, "qemu: could not load prom '%s'\n",
-                buf);
+                bios_name);
         exit(1);
     }
 
@@ -1185,7 +1192,7 @@ static void sun4d_hw_init(const struct sun4d_hwdef *hwdef, ram_addr_t RAM_size,
     ram_addr_t ram_offset, prom_offset;
     unsigned long kernel_size;
     int ret;
-    char buf[1024];
+    char *filename;
     void *fw_cfg;
 
     /* init CPUs */
@@ -1233,13 +1240,20 @@ static void sun4d_hw_init(const struct sun4d_hwdef *hwdef, ram_addr_t RAM_size,
 
     if (bios_name == NULL)
         bios_name = PROM_FILENAME;
-    snprintf(buf, sizeof(buf), "%s/%s", bios_dir, bios_name);
-    ret = load_elf(buf, hwdef->slavio_base - PROM_VADDR, NULL, NULL, NULL);
-    if (ret < 0 || ret > PROM_SIZE_MAX)
-        ret = load_image_targphys(buf, hwdef->slavio_base, PROM_SIZE_MAX);
+    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
+    if (filename) {
+        ret = load_elf(filename, hwdef->slavio_base - PROM_VADDR,
+                       NULL, NULL, NULL);
+        if (ret < 0 || ret > PROM_SIZE_MAX)
+            ret = load_image_targphys(filename, hwdef->slavio_base,
+                                      PROM_SIZE_MAX);
+        qemu_free(filename);
+    } else {
+        ret = -1;
+    }
     if (ret < 0 || ret > PROM_SIZE_MAX) {
         fprintf(stderr, "qemu: could not load prom '%s'\n",
-                buf);
+                bios_name);
         exit(1);
     }
 
@@ -1399,7 +1413,7 @@ static void sun4c_hw_init(const struct sun4c_hwdef *hwdef, ram_addr_t RAM_size,
     ram_addr_t ram_offset, prom_offset;
     unsigned long kernel_size;
     int ret;
-    char buf[1024];
+    char *filename;
     BlockDriverState *fd[MAX_FD];
     int drive_index;
     void *fw_cfg;
@@ -1440,13 +1454,20 @@ static void sun4c_hw_init(const struct sun4c_hwdef *hwdef, ram_addr_t RAM_size,
 
     if (bios_name == NULL)
         bios_name = PROM_FILENAME;
-    snprintf(buf, sizeof(buf), "%s/%s", bios_dir, bios_name);
-    ret = load_elf(buf, hwdef->slavio_base - PROM_VADDR, NULL, NULL, NULL);
-    if (ret < 0 || ret > PROM_SIZE_MAX)
-        ret = load_image_targphys(buf, hwdef->slavio_base, PROM_SIZE_MAX);
+    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
+    if (filename) {
+        ret = load_elf(filename, hwdef->slavio_base - PROM_VADDR,
+                       NULL, NULL, NULL);
+        if (ret < 0 || ret > PROM_SIZE_MAX)
+            ret = load_image_targphys(filename, hwdef->slavio_base,
+                                      PROM_SIZE_MAX);
+        qemu_free(filename);
+    } else {
+        ret = -1;
+    }
     if (ret < 0 || ret > PROM_SIZE_MAX) {
         fprintf(stderr, "qemu: could not load prom '%s'\n",
-                buf);
+                filename);
         exit(1);
     }
 
diff --git a/hw/sun4u.c b/hw/sun4u.c
index f5bb7322c..7d020182f 100644
--- a/hw/sun4u.c
+++ b/hw/sun4u.c
@@ -333,7 +333,7 @@ static void sun4uv_init(ram_addr_t RAM_size,
                         const struct hwdef *hwdef)
 {
     CPUState *env;
-    char buf[1024];
+    char *filename;
     m48t59_t *nvram;
     int ret, linux_boot;
     unsigned int i;
@@ -392,17 +392,23 @@ static void sun4uv_init(ram_addr_t RAM_size,
 
     if (bios_name == NULL)
         bios_name = PROM_FILENAME;
-    snprintf(buf, sizeof(buf), "%s/%s", bios_dir, bios_name);
-    ret = load_elf(buf, hwdef->prom_addr - PROM_VADDR, NULL, NULL, NULL);
-    if (ret < 0) {
-        ret = load_image_targphys(buf, hwdef->prom_addr,
-                                  (PROM_SIZE_MAX + TARGET_PAGE_SIZE) &
-                                  TARGET_PAGE_MASK);
+    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
+    if (filename) {
+        ret = load_elf(filename, hwdef->prom_addr - PROM_VADDR,
+                       NULL, NULL, NULL);
         if (ret < 0) {
-            fprintf(stderr, "qemu: could not load prom '%s'\n",
-                    buf);
-            exit(1);
+            ret = load_image_targphys(filename, hwdef->prom_addr,
+                                      (PROM_SIZE_MAX + TARGET_PAGE_SIZE) &
+                                  TARGET_PAGE_MASK);
         }
+        qemu_free(filename);
+    } else {
+        ret = -1;
+    }
+    if (ret < 0) {
+        fprintf(stderr, "qemu: could not load prom '%s'\n",
+                bios_name);
+        exit(1);
     }
 
     kernel_size = 0;
diff --git a/keymaps.c b/keymaps.c
index 3b86dc15e..23db4a0bd 100644
--- a/keymaps.c
+++ b/keymaps.c
@@ -64,20 +64,20 @@ static kbd_layout_t *parse_keyboard_layout(const name2keysym_t *table,
 					   kbd_layout_t * k)
 {
     FILE *f;
-    char file_name[1024];
+    char * filename;
     char line[1024];
     int len;
 
-    snprintf(file_name, sizeof(file_name),
-             "%s/keymaps/%s", bios_dir, language);
+    filename = qemu_find_file(QEMU_FILE_TYPE_KEYMAP, language);
 
     if (!k)
 	k = qemu_mallocz(sizeof(kbd_layout_t));
-    if (!(f = fopen(file_name, "r"))) {
+    if (!(filename && (f = fopen(filename, "r")))) {
 	fprintf(stderr,
-		"Could not read keymap file: '%s'\n", file_name);
+		"Could not read keymap file: '%s'\n", language);
 	return 0;
     }
+    qemu_free(filename);
     for(;;) {
 	if (fgets(line, 1024, f) == NULL)
             break;
diff --git a/sysemu.h b/sysemu.h
index 92501edce..658aeec0b 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -10,7 +10,10 @@
 
 /* vl.c */
 extern const char *bios_name;
-extern const char *bios_dir;
+
+#define QEMU_FILE_TYPE_BIOS   0
+#define QEMU_FILE_TYPE_KEYMAP 1
+char *qemu_find_file(int type, const char *name);
 
 extern int vm_running;
 extern const char *qemu_name;
diff --git a/vl.c b/vl.c
index f8c0d00f6..fcf853222 100644
--- a/vl.c
+++ b/vl.c
@@ -33,6 +33,7 @@
 #include "config-host.h"
 
 #ifndef _WIN32
+#include <libgen.h>
 #include <pwd.h>
 #include <sys/times.h>
 #include <sys/wait.h>
@@ -191,7 +192,7 @@ int main(int argc, char **argv)
 /* XXX: use a two level table to limit memory usage */
 #define MAX_IOPORTS 65536
 
-const char *bios_dir = CONFIG_QEMU_SHAREDIR;
+static const char *data_dir;
 const char *bios_name = NULL;
 static void *ioport_opaque[MAX_IOPORTS];
 static IOPortReadFunc *ioport_read_table[3][MAX_IOPORTS];
@@ -4795,6 +4796,128 @@ static void termsig_setup(void)
 
 #endif
 
+#ifdef _WIN32
+/* Look for support files in the same directory as the executable.  */
+static char *find_datadir(const char *argv0)
+{
+    char *p;
+    char buf[MAX_PATH];
+    DWORD len;
+
+    len = GetModuleFileName(NULL, buf, sizeof(buf) - 1);
+    if (len == 0) {
+        return len;
+    }
+
+    buf[len] = 0;
+    p = buf + len - 1;
+    while (p != buf && *p != '\\')
+        p--;
+    *p = 0;
+    if (access(buf, R_OK) == 0) {
+        return qemu_strdup(buf);
+    }
+    return NULL;
+}
+#else /* !_WIN32 */
+
+/* Find a likely location for support files using the location of the binary.
+   For installed binaries this will be "$bindir/../share/qemu".  When
+   running from the build tree this will be "$bindir/../pc-bios".  */
+#define SHARE_SUFFIX "/share/qemu"
+#define BUILD_SUFFIX "/pc-bios"
+static char *find_datadir(const char *argv0)
+{
+    char *dir;
+    char *p = NULL;
+    char *res;
+#ifdef PATH_MAX
+    char buf[PATH_MAX];
+#endif
+
+#if defined(__linux__)
+    {
+        int len;
+        len = readlink("/proc/self/exe", buf, sizeof(buf) - 1);
+        if (len > 0) {
+            buf[len] = 0;
+            p = buf;
+        }
+    }
+#elif defined(__FreeBSD__)
+    {
+        int len;
+        len = readlink("/proc/curproc/file", buf, sizeof(buf) - 1);
+        if (len > 0) {
+            buf[len] = 0;
+            p = buf;
+        }
+    }
+#endif
+    /* If we don't have any way of figuring out the actual executable
+       location then try argv[0].  */
+    if (!p) {
+#ifdef PATH_MAX
+        p = buf;
+#endif
+        p = realpath(argv0, p);
+        if (!p) {
+            return NULL;
+        }
+    }
+    dir = dirname(p);
+    dir = dirname(dir);
+
+    res = qemu_mallocz(strlen(dir) + 
+        MAX(strlen(SHARE_SUFFIX), strlen(BUILD_SUFFIX)) + 1);
+    sprintf(res, "%s%s", dir, SHARE_SUFFIX);
+    if (access(res, R_OK)) {
+        sprintf(res, "%s%s", dir, BUILD_SUFFIX);
+        if (access(res, R_OK)) {
+            qemu_free(res);
+            res = NULL;
+        }
+    }
+#ifndef PATH_MAX
+    free(p);
+#endif
+    return res;
+}
+#undef SHARE_SUFFIX
+#undef BUILD_SUFFIX
+#endif
+
+char *qemu_find_file(int type, const char *name)
+{
+    int len;
+    const char *subdir;
+    char *buf;
+
+    /* If name contains path separators then try it as a straight path.  */
+    if ((strchr(name, '/') || strchr(name, '\\'))
+        && access(name, R_OK) == 0) {
+        return strdup(name);
+    }
+    switch (type) {
+    case QEMU_FILE_TYPE_BIOS:
+        subdir = "";
+        break;
+    case QEMU_FILE_TYPE_KEYMAP:
+        subdir = "keymaps/";
+        break;
+    default:
+        abort();
+    }
+    len = strlen(data_dir) + strlen(name) + strlen(subdir) + 2;
+    buf = qemu_mallocz(len);
+    sprintf(buf, "%s/%s%s", data_dir, subdir, name);
+    if (access(buf, R_OK)) {
+        qemu_free(buf);
+        return NULL;
+    }
+    return buf;
+}
+
 int main(int argc, char **argv, char **envp)
 {
     const char *gdbstub_dev = NULL;
@@ -5234,7 +5357,7 @@ int main(int argc, char **argv, char **envp)
                 gdbstub_dev = optarg;
                 break;
             case QEMU_OPTION_L:
-                bios_dir = optarg;
+                data_dir = optarg;
                 break;
             case QEMU_OPTION_bios:
                 bios_name = optarg;
@@ -5560,6 +5683,16 @@ int main(int argc, char **argv, char **envp)
         }
     }
 
+    /* If no data_dir is specified then try to find it relative to the
+       executable path.  */
+    if (!data_dir) {
+        data_dir = find_datadir(argv[0]);
+    }
+    /* If all else fails use the install patch specified when building.  */
+    if (!data_dir) {
+        data_dir = CONFIG_QEMU_SHAREDIR;
+    }
+
 #if defined(CONFIG_KVM) && defined(CONFIG_KQEMU)
     if (kvm_allowed && kqemu_allowed) {
         fprintf(stderr,
@@ -5705,19 +5838,24 @@ int main(int argc, char **argv, char **envp)
 	for (i = 0; i < nb_nics && i < 4; i++) {
 	    const char *model = nd_table[i].model;
 	    char buf[1024];
+            char *filename;
             if (net_boot & (1 << i)) {
                 if (model == NULL)
                     model = "ne2k_pci";
-                snprintf(buf, sizeof(buf), "%s/pxe-%s.bin", bios_dir, model);
-                if (get_image_size(buf) > 0) {
+                snprintf(buf, sizeof(buf), "pxe-%s.bin", model);
+                filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, buf);
+                if (filename && get_image_size(filename) > 0) {
                     if (nb_option_roms >= MAX_OPTION_ROMS) {
                         fprintf(stderr, "Too many option ROMs\n");
                         exit(1);
                     }
-                    option_rom[nb_option_roms] = strdup(buf);
+                    option_rom[nb_option_roms] = qemu_strdup(buf);
                     nb_option_roms++;
                     netroms++;
                 }
+                if (filename) {
+                    qemu_free(filename);
+                }
             }
 	}
 	if (netroms == 0) {